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首页> 外文期刊>Soil Biology & Biochemistry >The diversity of rhizobia nodulating chickpea (Cicer arietinum) under water deficiency as a source of more efficient inoculants
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The diversity of rhizobia nodulating chickpea (Cicer arietinum) under water deficiency as a source of more efficient inoculants

机译：缺水条件下根瘤菌根瘤菌鹰嘴豆（Cicer arietinum）的多样性是更有效接种剂的来源

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摘要

Chickpea is an important pulse crop grown mainly in the arid and semi-arid regions. The effect of water deficiency on nodulation, biomass production, and competition for nodule occupancy was evaluated in three different soils with two chickpea cultivars, Amdoun I and Chetoui. Two watering regimes were considered; a control that was irrigated three times per week and a water-deficient treatment that was irrigated only one time a week. Results showed that water deficiency significantly decreased the nodule number and the shoot dry weight for both cultivars. Root-nodule bacteria were isolated and characterized by PCR-RFLP of 16S rDNA and nifD-K intergenic spacer. The results show that water deficiency affects the diversity of nodulating rhizobia. The nodulation by Mesorhizobium mediterraneum was reduced while inefficient nodulation by Ensifer meliloti was favoured. In both treatments, chickpea was preferentially nodulated by nifD-K type N6. Analysis for NaCl tolerance showed that most of rhizobia nodulating chickpea under water deficiency are NaCl tolerant. Inoculation with the selected salt-tolerant strain of M. mediterraneum LILM10 increased significantly nodule number and grain yield in the field.
机译：鹰嘴豆是一种重要的豆类作物，主要生长在干旱和半干旱地区。在三种带有两种鹰嘴豆栽培品种Amdoun I和Chetoui的不同土壤中，评估了缺水对根瘤形成，生物量生产和竞争性的影响。考虑了两种浇水方式;对照组每周灌溉3次，缺水处理则每周灌溉1次。结果表明，缺水显着降低了两个品种的根瘤数和枝干重量。分离根瘤细菌，并通过16S rDNA和nifD-K基因间隔子的PCR-RFLP进行鉴定。结果表明，缺水会影响结瘤根瘤菌的多样性。减少了中生中生根瘤菌的结节，而偏爱Ensifer meliloti的低效结节受到了青睐。在两种处理中，鹰嘴豆均优先被NIF D-K N6型结瘤。对NaCl耐受性的分析表明，缺水条件下根瘤菌根瘤菌的鹰嘴豆大多数都耐NaCl。在田间，接种选定的耐盐甲烷化土壤杆菌LILM10可显着增加根瘤数和籽粒产量。

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