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首页> 美国卫生研究院文献>other >Co-inoculation of a Pea Core-Collection with Diverse Rhizobial Strains Shows Competitiveness for Nodulation and Efficiency of Nitrogen Fixation Are Distinct traits in the Interaction
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Co-inoculation of a Pea Core-Collection with Diverse Rhizobial Strains Shows Competitiveness for Nodulation and Efficiency of Nitrogen Fixation Are Distinct traits in the Interaction

机译：豌豆核心菌种与不同根瘤菌菌株的共接种显示结瘤的竞争能力和固氮效率是相互作用中的不同特征

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Pea forms symbiotic nodules with Rhizobium leguminosarum sv. viciae (Rlv). In the field, pea roots can be exposed to multiple compatible Rlv strains. Little is known about the mechanisms underlying the competitiveness for nodulation of Rlv strains and the ability of pea to choose between diverse compatible Rlv strains. The variability of pea-Rlv partner choice was investigated by co-inoculation with a mixture of five diverse Rlv strains of a 104-pea collection representative of the variability encountered in the genus Pisum. The nitrogen fixation efficiency conferred by each strain was determined in additional mono-inoculation experiments on a subset of 18 pea lines displaying contrasted Rlv choice. Differences in Rlv choice were observed within the pea collection according to their genetic or geographical diversities. The competitiveness for nodulation of a given pea-Rlv association evaluated in the multi-inoculated experiment was poorly correlated with its nitrogen fixation efficiency determined in mono-inoculation. Both plant and bacterial genetic determinants contribute to pea-Rlv partner choice. No evidence was found for co-selection of competitiveness for nodulation and nitrogen fixation efficiency. Plant and inoculant for an improved symbiotic association in the field must be selected not only on nitrogen fixation efficiency but also for competitiveness for nodulation.
机译：豌豆与豆科根瘤菌形成共生结节。蚕豆（Rlv）。在田间，豌豆根可暴露于多种相容的Rlv菌株。人们对结瘤Rlv菌株的竞争力的基础机制以及豌豆在不同的相容性Rlv菌株之间进行选择的能力知之甚少。通过共接种代表豌豆属中遇到的变异性的104个豌豆集合的五种不同Rlv菌株的混合物，研究了豌豆-Rlv伴侣选择的变异性。在另外的单接种实验中，在显示相反Rlv选择的18个豌豆系的子集上，确定了每个菌株赋予的固氮效率。根据豌豆集合的遗传或地理多样性，观察到了Rlv选择的差异。在多次接种实验中评估的给定豌豆-Rlv缔结结节竞争力与其单次接种中确定的固氮效率相关性很低。植物和细菌的遗传决定因素都有助于豌豆-Rlv伴侣的选择。没有证据表明共选择结瘤和固氮效率竞争力。必须选择在田间用于改善共生关系的植物和孕育剂，不仅要考虑固氮效率，还要选择结瘤的竞争力。

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