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Effects of pollination on kiwifruit development and seed number

YAN Yongqi;CHEN Cheng;LIU Jixiang;WAN Chunyan;JIANG Shuiping;Zhenjiang Institute of Agricultural Sciences of Jiangsu Hilly Area;  
【Objective】Effect of pollination concentration and time on size,quality and fruit setting of kiwifruit ‘Miliang-1' were analyzed.【Method】Longitudinal diameter,transverse diameter and lateral diameter of ‘Miliang-1' kiwifruit were tested under different pollen suspension dilution times(200,400,800 and 1 200 times)and different pollination dates(0,1,2,3,4 days after flower opening).Quality indexes(including fruit weight,soluble solid content,fruit firmness and seed number per fruit)and fruit setting ratio were also tested.Development pattern of kiwifruit was studied and flowering frequencies of‘Miliang-1',‘Xuxiang'and ‘Jinkui'were compared to find out the relationship of seed number per fruit with weight of single fruit and pollen suspension dilution times.【Result】(1)In the early period of fruit development,kiwifruit expanded rapidly,while longitudinal diameter,transverse diameter and lateral diameter of‘Miliang-1'kiwifruit increased slowly in the late stage.Female flowers opening times of the three kiwifruitvarieties were 4-5 days.‘Miliang-1' was the first,followed by ‘Xuxiang' and ‘Jinkui'.(2)Either when fruits were picked or after ripening,with the increase of pollen suspension dilution time,longitudinal diameter,transverse diameter,lateral diameter of‘Miliang-1'kiwifruit had a downward trend,furit weight decreased and soluble solids contents increased firstly and then decreased in generally.However,pollen suspension dilution time had no significant effects on fruit firmness.Excep 800 dilution times,fruit setting rate of all other treatments were above 80%.(3)Either when fruits were picked or after ripening,with the delay of pollination date,longitudinal diameter,transverse diameter and lateral diameter of‘Miliang-1'kiwifruit had a downward trend,fruit weight and soluble solids contents decreased in general.While pollination date had no significant effects on fruit firmness.Except pollination 2 days after flower opening,fruit setting rate of all other treatments were above 95%.(4)There was a significant linear positive correlation between seed number per fruit and fruit weight.【Conclusion】This study suggests pollen suspension dilution times of 200 to 400 times,0-2 days after female flowers opening,and when more than 75% female flowers have opened for kiwifruit variety ‘Miliang-1'.
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