from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Having no albumen about the embryo; said of certain seeds.
from the GNU version of the Collaborative International Dictionary of English
- adj. Having no albumen about the embryo; -- said of certain seeds.
from The Century Dictionary and Cyclopedia
- In botany, without albumen: applied to seeds.
These terms, extensively used by systematists, only refer, however, to the grosser features of the seed, and indicate the more or less evident occurrence of a food-reserve; many so-called exalbuminous seeds show to microscopic examination a distinct endosperm which may have other than a nutritive function.
We should expect the albuminous state of the seed to be an antecedent one to the exalbuminous condition, and the recent discoveries in fertilization tend to confirm this view.
In species with exalbuminous seeds, the endosperm is eventually consumed and its space occupied by the embryo during seed development.
In contrast to the extensive study of species with persistent endosperm, little is known about the global gene expression pattern in the endosperm of exalbuminous seed species such as crucifer oilseeds.