期刊
PLANT SIGNALING & BEHAVIOR
卷 9, 期 12, 页码 -出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/15592324.2014.977746
关键词
glutathione peroxidase; lipid hydroperoxides; phospholipid hydroperoxide glutathione peroxidase; sunflower; seedling cotyledons; salt stress
资金
- University of Delhi
- University Grants Commission
Sunflower seedlings subjected to 120 mM NaCl stress exhibit high total peroxidase activity, differential expression of its isoforms and accumulation of lipid hydroperoxides. This coincides with high specific activity of phospholipid hydroperoxide glutathione peroxidase (PHGPX) in the 10,000g supernatant from the homogenates of 2-6 d old seedling cotyledons. An upregulation of PHGPX activity by NaCl is evident from Western blot analysis. Confocal laser scanning microscopic (CLSM) analysis of sections of cotyledons incubated with anti-GPX4 (PHGPX) antibody highlights an enhanced cytosolic accumulation of PHGPX, particularly around the secretory canals. Present work, thus, highlights sensing of NaCl stress in sunflower seedlings in relation with lipid hydroperoxide accumulation and its scavenging through an upregulation of PHGPX activity in the cotyledons.
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