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- Title
A volatile producing Bacillus subtilis strain from the rhizosphere of Haloxylon ammodendron promotes plant root development.
- Authors
He, Ao-Lei; Zhao, Ling-Yu; Ren, Wei; Li, Hui-Ru; Paré, Paul W.; Zhao, Qi; Zhang, Jin-Lin
- Abstract
Aims: The colonization of plant growth-promoting rhizobacteria (PGPR) along plant roots in turn facilitates their ability to promote plant growth and health. In this study, we found that Bacillus subtilis strain WM13-24 from the rhizosphere of Haloxylon ammodendron was able to promote the growth of both Arabidopsis and its host plant. Furthermore, we found that volatile organic compounds (VOCs) from strain WM13-24 could promote plant growth by stimulating lateral root formation and root hair growth. However, the molecular mechanism underlying WM13-24-stimulated root development is still unknown. Methods: In this study, a series of Arabidopsis mutants defective in specific plant hormone signaling pathways were used as materials to preliminarily study the effect of VOCs released by strain WM13-24 on plant root development through genetic and pharmacological methods. The volatile compounds of strain WM13-24 were identified by solid-phase microextraction gas chromatography-mass spectrometry (SPME–GC–MS). Results: WM13-24 was able to promote the growth of both Arabidopsis and its host plant, H. ammodendron. Auxin signaling and transport played a crucial role in WM13-24-stimulated changes of root architectures in Arabidopsis. SPME–GC–MS analysis revealed that WM13-24 produces various classes of compounds. We further showed that 2,3-butanediol and benzyl alcohol were active in promoting plant growth and the growth responses of plants to the two VOCs were concentration dependent. Conclusions: All these results suggested that VOCs emitted from B. subtilis strain WM13-24 from the rhizosphere of H. ammodendron improves root development depending on auxin signaling.
- Subjects
PLANT roots; PLANT development; BACILLUS subtilis; ROOT development; PLANT growth; PLANT colonization; PLANT growth-promoting rhizobacteria
- Publication
Plant & Soil, 2023, Vol 486, Issue 1/2, p661
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-023-05901-2