Abstract
Treatment with 0.5 mM salicylic acid (SA) significantly alleviated growth inhibition induced by drought in wheat seedlings, manifested by less decreassed fresh mass, dry mass, plant height, root length, and less increased lipid peroxidation. Under drought stress, SA significantly increased the content of ascorbate (ASA) and glutathione (GSH). We determined the full-length cDNA sequences of genes encoding the glutathione-S-transferase 1 (GST1) and 2 (GST2) and we also measured the transcription of eight genes related to ASA-GSH cycle. The results indicated that exogenous SA significantly enhanced the transcription of GST1, GST2, glutathione reductase (GR), and monodehydroascorbate reductase (MDHAR) genes during almost the entire drought period, but only increased those of dehydroascorbate reductase (DHAR) at 12 h, glutathione peroxidase (GPX1) at 48 h, phospholipid hydroperoxide glutathione peroxidase (GPX2) at 12 and 24 h, and glutathione synthetase (GSHS) at 12, 24, and 48 h. This implies that SA alleviates the detrimental effects of drought stress on wheat seedling growth by influencing the ASA-GSH cycle.
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Abbreviations
- ASA:
-
ascorbate
- CAT:
-
catalase
- DHAR:
-
dehydroascorbate reductase
- GPX:
-
glutathione peroxidase
- GR:
-
glutathione reductase
- GSH:
-
glutathione
- GSHS:
-
glutathione synthetase
- GST:
-
glutathione-S-transferase
- MDA:
-
malondialdehyde
- MDHAR:
-
monodehydroascorbate reductase
- POX:
-
peroxidase
- qPCR:
-
quantitative real-time PCR
- RACE:
-
the rapid amplification of cDNA ends
- ROS:
-
reactive oxygen species
- SA:
-
salicylic acid
- SOD:
-
superoxide dismutase
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Acknowledgements: This study was financially supported by the Open Item of the State Key Laboratory of Plant Cell and Chromosome Engineering (2010-PCCE-KF-02), the Open Item of the State Key Laboratory of Crop Genetics and Gerplasm Enhancement (ZW2009003) and the National Basic Research Program of China (2009CB118602). We would like to thank to Dr. Jianwu Li for his valuable suggestions on the revised manuscript.
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Kang, G.Z., Li, G.Z., Liu, G.Q. et al. Exogenous salicylic acid enhances wheat drought tolerance by influence on the expression of genes related to ascorbate-glutathione cycle. Biol Plant 57, 718–724 (2013). https://doi.org/10.1007/s10535-013-0335-z
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DOI: https://doi.org/10.1007/s10535-013-0335-z