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苜蓿中华根瘤菌(Sinorhizobium meliloti) nifA基因通过诱导宿主防卫反应调节根瘤的形成 被引量:2

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摘要 苜蓿中华根瘤菌nifA基因是固氮基因的正调节因子,本文研究了nifA基因对根瘤形成的调节作用.在分裂根实验中,nifA突变株对另一侧根的结瘤抑制率比野生型菌下降43.7%,感染突变株植物合成的植保素和形成的坏死细胞的数量也相应减少,与植物防卫反应相关的苯丙氨酸解氨酶基因、查儿酮合成酶基因和几丁质酶基因不能表达.这些结果说明,苜蓿中华根瘤菌nifA基因通过诱导宿主植物的防卫反应对根瘤的形成进行调节.虽然nifA突变株在宿主植物上引发根瘤的数量增加,它合成的结瘤因子的量却比野生型菌株少.因此,可以推测nifA基因介导了多种信号途径对根瘤的形成进行调节.
出处 《科学通报》 EI CAS CSCD 北大核心 2007年第19期2287-2291,共5页 Chinese Science Bulletin
基金 国家重点基础研究发展计划(批准号:2001CB108901) 国家自然科学基金(批准号:30170512)资助项目
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参考文献33

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二级参考文献61

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