Journal
BIOLOGIA PLANTARUM
Volume 57, Issue 4, Pages 718-724Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s10535-013-0335-z
Keywords
dehydroascorbate reductase; glutathione reductase; glutathione synthetase; glutathione-S-transferase; monodehydroascorbate reductase
Categories
Funding
- Open Item of the State Key Laboratory of Plant Cell and Chromosome Engineering [2010-PCCE-KF-02]
- Open Item of the State Key Laboratory of Crop Genetics and Gerplasm Enhancement [ZW2009003]
- National Basic Research Program of China [2009CB118602]
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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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