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Article

Brassinosteroid Priming Improves Peanut Drought Tolerance via Eliminating Inhibition on Genes in Photosynthesis and Hormone Signaling

1
Guangdong Key Laboratory of Plant Molecular Breeding, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China
2
Department of Genetics, University of Georgia, Athens, GA 30602, USA
*
Authors to whom correspondence should be addressed.
Genes 2020, 11(8), 919; https://doi.org/10.3390/genes11080919
Received: 6 July 2020 / Revised: 4 August 2020 / Accepted: 7 August 2020 / Published: 11 August 2020
(This article belongs to the Special Issue Genetics and Physiology of Multiple-Stress Tolerance in Crops)
Drought negatively affects the growth and yield of terrestrial crops. Seed priming, pre-exposing seed to a compound, could induce improved tolerance and adaptation to stress in germinated plants. To understand the effects and regulatory mechanism of seed priming with brassinosteroid (BR) on peanut plants, we treated seeds with five BR concentrations and examined dozens of physiological and biochemical features, and transcriptomic changes in leaves under well-watered and drought conditions. We found optimal 0.15 ppm BR priming could reduce inhibitions from drought and increase the yield of peanut, and priming effects are dependent on stage of plant development and duration of drought. BR priming induced fewer differentially expressed genes (DEGs) than no BR priming under well-watered condition. Drought with BR priming reduced the number of DEGs than drought only. These DEGs were enriched in varied gene ontologies and metabolism pathways. Downregulation of DEGs involved in both light perceiving and photosynthesis in leaves is consistent with low parameters of photosynthesis. Optimal BR priming partially rescued the levels of growth promoting auxin and gibberellin which were largely reduced by drought, and increased levels of defense associated abscisic acid and salicylic acid after long-term drought. BR priming induced many DEGs which function as kinase or transcription factor for signal cascade under drought. We proposed BR priming-induced regulatory responses will be memorized and recalled for fast adaptation in later drought stress. These results provide physiological and regulatory bases of effects of seed priming with BR, which can help to guide the framing improvement under drought stress. View Full-Text
Keywords: Arachis Hypogaea L.; brassinosteroid; drought; RNA-Seq; gene expression Arachis Hypogaea L.; brassinosteroid; drought; RNA-Seq; gene expression
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MDPI and ACS Style

Huang, L.; Zhang, L.; Zeng, R.; Wang, X.; Zhang, H.; Wang, L.; Liu, S.; Wang, X.; Chen, T. Brassinosteroid Priming Improves Peanut Drought Tolerance via Eliminating Inhibition on Genes in Photosynthesis and Hormone Signaling. Genes 2020, 11, 919. https://doi.org/10.3390/genes11080919

AMA Style

Huang L, Zhang L, Zeng R, Wang X, Zhang H, Wang L, Liu S, Wang X, Chen T. Brassinosteroid Priming Improves Peanut Drought Tolerance via Eliminating Inhibition on Genes in Photosynthesis and Hormone Signaling. Genes. 2020; 11(8):919. https://doi.org/10.3390/genes11080919

Chicago/Turabian Style

Huang, Luping, Lei Zhang, Ruier Zeng, Xinyue Wang, Huajian Zhang, Leidi Wang, Shiyuan Liu, Xuewen Wang, and Tingting Chen. 2020. "Brassinosteroid Priming Improves Peanut Drought Tolerance via Eliminating Inhibition on Genes in Photosynthesis and Hormone Signaling" Genes 11, no. 8: 919. https://doi.org/10.3390/genes11080919

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