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Title:: Effect of Water-saving and Root-limiting Treatments on Leaves Fluorescence Characteristics and Yield and Quality of Apple

Author(s):: CAO Hui1; 2; XU Wenjuan1; ZOU Yanmei2; SHU Huairui2; (1.Key Laboratory of Biochemistry and Molecular Biology in Universities of Shandong/Weifang University，Weifang，Shandong 261061；2.National Research Center for Apple Engineering and Technology，Tai’an，Shandong 271018)

Keywords:: :water-saving; root-limiting; apple; chlorophyll fluorescence; yield and quality

Abstract:: In order to investigate the effect of brick-buring root-limiting and water-retenting water-saving technology on fruit trees in orchard，with early maturing apple varieties ‘Gala’ and late maturing varieties ‘Fuji’ in Weifang as materials，the effect of water-saving and root-limiting treatments on leaves fluorescence characteristics and yield and quality of apple in full-ruit period were studied.The results showed that，effect of water-saving treatments on leaves fluorescence characteristics and yield and quality of apple were significantly different from the control.Among them，chlorophyll content was improved，under water-saving treatments treatments.Late irrigation in full-ruit period，chlorophyll fluorescence parameters potential activity of PSII，the maximum photochemical efficiency of PSII,PSII quantum yield，apparent rate of photosynthetic electron transport，coefficient of photochemical quenching，coefficient of non-photochemical quenching were all higher than the control.This indicated that water-saving treatments improved photochemical activity of fruit，thereby increased water use efficiency and fruit quality and yield.