Journal
PLANT GROWTH REGULATION
Volume 81, Issue 1, Pages 1-9Publisher
SPRINGER
DOI: 10.1007/s10725-016-0179-6
Keywords
High temperature; PSII photochemical efficiency; D1 protein; Wheat
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Funding
- State Key Laboratory of Wheat and Maize Crop Science [SKL2014KF-06]
- Scientific Research Foundation of the Higher Education Institutions of He'nan Province, China [15A180040]
- Agricultural Science and Technology Research Project of Henan Province [132102110125]
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Heat stress is one of the main abiotic stresses that limit plant growth. The effects of high temperature on oxidative damage, PSII activity and D1 protein turnover were studied in three wheat varieties with different heat susceptibility (CS, YN949 and AK58). The results showed that heat stress induced lower lipid peroxidation in AK58 and YN949 than CS, which was related to different changes of SOD, CAT, POD and H2O2. Similarly, AK58 and YN949 performed better PSII photochemical efficiency (F-v/F-m, I broken vertical bar PSII and ETR) under high temperature, which was attributed to rapid synthesis and degradation of D1 protein. Moreover, higher expression of D1 protein turnover-related genes (PsbA, STN8, PBCP, Deg1, Deg2, Deg5, Deg8, FtsH1/5 and FtsH2/8) and SOD activity in AK58 and YN949 under normal conditions also established a basis for acclimatizing high temperatures, thereby alleviating PSII photoinhibition and reducing oxidative damage when exposed to heat stress.
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