Effects of different girdling treatments on photosynthetic characteristics and fruit quality of'Jinyan'kiwifruit
[Objective]The effects of different girdling treatments on the photosynthetic characteristics of'Jinyan'kiwifruit leaves at different stages and the yield and quality of kiwifruit at maturity stage were explored,in order to screen the girdling method with excellent comprehensive performance.[Method]We measured the photosynthetic characteristics,yield and fruit quality in different periods.'Jinyan'kiwifruit was used as the test material,eight treatments were set up,including full flowering stage and 80-90 days after flowering,single-layer closed girdling and double-layer reverse unclosed girdling,with widths of 5 mm and 9 mm.Girdling was carried out at 1 m away from the ground,the cambium was cut offwithout injuring the xylem,and no girdling was used as the control(CK).The net photosynthetic rate,stomatal conductance,intercellular CO2 concentration,transpiration rate were measured at 10 d,35 d and 70 d after girdling,and fruit yield and quality were measured at maturity stage,and the effects of different treatments on leaf photosynthetic characteristics and fruit development were comprehensively analyzed.[Result]The net photosynthetic rate,stomatal conductance and transpiration rate of'Jinyan'kiwifruit leaves were significantly decreased,and the intercellular CO2 concentration was significantly increased by one-time girdling at full flowering stage,two-time girdling at full flowering stage and 80-90 days after flowering,and the negative feedback of two-time girdling on leaves photosynthesis was better than that of one-time girdling.Except T4,T7 and T8,other girdling treatments significantly increased the yield per plant of'Jinyan'kiwifruit by 11.93%-30.53% .The commodity fruit rate of T1,T3,T5 and T6 was higher than that of CK.Girdling treatment could effectively increase the single fruit weight of'Jinyan'kiwifruit by 5.19%-21.66%,significantly increase the soluble solids content of fruit by 7.89%-21.26%,and had no effect on the titratable acid content.T2,T4 and T5 significantly increased the dry matter content of fruit by 18.29%,18.29% and 22.04%,respectively.The soluble sugar content of T1-T6 was 6.80%-10.76% higher than that of CK.T1-T3 and T5 significantly increased the ascorbic acid content of fruit by 9.72%-19.44% .Based on the effects of various treatments on yield and fruit quality,T5 was the best.[Conclusion]Two-time girdling treatments at full flowering stage and 80-90 days after flowering could better meet the needs of flowering,fruit setting and fruit growth of'Jinyan'kiwifruit.Considering the effects of various treatments on photosynthetic characteristics,yield,commodity fruit rate and fruit quality,T5 was the best.
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