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词汇 Root Nodules
分类 英语词汇 英语翻译词典
释义

Root Nodules

英语例句库

Bacteroid A modified bacterial cell in a root nodule, typically a cell of the bacterium Rhizobium in the root nudule of a leguminous plant (family Fabaceae).

在根瘤中经过修饰的细菌细胞，比较典型的是在豆科植物根瘤中的根瘤菌（蝶形花科）。

英语百科

Root nodule

Cross section though a soybean (Glycine max 'Essex') root nodule. The bacterium, Bradyrhizobium japonicum, colonizes the roots and establishes a nitrogen fixing symbiosis. This high magnification image shows part of a cell with single bacteroids within their symbiosomes. In this image, endoplasmic reticulum, dictysome and cell wall can be seen.
A sectioned alder tree root nodule.
Indeterminate nodules growing on the roots of Medicago italica
Diagram illustrating the different zones of an indeterminate root nodule (see text).

Root nodules occur on the roots of plants (primarily Fabaceae) that associate with symbiotic nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. This process has evolved multiple times within the Fabaceae, as well as in other species found within the Rosid clade. The Fabaceae include legume crops such as beans and peas.
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