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Effect of Temperature on the Development of Peach Flower Organs

Shen Yuanyue1,Guo Jiaxuan1,Liu Chenglian1,and Jia Kegong2 (Department of Horticulture,Laiyang Agricultural College,Shandong 265200;2China Agricultural University,Beijing 100094)  
The effect of day/night temperature on Early flat peach flowering was studied.The results obtained from this experiment were as follows.Temperature significantly effected on the development of peach flower buds from external morphology to internal structure.The higher the temperature was,the faster the flower buds developed,and the earlier they flowered.But,high temperature should inhibit the development of flower buds,and caused high temperature injury to them when the temperature went beyond an appropriate range.The full bloom periods of 25/15 and 30/15 treatments were five and eight days earlier respectively than that of 20/15 treatment.Most of the flower buds of 35/15 treatment stopped development soon after appearing calyx,could not flower normally and shed.There was no significant difference between 20/15 and 25/15treatments in the size of flower and flower anther,the length of filament and pistil,the diameter of ovary.The treatment of 30/15 significantly inhibited the size of flower,stamen and ovary.Flower anthers could not dehisce.With rise of temperature,the development of pollen speeded up,the abortive trend of stamen increased.Compared with 20/15 treatment,the amount of pollen of 25/15 and 30/15 treatments decreased 54% and 86% respectively;the germination percentage of pollen decreased 29% and 78% respectively;the percentage of blighted pollen increased respectively 2 and 5.8 times. 35/15 treatment affected the normal meiosis and caused all stamen abortion.
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