Fruit Growth and Development of Peach (Prunus persica L.(Batsch)) CVS. Flordared and Ang Khang White.

Abstract

Fruit growth and development of Flordared and Ang Khang White peaches conducted at Ang Khang Station from December 1979 to June 1980. It was shown that fruit growth and developmental period of Ang Khang White peach (local variety) took longer time than Flordared (the introduced variety). Flordared peach flowered later but the fruits could be harvested 45 days earlier than Ang Khang White peach. Pit harding stage began when the fruits were about 2 months ols in Flordared peach while in Ang Khang White this pit hardening stage was found in the fruits 3 months after full bloom. The periods involved during pit hardening stage were 26 days in Flordared and 64 days in Ang khang White. A double sigmoidal growth curve was found in both fruit diameter and fruit fresh weight, but the increase in fruit dry weight appeared to follow a single sigmoidal pattern. Flesh of the fruit, endocarp and seed appeared to compete for assimilates throughout fruit development. The fresh weight of endocarp and seed was rapidly increased in the first stage until the pit hardening stage after that growth rate of endocarp and seed was very slow while the rate of fruit flesh rose rapidly till harvest.