Regulation of Calcium on Photosynthesis and PS Ⅱ Activity of Tomato Leaves Under Daytime Sub-High Temperature Stress

doi:10.7668/hbnxb.2011.03.030

Abstract

Abstract: To analyze the regulation of calcium on photosynthesis and PS Ⅱ activity in tomato leaves under sub-high temperature stress.During the period of sub-high temperature,tomatoes liaoyuanduoli grown in the plastic pot were pretreated with CaCl₂,EGTA(Ca2+ chelator),and LaCl₃(Ca2+ channel inhibitor).Chlorophyll content,photosynthetic rate and chlorophyll fluorescence parameters were investigated.The results showed that photosynthesis in tomato leaves pretreated with daytime sub-temperature was significantly inhibited tomato,and chlorophyll content,Fv/Fm,ΦPS Ⅱ,ETR and qP decreased,but Fo and NPQ increased.Furthermore there were some influences on Gs,Tr and Ls;Chlorophyll content and net photosynthesis rate(Pn) in tomato leaves pretreated with CaCl₂ were significantly increased,and there was no difference in the Fo,Fv/Fm,ΦPS Ⅱ and NPQ between CaCl₂ pretreatment and control,while qP,ETR was slightly lower than that of control,these results showed that there was high PS Ⅱ activity in tomato leaves pretreated with CaCl₂,however,Ls and Ci were not affected;The PS Ⅱ activity in tomato leaves pretreated with calcium inhibitor suffered more serious injuries.Inhibition of photosynthesis in daytime sub-high temperature stress had no relation with stomatal factors,the reduction of photosynthesis may be deceased PS Ⅱ activity which was caused by the damage of PS Ⅱ.CaCl₂ pretreatment effectively alleviated the damage to the function of PS Ⅱ in tomato leaves under sub-high temperature stress,and maintained higher PS Ⅱ activity.Consequently CaCl₂ can relieve the inhibition of photosynthesis due to daytime sub-high temperature stress.

Key words: Tomato, Sub-high temperature, Calcium, Chlorophyll content, Photosynthesis, PS Ⅱ activity

CLC Number:

S641.2

LI Tian-lai, ZHAO Le, HUA Li-jing, ZHAO Xu, DUAN Min-min. Regulation of Calcium on Photosynthesis and PS Ⅱ Activity of Tomato Leaves Under Daytime Sub-High Temperature Stress[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2011, 26(3): 150-156. doi: 10.7668/hbnxb.2011.03.030.

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