( 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