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Using ‘Beni Shimizu' peach (Prunωpersica (L.) Batsch) trees maintained by light pruning with heavy disbudding (LP) or conventional method (CM) as heavy pruning with no disbudding 丘uitdevelopment was investigated in relation to the occurrence of reddish-pulp for four years. Fruits harvested from LP trees had a higher rate of reddish-pulp development, whereas in合uitsharvested from CM trees the percentage was low, irrespective ofthe year surveyed. LP trees resulted in greater yield compared to CM trees. Nitrogen content in the flesh of合uitswas significantly higher in LP trees than in those ofCM trees during stage 1 of fruit development. When carbohydrate concentrations in the cane and root of LP and CM trees were compared between before and after ful bloom, the former trees showed a greater decrease than the latter. Throughout fruit development, the diameter of cells in the flesh of合uits合omLP trees was significantly larger than those from CM trees. Besides, the仕uit growth rate was greater in the former than in the latter at stage 3 of仕uitdevelopment. Fruits harvested日romLP trees attained higher weight than those from CM trees. To凶 solublesolid contents of the juice in fruit harvested were significantly higher in LP lrees lhan in CM trees. ln LP trees, shoot growth ceased by the beginning of stage 2 of仕uitdevelopment, while in CM trees, shoot growth continued until stage 3. In LP trees, anthocyanin concentration in the flesh of fruit increased rapidly just before harvest. Total phenolic concentration in the flesh was higher in合uitsfrom LP trees than in those仕omCM trees throughout fruit development. Further, there was a hi屯ghe町rL-ph 巴nザ刷y りlalani 川1川 In 問1児eammOnI陥a-勾ase (PAL) activ 叶itザym合Ul此tf 仕kぬ附oωmLP trees than in those合omη1CM trees. Based on these results, the relationship between pruning levels and the occurrence of reddish-pulp in peach fruit is discussed.

Effects of Different Cultural Practice on the Occurrence of Reddish-pulp Fruit and Fruit Development in ‘Beni Shimizu’ Peach