多效唑和赤霉素对小麦不育系柱头生活力的影响

在杂交小麦制种区,进行以不同浓度多效唑拌种为主区,叶面喷施赤霉素为副区的裂区设计试验,研究2种激素对不育系柱头生活力的效应。结果表明:与对照相比,不育系多效唑拌种,柱头平均增长1.76%~7.92%,柱头外露率提高0.39%~5.03%,颖壳张开角度增大5.41%~16.07%,从而显著提高异交结实率,在此基础上喷施赤霉素进一步提高柱头生活力的效果不显著;多效唑拌种,使不育系的柱头生活力高峰期提前3~4 d,但不能延长柱头授粉的持续时间。多效唑拌种各处理以120 g/hm2最佳,异交结实率可达到55.87%。

Effect of MET and GA3 on Stigma Viability in Male Sterile Line of Wheat

To study the effect of two kinds of hormones on viability of stigma of the malesterile line,we carried out the split-plot design experiment,according to the successful experience of the hybrid rice seed production about using the hormone,in which MET in seed dressing of different concentration was the main plot,and spurting GA3 was the split plot.The results showed that it could enhance the viability of stigma obviously by MET in seed dressing,thus could improve the outcrossing rate,because it could increase stigma length 1.76%-7.92%,stigma exsertion rate 0.39%-5.03% and angle of grain husk 5.41%-16.07%.However,further application of GA3 could not raise the viability of stigma;MET in seed dressing could also make the peak of stigma viability 3-4 d in advance,but could not lengthen the duration of pollination.120 g/ha was the best concentration for MET in seed dressing,and over 55.87% of outcrossing rate was obtained in the hybrid seed production.