…Some cycad roots grow upward near the surface of the soil, branching into two branches and forming nodule-like structures. A ring-shaped layer forms in the cortex of this nodule, and a species of blue-green algae, Anabaena cycadeae , enters into it. It is not clear what role this blue-green algae plays there, but it has been reported that the chromosome number of the cycad root cells in that layer is reduced. … *Some of the terminology that mentions "Anabaena cycadeae" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ソテツ類の根には,地表近くへ上向きに伸びるものがあり,二叉(にさ)状に分岐して,根粒のようなこぶ状の構造をつくる。このこぶ状の構造の皮層に環状の層ができ,そこに藍藻(らんそう)の1種のAnabaena cycadeaeが入りこんでいる。この藍藻がそこでどんな役割を果たしているのかは明らかにされていないが,その層のソテツの根の細胞の染色体数に減数の起こっていることが報告されている。… ※「Anabaena cycadeae」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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