…Even if nutrients are temporarily stored in the endosperm and exosperm, as the seed matures, the nutrients are gradually absorbed by the embryo, and by the time the seed is fully ripe, the embryo often fills the inside of the seed. Such seeds are called exalbuminous seeds, and store nutrients in the cotyledons. Examples include beans, radishes, pumpkins, and sunflowers, but the cotyledons of walnuts, acorns, and peaches are storage organs, and the cotyledons themselves do not emerge above ground when the seed germinates. … 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 "exalbuminous seed" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…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。このような種子を無胚乳種子exalbuminous seedといい,子葉に栄養分を貯蔵している。マメ類,ダイコン,カボチャ,ヒマワリなどがその例であるが,クルミ,ドングリ類,モモなどの子葉は貯蔵器官となって,発芽のさい子葉自身は地上に出ることはない。… 【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。… ※「exalbuminous 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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