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Genes 2017, 8(7), 173; doi:10.3390/genes8070173

Bacillus amyloliquefaciens SAY09 Increases Cadmium Resistance in Plants by Activation of Auxin-Mediated Signaling Pathways

1,* and 1,*
Key Laboratory of Bio-Organic Fertilizer Creation, Ministry of Agriculture, Anhui Science and Technology University, Bengbu 233100, China
School of Life Science and Technology, Tongji University, Shanghai 200092, China
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Academic Editors: Sarvajeet Singh Gill, Narendra Tuteja, Ritu Gill, Juan Francisco Jimenez Bremont, Anca Macovei and Naser A. Anjum
Received: 11 May 2017 / Revised: 15 June 2017 / Accepted: 21 June 2017 / Published: 28 June 2017
(This article belongs to the Special Issue Genetic Regulation of Abiotic Stress Responses)
View Full-Text   |   Download PDF [9293 KB, uploaded 28 June 2017]   |  


Without physical contact with plants, certain plant growth-promoting rhizobacteria (PGPR) can release volatile organic compounds (VOCs) to regulate nutrient acquisition and induce systemic immunity in plants. However, whether the PGPR-emitted VOCs can induce cadmium (Cd) tolerance of plants and the underlying mechanisms remain elusive. In this study, we probed the effects of Bacillus amyloliquefaciens (strain SAY09)-emitted VOCs on the growth of Arabidopsis plants under Cd stress. SAY09 exposure alleviates Cd toxicity in plants with increased auxin biosynthesis. RNA-Seq analyses revealed that SAY09 exposure provoked iron (Fe) uptake- and cell wall-associated pathways in the Cd-treated plants. However, SAY09 exposure failed to increase Cd resistance of plants after treatment with 1-naphthylphthalamic acid (NPA) or 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (c-PTIO). Under Cd stress, SAY09 exposure markedly promoted Fe absorption in plants with the increased hemicellulose 1 (HC1) content and Cd deposition in root cell wall, whereas these effects were almost abrogated by treatment with NPA or c-PTIO. Moreover, exogenous NPA remarkably repressed the accumulation of nitric oxide (NO) in the SAY09-exposed roots under Cd stress. Taken together, the findings indicated that NO acted as downstream signals of SAY09-induced auxin to regulate Fe acquisition and augment Cd fixation in roots, thereby ameliorating Cd toxicity. View Full-Text
Keywords: volatile organic compounds; iron uptake; auxin; cadmium stress; nitric oxide volatile organic compounds; iron uptake; auxin; cadmium stress; nitric oxide

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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.; Zhu, L.; Ma, Z.; Wang, J. Bacillus amyloliquefaciens SAY09 Increases Cadmium Resistance in Plants by Activation of Auxin-Mediated Signaling Pathways. Genes 2017, 8, 173.

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