…Fats are stored mainly in the endosperm or cotyledons in oilseeds, and mainly in the scutellum in starchy seeds such as corn. During germination, they are hydrolyzed to produce fatty acids, some of which are used to synthesize lipids, but most of the remaining part is converted to sugar through beta-oxidation by glyoxysomes and the glyoxylate cycle, and then used for embryo growth. It is known in plants such as cotton that seeds will still germinate if they are separated from the mother plant before they are fully ripe and planted (precocious germination). In this case, the process of seed formation that would normally take place inside the mother plant takes place inside the immature seed, so it is used as a powerful experimental tool to determine how far the seed formation process had progressed at the time of separation. … *Some of the terminology that refers to "precocious germination" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…脂肪は,脂肪種子ではおもに胚乳または子葉に,トウモロコシなどのデンプン種子ではおもに胚盤に蓄えられ,発芽時には加水分解されて脂肪酸を生じ,その一部は脂質の合成に使われるが,残りの大部分はグリオキシソームによるβ酸化およびグリオキシル酸回路を経たのち糖へ変えられ,胚の生長に用いられる。 種子を完熟を待たずに母体から切り離してまくと,それでも発芽することがワタなどで知られている(早熟発芽precocious germination)。この場合には,本来母体の上で行うはずの種子形成の過程が,まかれた未熟種子の体内で行われるので,切り離した時点では種子形成の過程がどの段階まで進んでいたかを知る有力な実験手段として用いられる。… ※「precocious germination」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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