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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,†
,
2,†
,
1,* and 1,*
1
Key Laboratory of Bio-Organic Fertilizer Creation, Ministry of Agriculture, Anhui Science and Technology University, Bengbu 233100, China
2
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]   |  

Abstract

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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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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