Native halo-tolerant plant growth promoting rhizobacteria Enterococcus and Pantoea sp. improve seed yield of Mungbean (Vigna radiata L.) under soil salinity by reducing sodium uptake and stress injury

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• 作者：Meenu Panwar ; Rupinder Tewari ; Harsh Nayyar
• 关键词：Salt stress ; PGPR ; Mungbean ; Stress injury ; Growth ; Sodium ; Chlorophyll
• 刊名：Physiology and Molecular Biology of Plants
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：22
• 期：4
• 页码：445-459
• 全文大小：
• 刊物主题：Plant Sciences; Plant Physiology; Biological and Medical Physics, Biophysics; Cell Biology;
• 出版者：Springer India
• ISSN：0974-0430
• 卷排序：22

文摘

The beneficial microbial-plant interaction plays important role in the soil health, crop growth and productivity. Plant growth promoting rhizobacteria (PGPR) are such beneficial microorganisms, which in association with plant roots not only promote their growth but also help in counteracting the detrimental effects of soil stresses. Salt stress is one such stress, frequently confronted by the plants. The present study aimed at isolation and identification of PGPR inhabiting the mungbean rhizosphere, testing them for salt (NaCl) tolerance and subsequently in salt-supplemented mungbean crop. For this purpose, two salt-tolerant bacterial strains belonging to genus Pantoea and Enterococcus, characterized for their P-solubilization ability, indole acetic acid and siderophore production were selected. These two PGPR were further evaluated for their effect on the salt-stressed mungbean plants, grown at two salt concentrations (5 and 10 dS/m). The plants treated with the combination of PGPR showed better performance in growth (16–37 %) and yield (22–32 %), under salt stress, as compared with control. The increasing salt concentration was found to increase the membrane damage, Na+ concentration in the plants. PGPR treatments effectively reduced the Na+ concentration (17–41 %), membrane damage (1.1–1.5 folds) and enhanced the antioxidants i.e. ascorbic acid (8–26 %) and glutathione (10–30 %) in salt-stressed plants, in comparison to uninoculated stressed plants. Overall, the results indicated that both PGPR were effective as stress mitigators however, in combination they showed relatively better improvement in growth, yield as well as oxidative parameters of the salt-affected plants. These findings about the effects of native salt-tolerant PGPR Pantoea and Enterococcus sp. in mungbean crop are novel.