Abstract
In Potamogeton nodosus Poir., the zygote divides by a transverse wall to form basal and terminal cells. The basal cell wall subjacent to the nucellus stains intensely for the periodic acid-Schiff (PAS) reaction and the cell shows a higher concentration of proteins and RNA than the organogenetic portion of the embryo derived from the terminal cell. Proteins and RNA are uniformly distributed in the embryonic shoot apex, the intraseminal leaves and the procambium, whereas the cotyledonary and hypocotyledonary cells have a low profile for RNA, but are well provided with starch grains and protein bodies. The basal cell persists in the mature seed. During seed development, both the integuments are compressed and lyse, and the seed is protected by the pericarp which comprises a one-layered epicarp, a parenchymatous mesocarp with air spaces and a sclerenchymatous endocarp.
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