摘要
为探究不同玉米自交系花丝活力及其结实性动态变化规律.以玉米自交系'浚696'、'浚573'、'浚503'、'郑58'和'昌7-2'为试验材料,测定花丝日吐丝长度和吐丝量、不同日龄花丝结实率和穗部性状等相关指标.结果显示不同自交系花丝日吐丝长度和花丝结实率均是先增后降;花丝日吐丝长度峰值在吐丝第2～3天;结实率峰值在吐丝第3～5天.花丝日吐丝量呈'快-慢'的增长模式,吐丝第1～3天快速增长,'浚696'花丝总量最少,'昌7-2'花丝总量最多.授粉后第8天的小花受精率和总结实率均比第5天高,'郑58'的小花受精率最大、'浚696'的总结实率最高.'浚696'、'浚573'和'浚503'不同日龄花丝结实率与其穗部各性状、日吐丝量和吐丝长度均呈显著或极显著正相关.研究结果为明确自交系花丝活性时间、掌握最佳授粉时期、提高自交系结实性和制种产量提供理论依据.
Abstract
The aim was to investigate the dynamic changes in filament vitality and seed setting of different maize inbred lines.This study used maize inbred lines'Xun 696','Xun 573','Xun 503','Zheng 58'and'Chang 7-2'as experimental materials to measure relevant indicators such as daily filament length and quantity,filament setting rates and ear traits at different days.The results showed that the daily filament length and filament setting rate of different inbred lines increased first and then decreased;the peak of the daily spinning length of the flower silk was on the 2nd to 3rd day of spinning;the peak setting rate was on the 3rd to 5th day of silk spinning.The daily filament amount showed a'fast-slow'growth pattern,with a rapid growth from the 1st to the 3rd days.The total amount of'Xun 696'filament was the smallest,and the total amount of'Chang 7-2'filament was the largest.On the 8th day after pollination,the fertilization rate and total fruiting rate of small flowers were higher than that on the 5th day,with'Zheng 58'having the highest fertilization rate and'Xun 696'having the highest total fruiting rate.The fruiting rate of silk at different days of age in'Xun 696','Xun 573',and'Xun 503'was significantly or extreme significantly positively correlated with various traits of their panicles,daily silk production,and silk production length.The research results provide a theoretical basis for clarifying the active time of the filaments of inbred lines,mastering the optimal pollination period,improving the seed setting and seed production yield of inbred lines.
维普
万方数据