催芽温度对紫色马铃薯种薯萌芽、 植株生长和结薯大小分布的影响.

[Objective] This paper aimed to study the effects of germination temperature on potato production and tuberization. [Method] At Jintang county of Sichuan, three germination temperature levels such as 1.5, 10-15 (room temperature) and 20°C, were used in this experiment before sowing. [Result] With the increasing of germination temperature, the germination speed of seed potato increased. At the end of germination, the bud diameter, bud length and bud number of treatment room temperature and 20°C were significantly higher than that of treatment 1.5°C,. During the sprouting period of seed tuber, ABA content was a decreasing trend, and the descending speed was faster with the increasing of germination temperature, but the content of IAA, CTK and GA increased totally during the sprouting period of seed tuber. After seedling, the higher germination temperature was, the more stem number was, and the lower stem diameter. At the early growth stage, the plant height increased with the increasing of germination temperature while at the later growth stage, the plant height was opposite. Compared with treatment 1.5°C , the fresh yield of treatment of room temperature and 20°C, was increased by 15. 3 % and 15. 6 % while the tu-ber number per plant of that was increased bv 18. 8 % and 23. 9 % , respectively. At the same lime, I lie proportion of tuber that≥90 g decreased, and the proportion of 30 -60 g tuber increased, but there was no significant effect on commodity potato rate. [Conclusion] Properly increasing the germination temperature of purple potato before sowing would improve the population number, increase tuber number and yield, and change the tuber size distribution. [ABSTRACT FROM AUTHOR]