Influence of Low Temperature on the Pollen Viability of Peach Flower
WANG Hua-dong et al(College of Forestry,Gansu Agricultural University,Lanzhou,Gansu 730070)
[Objective] The purpose of the research was to supply theoretical basis for enhancing the fruit-setting rate of peach.[Method] The influence of low temperature on the pollen viability of peach flower and growth status of their pollen tubes was researched through treating pollens of 5 peach varieties by low temperatures at 4,-3 and-6 ℃ and dividing periods.[Result] At-6,-3 and 4 ℃,the germination rate of 83-1 was highest,that of Wujingzaosheng was secondary and that of Zhongyou 5 was lowest.In the treatment at-6 ℃ for 7 h,the germination rates of all the varieties were as follows sequencely: Shuangxihong83-1WujingzaoshengZhongyou 5Zhongyou 7.In the 2 h of observation duration,the pollen tubes of Shuangxihong and Wujingzaosheng grew slowly,that of Zhongyou 5 and 83-1 grew slowly in the observation duration from the 1st hour to the 2nd hour,but they had a period of rapid growth in the duration from the 2nd hour to the 3rd hour.The results indicated that the pollen of Zhongyou 7 was least resistant to low temperature and Wujingzaosheng and 83-1 had stronger resistance to low temperature.[Conclusion] The influence of low temperature on the pollen germination of peach flower and growth of their pollen tubes was very obvious and there was very great difference among varieties.