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首页> 外文期刊>African Journal of Biotechnology >A highly osmotolerant rhizobial strain confers a better tolerance of nitrogen fixation and enhances protective activities to nodules of Phaseolus vulgaris under drought stress
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A highly osmotolerant rhizobial strain confers a better tolerance of nitrogen fixation and enhances protective activities to nodules of Phaseolus vulgaris under drought stress

机译：高度渗透性的根瘤菌菌株赋予了更好的固氮能力，并增强了干旱胁迫下菜豆的结节保护作用。

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The effect of water deficiency on nodules of common bean (Phaseolus vulgaris) inoculated with three rhizobial strains differing in their osmotolerance, was investigated in two different experiments on sterile sand. In the first experiment, the control plants were maintained at 90%?field capacity?(FC) and water-deficient plants were grown at 35% FC. The nitrogen fixation and growth parameters drastically decreased under water deficiency, however the three rhizobial strains,?Rhizobium etli?A32 (sensitive),?Rhizobium tropici?CIAT899 (tolerant),?and?Ensifer meliloti?4H41 (highly tolerant), showed different symbiotic performances.?E. meliloti?4H41 allowed the best acetylene reduction activity (ARA) and biomass production and the highest number of large-sized nodules, while no significant effect was observed on lipid peroxidation, protein and legheamoglobin contents. The effect on antioxidant activities was the lowest. In the second experiment, plants were maintained at 90% FC during 45 days and then watering was stopped. The results showed that, the response to water deficit was quite similar for the three analyzed symbioses until 35% FC, but below this value of FC, symbiosis involving strain?E. meliloti?4H41 was the most tolerant. This tolerance was accompanied, by in both experiments, by a stability of metabolic indices and protective antioxidant activities. These results suggest that, the relative tolerance of the nodules induced by strain 4H41 could be due to a constructive adaptation involving specific cortex structure and stress-adapted metabolic activities acquired during nodule formation and growth, rather than to a timely inducible response due to the stimulation of antioxidant enzymes. This suggestion should be confirmed through microscopic structure analysis and supplemental key enzymes in nodule metabolism such as sucrose synthase and malate dehydrogenase.
机译：在两个不同的无菌沙土实验中，研究了缺水对接种三种渗透压不同的根瘤菌的普通豆（菜豆）结节的影响。在第一个实验中，对照植物保持在90％的田间持水量（FC），缺水植物保持在35％FC。在缺水的条件下，固氮和生长参数急剧下降，但是三种根瘤菌菌株：耐根瘤菌A32（敏感），热带根瘤菌，CIAT899（耐受）和甜竹（Ensifer meliloti）4H41（高度耐受）表现出不同。共生表演。 meliloti？4H41具有最佳的乙炔还原活性（ARA）和生物量产生，以及最大数量的大型结节，而对脂质过氧化，蛋白质和豆血红蛋白含量没有显着影响。对抗氧化剂活性的影响最低。在第二个实验中，将植物在45天内保持在90％的FC下，然后停止浇水。结果表明，三个被分析的共生菌对水分亏缺的反应非常相似，直到FC达到35％，但低于该FC值，即涉及菌株E的共生。 meliloti？4H41最耐受。在两个实验中，这种耐受性都伴随着代谢指数的稳定性和保护性抗氧化剂活性。这些结果表明，菌株4H41诱导的结节的相对耐受性可能是由于涉及特定皮质结构和结节形成和生长过程中获得的应激适应性代谢活动的建设性适应，而不是由于刺激引起的及时诱导反应抗氧化酶。该建议应通过显微结构分析和结节代谢中的补充关键酶（如蔗糖合酶和苹果酸脱氢酶）得到证实。

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