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Effects of source-sink manipulation on leaf photosynthetic Characteristics in Shatangju tangerine

HUANG Yong-jing,TANG Xiao-lang,MA Pei-qia,WU Wen,DAI Hong-fen,WANG Ping(Institute of Fruit Tree Research,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China)  
In order to study the effects of altered source-sink correlation on leaf photosynthetic characteristics at fruit fast development stages in Shatangju tangerine,fruit thinning and retaining fruit were carried out on one-year-old shoot,and through preventing exportation of the assimilates to the non experimental parts of the tree by girdling one-year-old shoot and keeping the sane leaves between fruit thinning and retaining fruit,and the photosynthetic characteristic was analyzed.The results showed that: Fruit thinning significantly decreased net photosynthetic rate(Pn),stomatal conductance(Gs) and transpiration rate(Tr),while no significant different of substomatal CO2(Ci),Ls and WUE.The alter of source-sink correlation did not impact the curve of the diurnal change in the Pn,they were all showed a typical bimodal curve,the first and the second peak occurredat 8:00 and 14:00 respectively,and no "midday depression phenomenon of photosynthesis" occurred.
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