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Article

Effects of Phytohormone-Producing Rhizobacteria on Casparian Band Formation, Ion Homeostasis and Salt Tolerance of Durum Wheat

1
Ufa Federal Research Centre, Ufa Institute of Biology, RAS, Prospekt Oktyabrya, 69, 450054 Ufa, Russia
2
Russia Research Institute for Agricultural Microbiology, Group of Culture of Beneficial Microorganisms, Podbelskogo sh. 3, Pushkin, 196608 Saint-Petersburg, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Daisuke Todaka
Biomolecules 2022, 12(2), 230; https://doi.org/10.3390/biom12020230
Received: 22 December 2021 / Revised: 21 January 2022 / Accepted: 26 January 2022 / Published: 29 January 2022
(This article belongs to the Special Issue Phytohormones 2021)
Inoculation with plant growth-promoting rhizobacteria can increase plant salt resistance. We aimed to reveal bacterial effects on the formation of apoplastic barriers and hormone concentration in relation to maintaining ion homeostasis and growth of salt-stressed plants. The rhizosphere of a durum wheat variety was inoculated with cytokinin-producing Bacillus subtilis and auxin-producing Pseudomonas mandelii strains. Plant growth, deposition of lignin and suberin and concentrations of sodium, potassium, phosphorus and hormones were studied in the plants exposed to salinity. Accumulation of sodium inhibited plant growth accompanied by a decline in potassium in roots and phosphorus in shoots of the salt-stressed plants. Inoculation with both bacterial strains resulted in faster appearance of Casparian bands in root endodermis and an increased growth of salt-stressed plants. B. subtilis prevented the decline in both potassium and phosphorus concentrations and increased concentration of cytokinins in salt-stressed plants. P. mandelii decreased the level of sodium accumulation and increased the concentration of auxin. Growth promotion was greater in plants inoculated with B. subtilis. Increased ion homeostasis may be related to the capacity of bacteria to accelerate the formation of Casparian bands preventing uncontrolled diffusion of solutes through the apoplast. We discuss the relative impacts of the decline in Na accumulation and maintenance of K and P content for growth improvement of salt-stressed plants and their possible relation to the changes in hormone concentration in plants. View Full-Text
Keywords: durum spring wheat; Triticum durum Desf.; salinity; sodium; potassium; phosphorus; plant growth-promoting rhizobacteria (PGPR); cytokinins; indoleacetic acid durum spring wheat; Triticum durum Desf.; salinity; sodium; potassium; phosphorus; plant growth-promoting rhizobacteria (PGPR); cytokinins; indoleacetic acid
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MDPI and ACS Style

Martynenko, E.; Arkhipova, T.; Safronova, V.; Seldimirova, O.; Galin, I.; Akhtyamova, Z.; Veselov, D.; Ivanov, R.; Kudoyarova, G. Effects of Phytohormone-Producing Rhizobacteria on Casparian Band Formation, Ion Homeostasis and Salt Tolerance of Durum Wheat. Biomolecules 2022, 12, 230. https://doi.org/10.3390/biom12020230

AMA Style

Martynenko E, Arkhipova T, Safronova V, Seldimirova O, Galin I, Akhtyamova Z, Veselov D, Ivanov R, Kudoyarova G. Effects of Phytohormone-Producing Rhizobacteria on Casparian Band Formation, Ion Homeostasis and Salt Tolerance of Durum Wheat. Biomolecules. 2022; 12(2):230. https://doi.org/10.3390/biom12020230

Chicago/Turabian Style

Martynenko, Elena, Tatiana Arkhipova, Vera Safronova, Oksana Seldimirova, Ilshat Galin, Zarina Akhtyamova, Dmitry Veselov, Ruslan Ivanov, and Guzel Kudoyarova. 2022. "Effects of Phytohormone-Producing Rhizobacteria on Casparian Band Formation, Ion Homeostasis and Salt Tolerance of Durum Wheat" Biomolecules 12, no. 2: 230. https://doi.org/10.3390/biom12020230

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