| Sinorhizobium meliloti nifA gene exerts a pleiotropic effect on nodulation through the enhanced plant defense response |
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| 作者姓名： | CHEN XiaoTao ZOU HuaSong YAO ZhenHua CHENG HaiPing DAI XiaoMi ZHU JiaBi YU GuanQiao |
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| 作者单位： | [1]National Laboratory of Plant Molecular Genetics, Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100039, China [3]Biological Sciences Department, Lehman College, the City University of New York, Bronx, New York 10468, USA |
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| 基金项目： | Supported by the National Basic Research Program of China （Grant No. 2001CB108901） and National Natural Science Foundation of China （Grant No. 30170512） The authors thank Dr. Jording D. for the gift of Rml491G strain. |
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| 摘 要： | Sinorhizobium meliloti nifA gene is required for the expression of a bunch of nif and fix genes. Here, we report its pleiotropic effects on the nodule formation. Compared with wild type strain, nifA mutant sig- nificantly reduced nodule suppression rate in split-root system. The plants inoculated with mutant strain produced lower amount of daidzein and less necrotic cells on their roots. In addition, the defense genes failed to be evoked by nifA mutant at the early nodulation stage. These findings indicated that host defense response was one of the mechanisms mediated by nifA gene to regulate nodule formation during symbiosis. Even though nifA mutant could increase the number of nodules in host plant, it synthesized lower Nod factors than wild type. This suggested that nifA gene mediated multiple and diverse instances in nodulation formation.
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| 关 键 词： | 多效性反应 结瘤 植物 防御能力 |
| 收稿时间： | 11 June 2007 |
| 修稿时间： | 2007-06-11 |
<Emphasis Type="Italic">Sinorhizobium meliloti nifA</Emphasis> gene exerts a pleiotropic effect on nodulation through the enhanced plant defense response |
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| CHEN XiaoTao ZOU HuaSong YAO ZhenHua CHENG HaiPing DAI XiaoMi ZHU JiaBi YU GuanQiao.Sinorhizobium meliloti nifA gene exerts a pleiotropic effect on nodulation through the enhanced plant defense response[J].Chinese Science Bulletin,2007,52(21):2925-2929. |
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| Authors: | Chen XiaoTao Zou HuaSong Yao ZhenHua Cheng HaiPing Dai XiaoMi Zhu JiaBi Yu GuanQiao |
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| Institution: | (1) National Laboratory of Plant Molecular Genetics, Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100039, China;(3) Biological Sciences Department, Lehman College, the City University of New York, Bronx, New York 10468, USA |
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| Abstract: | Sinorhizobium meliloti nifA gene is required for the expression of a bunch of nif and fix genes. Here, we report its pleiotropic effects on the nodule formation. Compared with wild type strain, nifA mutant sig- nificantly reduced nodule suppression rate in split-root system. The plants inoculated with mutant strain produced lower amount of daidzein and less necrotic cells on their roots. In addition, the defense genes failed to be evoked by nifA mutant at the early nodulation stage. These findings indicated that host defense response was one of the mechanisms mediated by nifA gene to regulate nodule formation during symbiosis. Even though nifA mutant could increase the number of nodules in host plant, it synthesized lower Nod factors than wild type. This suggested that nifA gene mediated multiple and diverse instances in nodulation formation. |
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| Keywords: | nifA hypersensitive response nodulation Nod factor |
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