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Old 24-08-2003, 04:32 PM
Cereoid-UR12-
 
Posts: n/a
Default Apomictic Grasses

Name ten grasses in different genera that are apomictic!!!


Phred wrote in message
...
In article ,
"Cereoid-UR12-" wrote:
Monoculture is strictly for convenience.

Grasses need to have plants in close proximity because they are wind
pollinated.


Plenty are apomictic.

There is no "wild" maize. The wild relatives have no cob and are called
Teosinte.

nobody wrote in message
news
On Sat, 23 Aug 2003 12:18:43 +1000, "Frank Martin"
wrote:

Are some plants better planted in a group of their fellows than just

singly?
My grandmother says some plants are like flocks of birds and do better

in
a group. Does anyone know about this?

In order to produce good ears, corn must be planted pretty densely. As
I recall, you need to have at least three or four rows to get any ears
of corn. But, that is the way man has cultivated the plant... i dont
know if wild maize has similar population density requirements. But I
wouldnt doubt that wind pollinated plants need to have others nearby
in order to set seed.




Cheers, Phred.

--
LID



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Old 25-08-2003, 10:12 PM
Christopher Green
 
Posts: n/a
Default Apomictic Grasses

"Cereoid-UR12-" wrote in message m...
Name ten grasses in different genera that are apomictic!!!


Eragrostis, Chloris, Brachiaria, Cenchris, Panicum, Paspalum,
Pennisetum, Tripsacum, Hyparrhenia, Poa.

Many important forage grass species are obligate or facultative
apomicts.

--
Chris Green
  #3   Report Post  
Old 26-08-2003, 12:02 AM
Frank Martin
 
Posts: n/a
Default Apomictic Grasses

We await, breathlessly, the expected riposte from our brother-in-biology
Cereoid-UR12-.....!


"Christopher Green" wrote in message
om...
"Cereoid-UR12-" wrote in message

m...
Name ten grasses in different genera that are apomictic!!!


Eragrostis, Chloris, Brachiaria, Cenchris, Panicum, Paspalum,
Pennisetum, Tripsacum, Hyparrhenia, Poa.

Many important forage grass species are obligate or facultative
apomicts.

--
Chris Green



  #4   Report Post  
Old 26-08-2003, 01:22 AM
/\\/\\ichau
 
Posts: n/a
Default Apomictic Grasses

On 24 Aug 2003 16:27, "Cereoid-UR12-" wrote:
Name ten grasses in different genera that are apomictic!!!

Two of them:
Poa alpina L.
Festuca airoides Lam.

Both species produces apomictic varietes/forms in high mountains.
Regards,
--
/\/\ichal Smoczyk, msmoczykNOSPAM(at)wp.pl
===delete 'NOSPAM' from my address===

  #5   Report Post  
Old 26-08-2003, 04:22 AM
Cereoid-UR12-
 
Posts: n/a
Default Apomictic Grasses

Would have preferred that Phred answered the question himself instead of
your deliberate obfuscation.

Yes, those are genera of grasses but which actual species in those genera
are apomictic, if any?
A list of generic names alone tells us nothing.


Christopher Green wrote in message
om...
"Cereoid-UR12-" wrote in message

m...
Name ten grasses in different genera that are apomictic!!!


Eragrostis, Chloris, Brachiaria, Cenchris, Panicum, Paspalum,
Pennisetum, Tripsacum, Hyparrhenia, Poa.

Many important forage grass species are obligate or facultative
apomicts.

--
Chris Green





  #6   Report Post  
Old 26-08-2003, 04:34 AM
Cereoid-UR12-
 
Posts: n/a
Default Apomictic Grasses

Even though he did not answer the question, he did list the names of genera
of grasses.

Thats far more than you can do, Frankfurter!!!


Frank Martin wrote in message
...
We await, breathlessly, the expected riposte from our brother-in-biology
Cereoid-UR12-.....!


"Christopher Green" wrote in message
om...
"Cereoid-UR12-" wrote in message

m...
Name ten grasses in different genera that are apomictic!!!


Eragrostis, Chloris, Brachiaria, Cenchris, Panicum, Paspalum,
Pennisetum, Tripsacum, Hyparrhenia, Poa.

Many important forage grass species are obligate or facultative
apomicts.

--
Chris Green





  #7   Report Post  
Old 26-08-2003, 04:34 AM
Cereoid-UR12-
 
Posts: n/a
Default Apomictic Grasses

Finally, an actual answer from somebody that knows!!!!

Two down and eight to go!!!


/\/\ichau wrote in message
...
On 24 Aug 2003 16:27, "Cereoid-UR12-" wrote:
Name ten grasses in different genera that are apomictic!!!

Two of them:
Poa alpina L.
Festuca airoides Lam.

Both species produces apomictic varietes/forms in high mountains.
Regards,
--
/\/\ichal Smoczyk, msmoczykNOSPAM(at)wp.pl
===delete 'NOSPAM' from my address===



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Old 26-08-2003, 05:14 AM
mel turner
 
Posts: n/a
Default Apomictic Grasses

In article ,
[/\\/\\ichau] wrote...
On 24 Aug 2003 16:27, "Cereoid-UR12-" wrote:


Name ten grasses in different genera that are apomictic!!!


Sounds like fun, but why do you ask? Is this perhaps from
someone's homework assignment? [A "please" might work better
than the three exclamation points.]

Two of them:
Poa alpina L.
Festuca airoides Lam.

Both species produces apomictic varietes/forms in high mountains.


Okay, then that's two species and genera. Let's look for some more.

http://www.apomixis.de/back.htm:

"Apomictic processes have been observed in many plant species
and are most common in the Gramineae, Compositae and Rosaceae."

"But with the exception of Citrus, Malus and some forage grasses
like Poa and Panicum, apomixis is not very common in agriculturally
important crops (Koltunow, 1993)."

"New strategies and methods are now in progress to compare sexual
and apomictic varieties of grass species, like e.g. Poa, Paspalum
and Brachiaria, and to map the corresponding genes."

"Molecular tools have been developed to compare sexual and
apomictic ovaries in Pennisetum (Vielle-Calzada et al., 1996b)"

"In apomictic Tripsacum RFLP and PCR-RAPD markers co-segregating
with diplospory have been mapped to the same locus (Leblanc et al.,
1995b; Kindinger et al., 1996)"

http://www.hort.purdue.edu/newcrop/p...93/V2-294.html

"Buffelgrass, Cenchrus ciliaris L.
[...]
They are the product of plant breeding made possible by the
discovery of a sexual plant that could be crossed with apomictic
introductions and release their variability (Bashaw 1980)."

"Weeping lovegrass, Eragrostis curvula (Schrad.) Nees
[...]
It reproduces by obligate apomixis that has blocked genetic
improvement until recently."

Brachiaria decumbens Stapf.
Cenchrus ciliaris L.
Eragrostis curvula (Schrad.) Nees
Panicum maximum Jacq.

http://www.hort.purdue.edu/newcrop/p...90/v1-174.html:
"[...] and the obligate apomictic dallisgrass, Paspalum dilatatum
Poir. have not been improved."

"The tetraploid bahiagrasses, Paspalum notatum Flugge from South
America are obligate apomicts and breed true."

http://herbarium.usu.edu/Reports/publications.htm:
[...]"the apomictic Poa secunda Presl. complex"

[...]"apomictic Elymus rectisetus (Nees in Lehm.) A. Löve & Connor"

"Characterization of pseudogamy in an apomictic rice line."

http://tncweeds.ucdavis.edu/esadocs/...s/cortjub.html:
"Cortaderia jubata
[...]
There are populations of Cortaderia that consist entirely of
pistillate (female) plants that form seed without the necessity
of pollination (apomixis) (Costas Lippmann 1976)."

http://www.griffin.peachnet.edu/cssc...spalum/ref.htm:

"sexual diploid biotypes of two apomictic Paspalum species"

"A biosystemic study of selected facultative apomictic species of
Pennisetum"

http://www.botany.hawaii.edu/faculty...blications.htm:

"Morden, C. W. and S. L. Hatch. 1986. Vegetative apomixis in
Muhlenbergia repens (Poaceae: Eragrostideae). SIDA 11: 282-285"

How many genera is that so far? Eleven, I think. Let's try Biological
Abstracts for some mo

Apomixis in guineagrass (Panicum maximum Jacq.).
Wang-Yan; Xu-Qiu-sheng; Ye-Xiu-lin {a}
Journal-of-Tropical-and-Subtropical-Botany. [print] 2003; 11 (1):
83-86.

Influence of photoperiod on facultative apomixis in Apluda mutica.
Ma-San-mei; Wang-Yong-fei; Ye-Xiu-lin {a}; Zhao-Nan-xian;
Liang-Cheng-Ye
Journal-of-Tropical-and-Subtropical-Botany. [print] 2003; 11 (1):
64-66.

Sexual and apomictic seed development in the vulnerable grass
Bothriochloa biloba.
Yu-Ping {a}; Prakash-N; Whalley-R-D-B
Australian-Journal-of-Botany. [print] 2003; 51 (1): 75-84.

Once again: The correct name of the endemic Calamagrostis from
Saxony (Germany).
Raus-Th {a}; Scholz-H {a}
Feddes-Repertorium. [print] 2002; 113 (3-4): 271-272.

"[...]the correct species name of the apomictic Calamagrostis endemic
to Saxony, hitherto known as C. pseudopurpurea, is C. rivalis."

Reproductive ecology of a native Hawaiian grass (Heteropogon contortus;
Poaceae) versus its invasive alien competitor (Pennisetum setaceum;
Poaceae).
Goergen-Erin; Daehler-Curtis-C {a}
International-Journal-of-Plant-Sciences. [print] March, 2001; 162 (2):
317-326.

"Both species are drought-tolerant, perennial, C4 bunch-grasses that
rely on apomictic seeds for reproduction. "

The influence of fire on the demography of a dominant grass species
of West African savannas, Hyparrhenia diplandra.
Garnier-Lisa-K-M; Dajoz-Isabelle {a}
Journal-of-Ecology. [print] April, 2001; 89 (2): 200-208.

"differences between clones showed that growth rate also had a
genetic basis in this apomictic species."

Genetic variability and phytogeography of Miscanthus sinensis var.
condensatus, an apomictic grass, based on RAPD fingerprints.
Chou-Chang-Hung; Chiang-Yu-Chung; Chiang-Tzen-Yuh {a}
Canadian-Journal-of-Botany. [print] October, 2000; 78 (10): 1262-1268.

An apomictic autotriploid line TAR identified in Oryza sativa.
Liu-Yong-Sheng {a}; Sung-Jing-San; Hsu-Francis {a}
Acta-Botanica-Sinica. 1996; 38 (11) 917-920.

Embryological study on apomixis in a sorghum line SSA-1.
Wu-Shu-Biao {a}; Shang-Yong-Jin {a}; Han-Xue-Mei {a}; Wang-Jing-Xue
{a}; Niu-Tian-Tang; Zhang-Fu-Yao; Wei-Yao-Ming; Meng-Cue-Gang;
Yan-Xi-Mei; Zheng-Jing-Bo
Acta-Botanica-Sinica. 1994; 36 (11) 833-837.

Evolution of reproduction in Lamprothyrsus (Arundineae: Gramineae).
Connor-H-E {a}; Dawson-M-I
Annals-of-the-Missouri-Botanical-Garden. 1993; 80 (2) 513-517.
Lamprothyrsus, a ditypic arundinoid, South American grass genus,
consists predominantly of populations of exclusively female plants
in which seeds are set by autonomous apospory.

A cytogenetic study of a hexaploid Themeda triandra Forssk. population.
Fossey-Annabel; Liebenberg-H
South-African-Journal-of-Botany. 1992; 58 (4) 275-276.

"The data support the fact that the hexaploids are near
obligate apomicts."

Apomixis in the gramineae.
Ma-Guo-hua {a}; Zhao-Nan-xian {a}; Huang-Xue-lin
Journal-of-Tropical-and-Subtropical-Botany. [print] 2001; 9 (1):
83-92.
Gramineae is one of the largest families with widest distribution on
the globe. It contains most important crops in the world including
a great number of apomictic species. Apomixis has great potentialities
for utilization of crop hybrid vigor. However, apomixis as a
reproductive way of diversity in plant revolution is very comprehensive.
In this paper, the distribution of apomictic species in Gramineae is
reviewed. Advance in studies on apomixes in aspects of cytology,
genetics and molecular biology are also summarized.

The structure of agamocomplexes and the problem of saltatory
speciation in angiosperms.
Kashin-A-S
Botanicheskii-Zhurnal-St-Petersburg. Jan., 1999; 84 (1): 15-29.
Russian; Non-English
Summary: English; Russian

[among the organisms listed:
Bothriochloa- (Gramineae-); Calamagrostis- (Gramineae-); Dichanthium-
(Gramineae-);Poa- (Gramineae-)]

Okay, so far we've got about 19 - 20 or so grass genera with known
apomictic forms. I''ve no doubt there are plenty more.

cheers

  #9   Report Post  
Old 26-08-2003, 08:22 AM
PEHnews
 
Posts: n/a
Default Apomictic Grasses


"Christopher Green" skrev i en meddelelse
om...
"Cereoid-UR12-" wrote in message

m...
Name ten grasses in different genera that are apomictic!!!


Eragrostis, Chloris, Brachiaria, Cenchris, Panicum, Paspalum,
Pennisetum, Tripsacum, Hyparrhenia, Poa.

Many important forage grass species are obligate or facultative
apomicts.


Could you give som examples to species complexes compareable with i.e.
Rubus and former Potentilla argentea?

Poul Evald Hansen


  #10   Report Post  
Old 26-08-2003, 09:02 AM
Christopher Green
 
Posts: n/a
Default Apomictic Grasses

"Cereoid-UR12-" wrote in message m...
Would have preferred that Phred answered the question himself instead of
your deliberate obfuscation.

Yes, those are genera of grasses but which actual species in those genera
are apomictic, if any?
A list of generic names alone tells us nothing.


Look 'em up yourself. There are hundreds.

--
Chris Green


  #11   Report Post  
Old 26-08-2003, 04:03 PM
Cereoid-UR12-
 
Posts: n/a
Default Apomictic Grasses

No, its because Phred boldly proclaimed in this newsgroup that many grasses
are apomictic without giving any actual examples.

There are far too many bold platitudes that people make in the guise of
scientific fact that prove not to be true under closer examination. I wanted
the dude to give actual proof of what he claimed. So far, he has not
replied. I tend not to believe people who cannot back what they claim.

Michau generously provided two examples of apomictic grasses but that hardly
constitutes "many".

Thank you Mel for providing actual references and actual species names.

Phred and prissy Chris Green can eat your dust!!!


mel turner wrote in message
...
In article ,


[/\\/\\ichau] wrote...
On 24 Aug 2003 16:27, "Cereoid-UR12-" wrote:


Name ten grasses in different genera that are apomictic!!!


Sounds like fun, but why do you ask? Is this perhaps from
someone's homework assignment? [A "please" might work better
than the three exclamation points.]

Two of them:
Poa alpina L.
Festuca airoides Lam.

Both species produces apomictic varietes/forms in high mountains.


Okay, then that's two species and genera. Let's look for some more.

http://www.apomixis.de/back.htm:

"Apomictic processes have been observed in many plant species
and are most common in the Gramineae, Compositae and Rosaceae."

"But with the exception of Citrus, Malus and some forage grasses
like Poa and Panicum, apomixis is not very common in agriculturally
important crops (Koltunow, 1993)."

"New strategies and methods are now in progress to compare sexual
and apomictic varieties of grass species, like e.g. Poa, Paspalum
and Brachiaria, and to map the corresponding genes."

"Molecular tools have been developed to compare sexual and
apomictic ovaries in Pennisetum (Vielle-Calzada et al., 1996b)"

"In apomictic Tripsacum RFLP and PCR-RAPD markers co-segregating
with diplospory have been mapped to the same locus (Leblanc et al.,
1995b; Kindinger et al., 1996)"

http://www.hort.purdue.edu/newcrop/p...93/V2-294.html

"Buffelgrass, Cenchrus ciliaris L.
[...]
They are the product of plant breeding made possible by the
discovery of a sexual plant that could be crossed with apomictic
introductions and release their variability (Bashaw 1980)."

"Weeping lovegrass, Eragrostis curvula (Schrad.) Nees
[...]
It reproduces by obligate apomixis that has blocked genetic
improvement until recently."

Brachiaria decumbens Stapf.
Cenchrus ciliaris L.
Eragrostis curvula (Schrad.) Nees
Panicum maximum Jacq.

http://www.hort.purdue.edu/newcrop/p...90/v1-174.html:
"[...] and the obligate apomictic dallisgrass, Paspalum dilatatum
Poir. have not been improved."

"The tetraploid bahiagrasses, Paspalum notatum Flugge from South
America are obligate apomicts and breed true."

http://herbarium.usu.edu/Reports/publications.htm:
[...]"the apomictic Poa secunda Presl. complex"

[...]"apomictic Elymus rectisetus (Nees in Lehm.) A. Löve & Connor"

"Characterization of pseudogamy in an apomictic rice line."

http://tncweeds.ucdavis.edu/esadocs/...s/cortjub.html:
"Cortaderia jubata
[...]
There are populations of Cortaderia that consist entirely of
pistillate (female) plants that form seed without the necessity
of pollination (apomixis) (Costas Lippmann 1976)."

http://www.griffin.peachnet.edu/cssc...spalum/ref.htm:

"sexual diploid biotypes of two apomictic Paspalum species"

"A biosystemic study of selected facultative apomictic species of
Pennisetum"

http://www.botany.hawaii.edu/faculty...blications.htm:

"Morden, C. W. and S. L. Hatch. 1986. Vegetative apomixis in
Muhlenbergia repens (Poaceae: Eragrostideae). SIDA 11: 282-285"

How many genera is that so far? Eleven, I think. Let's try Biological
Abstracts for some mo

Apomixis in guineagrass (Panicum maximum Jacq.).
Wang-Yan; Xu-Qiu-sheng; Ye-Xiu-lin {a}
Journal-of-Tropical-and-Subtropical-Botany. [print] 2003; 11 (1):
83-86.

Influence of photoperiod on facultative apomixis in Apluda mutica.
Ma-San-mei; Wang-Yong-fei; Ye-Xiu-lin {a}; Zhao-Nan-xian;
Liang-Cheng-Ye
Journal-of-Tropical-and-Subtropical-Botany. [print] 2003; 11 (1):
64-66.

Sexual and apomictic seed development in the vulnerable grass
Bothriochloa biloba.
Yu-Ping {a}; Prakash-N; Whalley-R-D-B
Australian-Journal-of-Botany. [print] 2003; 51 (1): 75-84.

Once again: The correct name of the endemic Calamagrostis from
Saxony (Germany).
Raus-Th {a}; Scholz-H {a}
Feddes-Repertorium. [print] 2002; 113 (3-4): 271-272.

"[...]the correct species name of the apomictic Calamagrostis endemic
to Saxony, hitherto known as C. pseudopurpurea, is C. rivalis."

Reproductive ecology of a native Hawaiian grass (Heteropogon contortus;
Poaceae) versus its invasive alien competitor (Pennisetum setaceum;
Poaceae).
Goergen-Erin; Daehler-Curtis-C {a}
International-Journal-of-Plant-Sciences. [print] March, 2001; 162 (2):
317-326.

"Both species are drought-tolerant, perennial, C4 bunch-grasses that
rely on apomictic seeds for reproduction. "

The influence of fire on the demography of a dominant grass species
of West African savannas, Hyparrhenia diplandra.
Garnier-Lisa-K-M; Dajoz-Isabelle {a}
Journal-of-Ecology. [print] April, 2001; 89 (2): 200-208.

"differences between clones showed that growth rate also had a
genetic basis in this apomictic species."

Genetic variability and phytogeography of Miscanthus sinensis var.
condensatus, an apomictic grass, based on RAPD fingerprints.
Chou-Chang-Hung; Chiang-Yu-Chung; Chiang-Tzen-Yuh {a}
Canadian-Journal-of-Botany. [print] October, 2000; 78 (10): 1262-1268.

An apomictic autotriploid line TAR identified in Oryza sativa.
Liu-Yong-Sheng {a}; Sung-Jing-San; Hsu-Francis {a}
Acta-Botanica-Sinica. 1996; 38 (11) 917-920.

Embryological study on apomixis in a sorghum line SSA-1.
Wu-Shu-Biao {a}; Shang-Yong-Jin {a}; Han-Xue-Mei {a}; Wang-Jing-Xue
{a}; Niu-Tian-Tang; Zhang-Fu-Yao; Wei-Yao-Ming; Meng-Cue-Gang;
Yan-Xi-Mei; Zheng-Jing-Bo
Acta-Botanica-Sinica. 1994; 36 (11) 833-837.

Evolution of reproduction in Lamprothyrsus (Arundineae: Gramineae).
Connor-H-E {a}; Dawson-M-I
Annals-of-the-Missouri-Botanical-Garden. 1993; 80 (2) 513-517.
Lamprothyrsus, a ditypic arundinoid, South American grass genus,
consists predominantly of populations of exclusively female plants
in which seeds are set by autonomous apospory.

A cytogenetic study of a hexaploid Themeda triandra Forssk. population.
Fossey-Annabel; Liebenberg-H
South-African-Journal-of-Botany. 1992; 58 (4) 275-276.

"The data support the fact that the hexaploids are near
obligate apomicts."

Apomixis in the gramineae.
Ma-Guo-hua {a}; Zhao-Nan-xian {a}; Huang-Xue-lin
Journal-of-Tropical-and-Subtropical-Botany. [print] 2001; 9 (1):
83-92.
Gramineae is one of the largest families with widest distribution on
the globe. It contains most important crops in the world including
a great number of apomictic species. Apomixis has great potentialities
for utilization of crop hybrid vigor. However, apomixis as a
reproductive way of diversity in plant revolution is very comprehensive.
In this paper, the distribution of apomictic species in Gramineae is
reviewed. Advance in studies on apomixes in aspects of cytology,
genetics and molecular biology are also summarized.

The structure of agamocomplexes and the problem of saltatory
speciation in angiosperms.
Kashin-A-S
Botanicheskii-Zhurnal-St-Petersburg. Jan., 1999; 84 (1): 15-29.
Russian; Non-English
Summary: English; Russian

[among the organisms listed:
Bothriochloa- (Gramineae-); Calamagrostis- (Gramineae-); Dichanthium-
(Gramineae-);Poa- (Gramineae-)]

Okay, so far we've got about 19 - 20 or so grass genera with known
apomictic forms. I''ve no doubt there are plenty more.

cheers



  #12   Report Post  
Old 26-08-2003, 05:12 PM
Phred
 
Posts: n/a
Default Apomictic Grasses

In article ,
"Cereoid-UR12-" wrote:
Name ten grasses in different genera that are apomictic!!!


Here's a few you can look up... but I'm stuffed if I'm going to do
*all* your homework for you, so look up the details for yourself and
don't be a typical lazy student parasitising the web.

In no particular order: Brachiaria, Paspalum, Eragrostis, Poa,
Dichanthium, Tripsacum, Cenchrus, Pennisetum, Panicum, Hyparrhenia,
Vetiveria, Themeda, Heteropogon, Bouteloua, Bothriochloa,
Capillipedium... (And I suppose we could even throw in Zea now.)


Cheers, Phred.

--
LID

  #13   Report Post  
Old 26-08-2003, 09:12 PM
Cereoid-UR12-
 
Posts: n/a
Default Apomictic Grasses

I'm not a student, Buckwheat.

I just want you to put your money where you flip mouth is, you superficial
smartass.

You still haven't answered the question, you ******.

I asked for a list of SPECIES in ten different genera not just random list
of generic names.

Any idiot can randomly throw out the names of genera and you have proven
that.

Most if not all of the species in those genera ARE NOT APOMICTIC.

That makes you the lazy parasite who cannot back the outrageous statements
you make.


Phred wrote in message
...
In article ,
"Cereoid-UR12-" wrote:
Name ten grasses in different genera that are apomictic!!!


Here's a few you can look up... but I'm stuffed if I'm going to do
*all* your homework for you, so look up the details for yourself and
don't be a typical lazy student parasitising the web.

In no particular order: Brachiaria, Paspalum, Eragrostis, Poa,
Dichanthium, Tripsacum, Cenchrus, Pennisetum, Panicum, Hyparrhenia,
Vetiveria, Themeda, Heteropogon, Bouteloua, Bothriochloa,
Capillipedium... (And I suppose we could even throw in Zea now.)


Cheers, Phred.

--
LID



  #14   Report Post  
Old 27-08-2003, 12:02 AM
Frank Martin
 
Posts: n/a
Default Apomictic Grasses

( Yawn.....! )



"Cereoid-UR12-" wrote in message
m...
No, its because Phred boldly proclaimed in this newsgroup that many

grasses
are apomictic without giving any actual examples.

There are far too many bold platitudes that people make in the guise of
scientific fact that prove not to be true under closer examination. I

wanted
the dude to give actual proof of what he claimed. So far, he has not
replied. I tend not to believe people who cannot back what they claim.

Michau generously provided two examples of apomictic grasses but that

hardly
constitutes "many".

Thank you Mel for providing actual references and actual species names.

Phred and prissy Chris Green can eat your dust!!!


mel turner wrote in message
...
In article ,


[/\\/\\ichau] wrote...
On 24 Aug 2003 16:27, "Cereoid-UR12-" wrote:


Name ten grasses in different genera that are apomictic!!!


Sounds like fun, but why do you ask? Is this perhaps from
someone's homework assignment? [A "please" might work better
than the three exclamation points.]

Two of them:
Poa alpina L.
Festuca airoides Lam.

Both species produces apomictic varietes/forms in high mountains.


Okay, then that's two species and genera. Let's look for some more.

http://www.apomixis.de/back.htm:

"Apomictic processes have been observed in many plant species
and are most common in the Gramineae, Compositae and Rosaceae."

"But with the exception of Citrus, Malus and some forage grasses
like Poa and Panicum, apomixis is not very common in agriculturally
important crops (Koltunow, 1993)."

"New strategies and methods are now in progress to compare sexual
and apomictic varieties of grass species, like e.g. Poa, Paspalum
and Brachiaria, and to map the corresponding genes."

"Molecular tools have been developed to compare sexual and
apomictic ovaries in Pennisetum (Vielle-Calzada et al., 1996b)"

"In apomictic Tripsacum RFLP and PCR-RAPD markers co-segregating
with diplospory have been mapped to the same locus (Leblanc et al.,
1995b; Kindinger et al., 1996)"

http://www.hort.purdue.edu/newcrop/p...93/V2-294.html

"Buffelgrass, Cenchrus ciliaris L.
[...]
They are the product of plant breeding made possible by the
discovery of a sexual plant that could be crossed with apomictic
introductions and release their variability (Bashaw 1980)."

"Weeping lovegrass, Eragrostis curvula (Schrad.) Nees
[...]
It reproduces by obligate apomixis that has blocked genetic
improvement until recently."

Brachiaria decumbens Stapf.
Cenchrus ciliaris L.
Eragrostis curvula (Schrad.) Nees
Panicum maximum Jacq.

http://www.hort.purdue.edu/newcrop/p...90/v1-174.html:
"[...] and the obligate apomictic dallisgrass, Paspalum dilatatum
Poir. have not been improved."

"The tetraploid bahiagrasses, Paspalum notatum Flugge from South
America are obligate apomicts and breed true."

http://herbarium.usu.edu/Reports/publications.htm:
[...]"the apomictic Poa secunda Presl. complex"

[...]"apomictic Elymus rectisetus (Nees in Lehm.) A. Löve & Connor"

"Characterization of pseudogamy in an apomictic rice line."

http://tncweeds.ucdavis.edu/esadocs/...s/cortjub.html:
"Cortaderia jubata
[...]
There are populations of Cortaderia that consist entirely of
pistillate (female) plants that form seed without the necessity
of pollination (apomixis) (Costas Lippmann 1976)."

http://www.griffin.peachnet.edu/cssc...spalum/ref.htm:

"sexual diploid biotypes of two apomictic Paspalum species"

"A biosystemic study of selected facultative apomictic species of
Pennisetum"

http://www.botany.hawaii.edu/faculty...blications.htm:

"Morden, C. W. and S. L. Hatch. 1986. Vegetative apomixis in
Muhlenbergia repens (Poaceae: Eragrostideae). SIDA 11: 282-285"

How many genera is that so far? Eleven, I think. Let's try Biological
Abstracts for some mo

Apomixis in guineagrass (Panicum maximum Jacq.).
Wang-Yan; Xu-Qiu-sheng; Ye-Xiu-lin {a}
Journal-of-Tropical-and-Subtropical-Botany. [print] 2003; 11 (1):
83-86.

Influence of photoperiod on facultative apomixis in Apluda mutica.
Ma-San-mei; Wang-Yong-fei; Ye-Xiu-lin {a}; Zhao-Nan-xian;
Liang-Cheng-Ye
Journal-of-Tropical-and-Subtropical-Botany. [print] 2003; 11 (1):
64-66.

Sexual and apomictic seed development in the vulnerable grass
Bothriochloa biloba.
Yu-Ping {a}; Prakash-N; Whalley-R-D-B
Australian-Journal-of-Botany. [print] 2003; 51 (1): 75-84.

Once again: The correct name of the endemic Calamagrostis from
Saxony (Germany).
Raus-Th {a}; Scholz-H {a}
Feddes-Repertorium. [print] 2002; 113 (3-4): 271-272.

"[...]the correct species name of the apomictic Calamagrostis endemic
to Saxony, hitherto known as C. pseudopurpurea, is C. rivalis."

Reproductive ecology of a native Hawaiian grass (Heteropogon contortus;
Poaceae) versus its invasive alien competitor (Pennisetum setaceum;
Poaceae).
Goergen-Erin; Daehler-Curtis-C {a}
International-Journal-of-Plant-Sciences. [print] March, 2001; 162 (2):
317-326.

"Both species are drought-tolerant, perennial, C4 bunch-grasses that
rely on apomictic seeds for reproduction. "

The influence of fire on the demography of a dominant grass species
of West African savannas, Hyparrhenia diplandra.
Garnier-Lisa-K-M; Dajoz-Isabelle {a}
Journal-of-Ecology. [print] April, 2001; 89 (2): 200-208.

"differences between clones showed that growth rate also had a
genetic basis in this apomictic species."

Genetic variability and phytogeography of Miscanthus sinensis var.
condensatus, an apomictic grass, based on RAPD fingerprints.
Chou-Chang-Hung; Chiang-Yu-Chung; Chiang-Tzen-Yuh {a}
Canadian-Journal-of-Botany. [print] October, 2000; 78 (10): 1262-1268.

An apomictic autotriploid line TAR identified in Oryza sativa.
Liu-Yong-Sheng {a}; Sung-Jing-San; Hsu-Francis {a}
Acta-Botanica-Sinica. 1996; 38 (11) 917-920.

Embryological study on apomixis in a sorghum line SSA-1.
Wu-Shu-Biao {a}; Shang-Yong-Jin {a}; Han-Xue-Mei {a}; Wang-Jing-Xue
{a}; Niu-Tian-Tang; Zhang-Fu-Yao; Wei-Yao-Ming; Meng-Cue-Gang;
Yan-Xi-Mei; Zheng-Jing-Bo
Acta-Botanica-Sinica. 1994; 36 (11) 833-837.

Evolution of reproduction in Lamprothyrsus (Arundineae: Gramineae).
Connor-H-E {a}; Dawson-M-I
Annals-of-the-Missouri-Botanical-Garden. 1993; 80 (2) 513-517.
Lamprothyrsus, a ditypic arundinoid, South American grass genus,
consists predominantly of populations of exclusively female plants
in which seeds are set by autonomous apospory.

A cytogenetic study of a hexaploid Themeda triandra Forssk. population.
Fossey-Annabel; Liebenberg-H
South-African-Journal-of-Botany. 1992; 58 (4) 275-276.

"The data support the fact that the hexaploids are near
obligate apomicts."

Apomixis in the gramineae.
Ma-Guo-hua {a}; Zhao-Nan-xian {a}; Huang-Xue-lin
Journal-of-Tropical-and-Subtropical-Botany. [print] 2001; 9 (1):
83-92.
Gramineae is one of the largest families with widest distribution on
the globe. It contains most important crops in the world including
a great number of apomictic species. Apomixis has great potentialities
for utilization of crop hybrid vigor. However, apomixis as a
reproductive way of diversity in plant revolution is very comprehensive.
In this paper, the distribution of apomictic species in Gramineae is
reviewed. Advance in studies on apomixes in aspects of cytology,
genetics and molecular biology are also summarized.

The structure of agamocomplexes and the problem of saltatory
speciation in angiosperms.
Kashin-A-S
Botanicheskii-Zhurnal-St-Petersburg. Jan., 1999; 84 (1): 15-29.
Russian; Non-English
Summary: English; Russian

[among the organisms listed:
Bothriochloa- (Gramineae-); Calamagrostis- (Gramineae-); Dichanthium-
(Gramineae-);Poa- (Gramineae-)]

Okay, so far we've got about 19 - 20 or so grass genera with known
apomictic forms. I''ve no doubt there are plenty more.

cheers





  #15   Report Post  
Old 27-08-2003, 12:02 AM
Frank Martin
 
Posts: n/a
Default Apomictic Grasses

Surely this reply is too astringent and acerbic and not in keeping with the
respect due to fellow scientists.
Phred may be some nascent biologist whose botanical heart has just been
crushed by your cruel put-downs.
Do you want that on your conscience?

"Cereoid-UR12-" wrote in message
m...
I'm not a student, Buckwheat.

I just want you to put your money where you flip mouth is, you superficial
smartass.

You still haven't answered the question, you ******.

I asked for a list of SPECIES in ten different genera not just random list
of generic names.

Any idiot can randomly throw out the names of genera and you have proven
that.

Most if not all of the species in those genera ARE NOT APOMICTIC.

That makes you the lazy parasite who cannot back the outrageous statements
you make.


Phred wrote in message
...
In article ,
"Cereoid-UR12-" wrote:
Name ten grasses in different genera that are apomictic!!!


Here's a few you can look up... but I'm stuffed if I'm going to do
*all* your homework for you, so look up the details for yourself and
don't be a typical lazy student parasitising the web.

In no particular order: Brachiaria, Paspalum, Eragrostis, Poa,
Dichanthium, Tripsacum, Cenchrus, Pennisetum, Panicum, Hyparrhenia,
Vetiveria, Themeda, Heteropogon, Bouteloua, Bothriochloa,
Capillipedium... (And I suppose we could even throw in Zea now.)


Cheers, Phred.

--
LID





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