…The nucellus usually disappears or becomes membranous, but it can grow by storing nutrients and become a perisperm, as in Swiss chard. Seeds that store nutrients in the endosperm or exosperm are called albuminous seeds. Even if nutrients are temporarily stored in the endosperm or exosperm, as the seed matures, the nutrients are gradually absorbed into the embryo, and by the time the seed is fully ripe, the embryo often fills the inside of the seed. … From [Endosperm]…As seeds mature, the nutrients stored in the endosperm are absorbed by the embryo, and some nutrients are stored in the cotyledons, which are part of the embryo. These are called exalbuminous seeds, and are found in chestnuts, beans, sunflowers, etc. On the other hand, seeds in which nutrients are stored in the endosperm or perisperm are called albuminous seeds. … *Some of the terminology that mentions "albuminous seed" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…珠心は普通,消失したり膜状となるが,養分をたくわえて大きくなり,フダンソウのように外胚乳perispermとなることがある。胚乳や外胚乳に栄養分をたくわえたものを胚乳種子albuminous seedという。たとえ胚乳や外胚乳に一時的に栄養分がたくわえられたとしても,種子の成熟の過程で,栄養分がしだいに胚に吸収され,完熟したころには胚が種子の内部をいっぱいにしていることも多い。… 【胚乳】より…種子が成熟する過程で,胚乳にたくわえられる養分が,胚によって吸収され,胚の一部である子葉に養分がたくわえられるものがある。このようなものを無胚乳種子exalbuminous seedと呼び,クリ,マメ類,ヒマワリなどにみられる。一方,胚乳や周乳に養分がたくわえられたものを胚乳種子albuminous seedとよぶ。… ※「albuminous seed」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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