Phytohormone Production by the Endophyte Bacillus safensis TS3 Increases Plant Yield and Alleviates Salt Stress
Author:
Chebotar Vladimir K.1ORCID, Zaplatkin Alexander N.1, Chizhevskaya Elena P.1, Gancheva Maria S.12ORCID, Voshol Gerben P.3, Malfanova Natalia V.3, Baganova Maria E.1, Khomyakov Yuriy V.4, Pishchik Veronika N.1ORCID
Affiliation:
1. All-Russia Research Institute for Agricultural Microbiology, Podbel’skogo Shosse 3, Pushkin, 196608 St. Petersburg, Russia 2. Department of Genetics and Biotechnology, Faculty of Biology, Saint Petersburg State University, 199034 St. Petersburg, Russia 3. Institute of Biology Leiden, Sylviusweg 72, 2333 BE Leiden, The Netherlands 4. Agrophysical Scientific Research Institute, Grazhdansky pr. 14, 195220 St. Petersburg, Russia
Abstract
Endophytic bacteria can be used to overcome the effect of salinity stress and promote plant growth and nutrient uptake. Bacillus safensis colonizes a wide range of habitats due to survival in extreme environments and unique physiological characteristics, such as a high tolerance for salt, heavy metals, and ultraviolet and gamma radiations. The aim of our study was to examine the salt resistance of the endophytic strain TS3 B. safensis and its ability to produce phytohormones and verify its effect on plant yield in field trials and the alleviation of salt stress in pot experiments. We demonstrate that the strain TS3 is capable of producing enzymes and phytohormones such as IAA, ABA and tZ. In pot experiments with radish and oat plants in salinization, the strain TS3 contributed to the partial removal of the negative effect of salinization. The compensatory effect of the strain TS3 on radish plants during salinization was 46.7%, and for oats, it was 108%. We suppose that such a pronounced effect on the plants grown and the salt stress is connected with its ability to produce phytohormones. Genome analysis of the strain TS3 showed the presence of the necessary genes for the synthesis of compounds responsible for the alleviation of the salt stress. Strain B. safensis TS3 can be considered a promising candidate for developing biofertilizer to alleviate salt stress and increase plant yield.
Funder
Russian Science Foundation
Subject
Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics
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