Journal
GENES
Volume 8, Issue 7, Pages -Publisher
MDPI AG
DOI: 10.3390/genes8070173
Keywords
volatile organic compounds; iron uptake; auxin; cadmium stress; nitric oxide
Categories
Funding
- National Natural Science Foundation of China [31600210]
- Research Foundation of Ministry of Agriculture [BOFC2015KB02]
- National Sparking Plan Project [2015GA710013, 2015GA710014]
- Anhui Science and Technology Committee [1301032151, 15CZZ03102, 1604f0704045]
- Natural Science Foundation of Anhui Province [1508085QD74, 1608085MC59]
- Research Foundation of Anhui Science and Technology University [ZRC2014403]
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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) uptakeand 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.
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