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Int. J. Mol. Sci. 2016, 17(6), 976; doi:10.3390/ijms17060976

Rhizobacterial Strain Bacillus megaterium BOFC15 Induces Cellular Polyamine Changes that Improve Plant Growth and Drought Resistance

1,2,†
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2,†
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1
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2
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2
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1,* and 2,*
1
School of Life Science and Technology, Tongji University, Shanghai 200092, China
2
Key Laboratory of Bio-Organic Fertilizer Creation, Ministry of Agriculture, Anhui Science and Technology University, Bengbu 233100, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Marcello Iriti
Received: 11 March 2016 / Revised: 31 May 2016 / Accepted: 3 June 2016 / Published: 21 June 2016
(This article belongs to the Section Molecular Botany)
View Full-Text   |   Download PDF [3837 KB, uploaded 21 June 2016]   |  

Abstract

Plant-growth-promoting rhizobacteria can improve plant growth, development, and stress adaptation. However, the underlying mechanisms are still largely unclear. We investigated the effects of Bacillus megaterium BOFC15 on Arabidopsis plants. BOFC15 produced and secreted spermidine (Spd), a type of polyamine (PA) that plays an important role in plant growth. Moreover, BOFC15 induced changes in the cellular PAs of plants that promoted an increase of free Spd and spermine levels. However, these effects were remarkably abolished by the addition of dicyclohexylamine (DCHA), a Spd biosynthetic inhibitor. Additionally, the inoculation with BOFC15 remarkably increased plant biomass, improved root system architecture, and augmented photosynthetic capacity. Inoculated plants also displayed stronger ability to tolerate drought stress than non-inoculated (control) plants. Abscisic acid (ABA) content was notably higher in the inoculated plants than in the control plants under drought stress and polyethylene glycol (PEG)-induced stress conditions. However, the BOFC15-induced ABA synthesis was markedly inhibited by DCHA. Thus, microbial Spd participated in the modulation of the ABA levels. The Spd-producing BOFC15 improved plant drought tolerance, which was associated with altered cellular ABA levels and activated adaptive responses. View Full-Text
Keywords: Bacillus megaterium; polyamines; drought tolerance; abscisic acid; Arabidopsis thaliana Bacillus megaterium; polyamines; drought tolerance; abscisic acid; Arabidopsis thaliana
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhou, C.; Ma, Z.; Zhu, L.; Xiao, X.; Xie, Y.; Zhu, J.; Wang, J. Rhizobacterial Strain Bacillus megaterium BOFC15 Induces Cellular Polyamine Changes that Improve Plant Growth and Drought Resistance. Int. J. Mol. Sci. 2016, 17, 976.

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