Root nodule

Japanese: root nodule(英語表記)rootnodule
Root nodule

...A granular structure formed when root nodule bacteria invade the roots of a plant. In the case of legumes, Rhizobium invades. There are many examples of root nodules being formed in plants other than legumes, and it can even be said to be a fairly common phenomenon in woody plants. In alder and bayberry, a type of actinomycete called Frankia forms nodules and fixes nitrogen. This bacterium is also a type of rhizobia. A structure similar to a root nodule can also be seen in cycads. Some cycad roots grow upward near the ground surface, branching into two forks and forming knobby structures similar to root nodules. ...

*Some of the terminology that mentions "root nodule" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…植物の根に根粒菌が侵入したときにできる粒状の構造。マメ科植物の場合にはRhizobiumが侵入する。 マメ科植物以外にも根粒の形成される例は多く,木本ではむしろごくふつうの現象とさえいえる。ハンノキやヤマモモでは放線菌の1種のFrankiaが根粒をつくり,窒素固定を行っている。この菌も根粒菌の一種である。また,根粒類似の構造がソテツにもみられる。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。…

※「root nodule」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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