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首页> 外文期刊>Plant and Soil >Mimosine produced by the tree-legume Leucaena provides growth advantages to some Rhizobium strains that utilize it as a source of carbon and nitrogen.
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Mimosine produced by the tree-legume Leucaena provides growth advantages to some Rhizobium strains that utilize it as a source of carbon and nitrogen.

机译：树木豆科植物银合欢（Leucaena）产生的含羞草素为某些根瘤菌利用其作为碳和氮源提供了生长优势。

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摘要

Growth of most Rhizobium strains is inhibited by mimosine, a toxin found in large quantities in the seeds, foliage and roots of plants of the genera Leucaena and Mimosa. Some Leucaena-nodulating strains of Rhizobium can degrade mimosine (Mid+) and are less inhibited by mimosine in the growth medium than the mimosine-non-degrading (Mid-) strains. Ten Mid+ strains were identified that did not degrade 3-hydroxy-4-pyridone (HP), a toxic intermediate of mimosine degradation. However, mimosine was completely degraded by these strains and HP was not accumulated in the cells when these strains were grown in a medium containing mimosine as the sole source of carbon and nitrogen. It is concluded that the mimosine-degrading ability of rhizobia is not essential for nodulation of Leucaena species, but it provides growth advantages to Rhizobium strains that can utilize mimosine, and it suppresses the growth of other strains that are sensitive to this toxin.
机译：含羞草抑制了大多数根瘤菌菌株的生长，含羞草是一种毒素，大量存在于Leucaena和Mimosa属植物的种子，叶片和根中。一些根瘤菌的根瘤菌可降解含羞草（Mid +），并且在生长培养基中对含羞草的抑制作用比不降解含羞草（Mid-）的菌株少。鉴定出十个未降解3-羟基-4-吡啶酮（HP）的Mid +菌株，后者是含羞草降解的有毒中间体。但是，当这些菌株在含mimosine作为唯一碳和氮源的培养基中生长时，它们会完全降解mimosine，并且HP不会在细胞中积累。得出的结论是，根瘤菌的含羞草降解能力对于白粉病菌的根瘤化不是必需的，但它为可以利用含羞草碱的根瘤菌菌株提供了生长优势，并且抑制了对该毒素敏感的其他菌株的生长。

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