Fruit growth dynamics of lopsided'Korla fragrant pear'and its relationship with endogenous hormones
In this study,'Korla fragrant pear'(Pyrus sinkiangensis)was selected as experimental material,the occurrence pattern and growth dynamics of lopsided fruits were investigated,and the difference of en-dogenous hormone contents between normal fruit and lopsided one was compared.The results show that the lopsidedness of'Korla fragrant pear'was serious at 40-60 d after pollination,and the average daily growth rate of lopsided fruit was 0.335％,which was 0.235％higher than the average level,and the lopsid-ed rate reached two peaks between 30-50 d(0.136％)and 80-100 d(0.152％)after pollination.The differ-ence between the longitudinal diameter of the lopsided fruit size was the largest(4.144 mm)at 140 d after pollination,while the difference in transverse diameter gradually increased after 90 d after pollination,and the difference was the largest(2.112 mm)at 140 d after pollination.The difference of single fruit weight became significant at 40 d after pollination,and the largest difference(6.415 g)was 130 d after pollina-tion.The endogenous hormones of normal fruit and lopsided fruit size reached the maximal value 40 d af-ter pollination,during when the contents of auxin(indole-3-acetic acid,IAA)and gibberellin(GA3)of lopsid-ed fruit surface were significantly lower,respectively,than those of large and normal fruit surfaces.The difference of auxin content reached 355 and 291 ng·g-1,respectively,and the difference of gibberellin con-tent reached 67 and 60 ng·g-1,respectively.On the contrary,the abscisic acid(ABA)content of small fruit surface of lopsided fruit was significantly higher than those of large fruit surface and normal fruit surface,with a difference of 2.011 and 2.006 μg·g-1,respectively.The difference of the content of zeatin(ZT)be-tween different fruit surfaces was small,and it remained at a low level during 20-60 d after pollination.
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万方数据
