Abstract
Soil salinity seriously limits plant growth and yield. Strategies have been developed for plants to cope with various environmental stresses during evolution. To screen for the broad-spectrum genes and the molecular mechanism about a hydroxyproline-tolerant mutant of peanut with enhanced salinity resistance under salinity stress, digital gene expression (DGE) sequencing was performed in the leaves of salinity-resistant mutant (S2) and Huayu20 as control (S4) under salt stress. The results indicate that major transcription factor families linked to salinity stress responses (NAC, bHLH, WRKY, AP2/ERF) are differentially expressed in the leaves of peanut under salinity stress. In addition, genes related to cell wall loosening and stiffening (xyloglucan endotransglucosylase/hydrolases, peroxidases, lipid transfer protein, expansin, extension), late embryogenesis abundant protein family, fatty acid biosynthesis and metabolism (13-lipoxygenase omega-6 fatty acid desaturase, omega-3 fatty acid desaturase) and some previously reported stress-related genes encoding proteins such as defensin, universal stress protein, metallothionein, peroxidase etc, and some other known or unknown function stress related genes, have been identified. The information from this study will be useful for further research on the mechanism of salinity resistance and will provide a useful genomic resource for the breeding of salinity resistance variety in peanut.
Highlights
Peanut (Arachis hypogaea L.) is an important crop for oil and protein production in the tropical and subtropical regions of the world [1]
About 88.72% to 90.84% of the clean reads in each sample were mapped to our transcriptome reference database (S1 File)
Two digital gene expression (DGE) encoding peroxidases were found to be differentially expressed, and one DGE (c13583_g1) was down-regulated and another DGE (c281633_g1) was up-regulated. These results indicated that the induction or repression of these transcripts in the leaves of peanut under salinity might be necessary for maintaining plant growth under stressful conditions
Summary
Peanut (Arachis hypogaea L.) is an important crop for oil and protein production in the tropical and subtropical regions of the world [1]. It is very likely for it to suffer from salinity stress which would seriously limit its growth and production in the future. It is of great importance to identify the salinity stress resistant genes on a large scale and develop a better understanding. The Salinity Responsive Mechanism of a Hydroxyproline-Tolerant Mutant of Peanut
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