Scientia Agricultura Sinica ›› 2010, Vol. 43 ›› Issue (9): 1963-1968 .doi: 10.3864/j.issn.0578-1752.2010.09.025

• RESEARCH NOTES • Previous Articles     Next Articles

Effects of Calcium on Photosynthesis and Chlorophyll Fluorescence of ‘Kyoho’ Grape Under High Temperature Stress

ZHENG Qiu-ling, TAN Wei, MA Ning, ZHAI Heng
   

  1. （山东农业大学园艺科学与工程学院/作物生物学国家重点实验室）
  • Received:2009-09-18 Revised:2010-01-07 Online:2010-05-01 Published:2010-05-01
  • Contact: ZHAI Heng

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Abstract:

【Objective】 In order to reveal the protection function of calcium on photosynthetic organ in leaves of ‘Kyoho’ grape under high temperature stress, the effects of CaCl2 on photosynthesis and chlorophyll fluorescence under heat stress were studied. 【Method】 During the period of high temperature, the grapes grown in the field were pretreated with CaCl2, CaCl2+Ca2+ chelator EGTA and CaCl2+CaM antagonist CPZ. Photosynthetic rate, chlorophyll fluorescence and MDA content were determined. 【Result】The net photosynthesis rate (Pn), qP, Fv’/Fm’ and Fv/Fm in the grape leaves pretreated with CaCl2 were much higher than that of the control, while Fo was much less than that of the control, and the accumulation of final product of membrane lipid peroxidation (MDA) was slightly lower than the control. EGTA and CPZ pretreatments significantly inhibited the photosythesis, Pn were 29.4% and 26.5% lower than that of CaCl2 pretreatment; the activity of PSⅡ was inhibited significantly, the accumulation of MDA were 33.7% and 40.2% higher than that of CaCl2 pretreatment. 【Conclusion】 CaCl2 pretreatment effectively alleviated the inhibition of photosynthesis in grape leaves under high temperature stress and the damage to the function of PSⅡ to some extent.

Key words: grape, high temperature, calcium, photosynthesis, chlorophyll fluorescence

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