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#1
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Walnuts and their allies
What advantage do walnuts and their relatives gain from having the
kernels of their nuts such an unusual shape? From my non-walnut point of view it seems that having so many sticking-out bits increases the risk of mechanical damage and drying-out. Mike. |
#2
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Walnuts and their allies
Mike Lyle schreef
What advantage do walnuts and their relatives gain from having the kernels of their nuts such an unusual shape? From my non-walnut point of view it seems that having so many sticking-out bits increases the risk of mechanical damage and drying-out. Mike. + + + Once upon a time this would have been an easy question. It was to resemble to a brain, so as to show walnuts were "brain food". PvR |
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Walnuts and their allies
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#4
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Walnuts and their allies
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#6
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Walnuts and their allies
mel turner schreef
Good question. But of course the lobes and sticking-out bits are kept fairly safe inside the shell, even after germination. [The seedlings are of the hypogeal type in the familiar members of the walnut family]. One thought that occurs to me is that lobed and dissected food-storage tissues in seeds may be partly protected from insect damage. There are teh familiar plates of not-so-edible, fairly hard tissue between the lobes. An insect attacking the seed might tend to confine its activities to a single lobe, or at least it would have a harder time making a meal of the whole seed. Although the lobed seed structures in the walnut family [Juglandaceae] are the cotyledons of the seedling, the situation is reminiscent of something called "ruminate endosperm" that is found in many other families of flowering plants. In these plants the food-storage tissue of the seeds is endosperm, which is lobed and dissected by plates and strands of hard inedible sclerenchyma tissue. An insect trying to eat such endosperm might have difficulty tunneling through it, compared to one living in a similar seed without ruminate [meaning ="chewed"?] endosperm. + + + Who knows? A consideration is that walnuts for their dispersal rely upon their edibility, like acorns. Also the "hard" bits between the lobes are surely less so when walnuts are fresh. PvR PS walnuts are not nuts. PS II according to Harris and Harris indeed "ruminate" = "wrinkled, as if chewed" |
#7
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Walnuts and their allies
Xref: 127.0.0.1 sci.bio.botany:21184
PS walnuts are not nuts. Why not, & if not, what are they? Iris, Central NY, Zone 5a, Sunset Zone 40 "If we see light at the end of the tunnel, It's the light of the oncoming train." Robert Lowell (1917-1977) |
#8
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Walnuts and their allies
PS walnuts are not nuts.
Iris Cohen schreef Why not, & if not, what are they? DAGS? PvR |
#9
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Walnuts and their allies
In article , Iris Cohen
writes PS walnuts are not nuts. Why not, & if not, what are they? Judd et al say that they're drupes. -- Stewart Robert Hinsley |
#10
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Walnuts and their allies
PS walnuts are not nuts.
, Iris Cohen writes Why not, & if not, what are they? Stewart Robert Hinsley schreef Judd & al. say that they're drupes. + + + So does everybody else. A nut is a hard dry fruit, eg. an acorn. The walnut tree has a thick well-fleshed fruit, of which the pericarp is commonly called a husk. Walnuts are drupes, as are coconuts. As to peanuts ... PvR |
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