anatropous ovule


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Related to anatropous ovule: amphitropous ovule
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Noun1.anatropous ovule - a completely inverted ovule turned back 180 degrees on its stalkanatropous ovule - a completely inverted ovule turned back 180 degrees on its stalk
ovule - a small body that contains the female germ cell of a plant; develops into a seed after fertilization
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Both species have bitegmic and anatropous ovule, obturator, trichomes and a resinuous gland, which is composed of flange-like structures that are modified bractlets (Webster and Webster, 1972).
Seed shape is described here as it is commonly illustrated with the hilum and micropyle at the 'bottom' of the seed, although it is acknowledged that this is developmentally the apex of the anatropous ovule.
The anatropous ovule, a characteristic not previously reported for the genus Syagrus had already been reported for other genera of the Tribe Cocoseae, with Attalea and Cocos (Uhl and Moore, 1971; Guevara and Jauregui, 2008).
Gymnosperm ovules are always unitegmic and also orthotropous so that the podocarp ovule may be seen as anticipating the anatropous ovule of flowering plants, the second integument being responsible for the necessary asymmetric growth.