数字农科院2.0

Efficacy of indole acetic acid and exopolysaccharides- producing bacillus safensis strain FN13 for inducing cd-stress tolerance and plant growth promotion in brassica juncea (L.)

文献类型： 外文期刊

作者： Nazli Farheen;Wang Xiukang;Ahmad Maqshoof;Hussain Azhar;Bushra ;Dar Abubakar;Nasim Muhammad;Jamil Moazzam;Panpluem Nalun;Mustafa Adnan

作者机构：

关键词： Bacillus; Brassica; Exopolysaccharides; Metal toxicity; Phytostabilization; Plant-microbeinteractions

期刊名称： Applied Sciences (Switzerland)

ISSN： 2076-3417

年卷期： 2021 年 11 卷 9 期

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收录情况： JCR（2021版）

摘要： Untreated wastewater used for irrigating crops is the major source of toxic heavy metals and other pollutants in soils. These heavy metals affect plant growth and deteriorate the quality of edible parts of growing plants. Phytohormone (IAA) and exopolysaccharides (EPS) producing plant growth-promoting rhizobacteria can reduce the toxicity of metals by stabilizing them in soil. The present experiment was conducted to evaluate the IAA and EPS-producing rhizobacterial strains for improving growth, physiology, and antioxidant activity of Brassica juncea (L.) under Cd-stress. Results showed that Cd-stress significantly decreased the growth and physiological parameters of mustard plants. Inoculation with Cd-tolerant, IAA and EPS-producing rhizobacterial strains, however, significantly retrieved the inhibitory effects of Cd-stress on mustard growth, and physiology by up regulating antioxidant enzyme activities. Higher Cd accumulation and proline content was observed in the roots and shoot tissues upon Cd-stress in mustard plants while reduced proline and Cd accumulation was recorded upon rhizobacterial strains inoculation. Maximum decrease in proline contents (12.4%) and Cd concentration in root (26.9%) and shoot (29%) in comparison to control plants was observed due to inoculation with Bacillus safensis strain FN13. The activity of antioxidant enzymes was increased due to Cd-stress; however, the inoculation with Cd-tolerant, IAA-producing rhizobacterial strains showed a non-significant impact in the case of the activity of superoxide dismutase (SOD), peroxidase (POX) and catalase (CAT) in Brassica juncea (L.) plants under Cd-stress. Overall, Bacillus safensis strain FN13 was the most effective strain in improving the Brassica juncea (L.) growth and physiology under Cd-stress. It can be concluded, as the strain FN13 is a potential phytostabilizing biofertilizer for heavy metal contaminated soils, that it can be recommended to induce Cd-stress tolerance in crop plants. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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