endosperm

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en·do·sperm

(en'dō-spĕrm),
A storage tissue found in many seeds that nourishes the embryo of a plant.

endosperm

a TRIPLOID (1) tissue found in many angiosperm seeds (e.g. those of the castor oil plant), that serves as a food source for the embryo which develops within it. Nonendospermic seeds (e.g. the runner bean) store their food substances within the cotyledons. See EMBRYO SAC for origin.
References in periodicals archive ?
These differences can be attributed to the absence of endosperm as a source of regulatory cues (Segui-Simarro & Nuez, 2008a).
The absence of regulatory cues coming from the endosperm or other seed tissues may also be behind the callogenic response observed in some species where indifferentiated, callus-like proliferative structures have been described to be formed upon in vitro culture of microspores and pollen grains.
This is due to the abundance of zein fraction of protein in the endosperm, which is very low in lysine content and lacking in tryptophan", the study observes.