关键词: 叶菜型甘薯, 选育, 采摘期, 茎尖数量, 茎尖产量, 茎尖数量变异系数, 茎尖产量变异系数

Abstract: In order to improve the breeding efficiency of new lines of leafy vegetable sweet potato and explore the influence of variation coefficient on the breeding of new lines of leafy vegetable sweet potato, seven leafy vegetable sweet potato lines were used as experimental materials to study the number and yield of shoot tips and their variation coefficients among different lines at different picking times, among different picking times of different lines, and among different replicates of different lines, and the correlation analysis of characters of shoot tips and variation coefficient was carried out. The results showed that the variation coefficient of shoot tip traits of new lines of leafy vegetable sweet potato was from large to small in the order of different picking times of different lines, different lines at different picking times, and different repetitions of different lines. The variation coefficient of the yield and number of shoot tips of high and stable yield lines was generally high, but the variation coefficient between repeats was low. The yield of shoot tips of lines 2019-1-15, 2018-2-76 and 2018-2-37 was higher than that of the control variety Fushu 7-6, and the yield difference reached a very significant level （P<0.01）. There was a significant positive correlation between the number of shoot tips and the yield of shoot tips （r=0.558 9, P<0.01）, and a significant positive correlation between variation coefficient of the number of shoot tips and variation coefficient of the yield of shoot tips （r=0.668 3, P<0.01）. It was concluded that the variation coefficient played an important role in the breeding of leafy vegetable sweet potato lines. In the process of breeding new lines of high and stable yield leafy vegetable sweet potato, the new lines with a large number of stem tips could be preferentially selected, and the effects of the yield of shoot tips and its variation coefficient could be comprehensively considered. 2019-1-15, 2018-2-76 and 2018-2-37 were new lines of leafy vegetable sweet potato with relatively high and stable yields.

Key words: leafy vegetable sweet potato, breeding, picking times, number of shoot tips, yield of shoot tips, variation coefficient of the number of shoot tips, variation coefficient of the yield of shoot tips