Application of Bacillus sp. N7 to enhance ozone tolerance of various Oryza sativa in vegetative phase: Possible mechanism and rice productivity
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Author list: Anusaraporn, Siraphatsorn; Autarmat, Sawitree; Treesubsuntorn, Chairat; Thiravetyan, Paitip;
Publisher: Elsevier
Publication year: 2020
Journal: Biocatalysis and Agricultural Biotechnology (1878-8181)
Volume number: 25
ISSN: 1878-8181
Languages: English-Great Britain (EN-GB)
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Abstract
Ozone (O3), a phytotoxic compound, can reduce crop productivity. Improving the O3 tolerance capacity of Oryza sativa L. var. indica cv. Pathum Thani 1 (PTT1) and Oryza sativa L. var. indica cv. RD41 (RD41) by adding a soil bacterium, Bacillus sp. N7, was investigated. After cultivation in an O3 open-top chamber fumigation system (70–150 ppb) for 10 days, the results showed that Bacillus sp. N7 had the ability to protect PTT1 and RD41 plants against O3 stress while maintaining rice quality. Bacillus sp. N7 addition resulted in a significant decrease in malondialdehyde (MDA) levels by enhancing ascorbic acid (AsA) contents. This contributed to the maintenance of a higher photosynthetic performance, including higher stomatal conductance, Fv/Fm ratio, chlorophyll a and chlorophyll b contents and increased O3 tolerance. In addition, plant inoculation with Bacillus sp. N7 led to increased relative water content (RWC) and indole-3-acetic acid (IAA) levels. We therefore suggest that Bacillus sp. N7 is a high-performance plant growth-promoting bacteria (PGPB) and can enhance the O3 tolerance capacity of plants while maintaining rice quality. © 2020 Elsevier Ltd
Keywords
Bacillus sp. N7, Ozone stress
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