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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Unraveling the mystery of Nod factor signaling by a genomic approach in Medicago trunactula
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Unraveling the mystery of Nod factor signaling by a genomic approach in Medicago trunactula

机译：通过截短苜蓿的基因组方法揭示Nod因子信号传导的奥秘

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摘要

The availability of reduced nitrogen and phosphate are limiting factors in the productivity of many terrestrial ecosystems. The majority of land plants increase phosphate nutrition by developing intimate associations with beneficial mycor-rhizal fungi. Legumes are unusual among plants because they also establish a symbiosis with nitrogen-fixing bacteria, known generally as rhizobia. A high level of host specificity characterizes symbiotic nitrogen fixation, but such specificity is not observed in mycorrhizal associations. Nevertheless, genetic analyses suggest that a common signaling pathway underlies rhizobial and mycorrhizal associations. Until recently, the molecular nature of the plant symbiosis signaling pathway was unknown, but a spate of articles, including the report by Mitra et al. (3) in this issue of PNAS, have begun to unravel this mystery. The dmi3 gene of Medicago truncatula described by Mitra et al. is necessary for both rhizobial and mycorrhizal interactions and is predicted to encode a calcium- and calmodulin-dependent protein kinase.
机译：还原的氮和磷酸盐的可用性是许多陆地生态系统生产力的限制因素。大多数陆地植物通过与有益的真菌-根真菌建立密切的联系来增加磷酸盐的营养。豆科植物在植物中不常见，因为它们还与固氮细菌（通常称为根瘤菌）共生。高水平的宿主特异性是共生固氮的特征，但在菌根协会中未观察到这种特异性。尽管如此，遗传分析表明，常见的信号传导途径是根瘤菌和菌根结合的基础。直到最近，植物共生信号转导途径的分子性质还是未知的，但是有大量文章，包括Mitra等人的报告。 （3）在本期PNAS中，已经开始揭开这个谜团。 Mitra等人描述的Medi藜苜蓿的dmi3基因。对于根瘤菌和菌根相互作用都是必需的，并且被预测为编码钙和钙调蛋白依赖性蛋白激酶。

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