不同熟性披碱草的花粉活力及柱头可授性研究

STUDY ON POLLEN VIABILITY AND STIGMA RECEPTIVITY OF DIFFERENT MATURING Elymus dahuricus Turcz.

以中熟和晚熟披碱草(Elymus dahuricus)为实验材料,采用碘-碘化钾(Z_2-KI)法和TTC法测定其花粉生活力,用联苯胺-过氧化氢法测定柱头的可授性。结果表明:(1)不同熟性披碱草的花粉活力存在差异,但其变化趋势有一定相似之处。在开花当天具有较高的花粉活力,并能维持3d^4d,花粉寿命为6d^7d,最佳传粉期为开花后1d^3d;(2)比较披碱草不同花期的花粉活力及花粉寿命发现,始花期和末花期的花粉寿命短,但盛花期的花粉寿命较长;(3)在开花当天柱头便有极强的可授性,能维持2d^3d,最佳可授期和传粉期为开花后1d^3d。

By mid- maturing and late- maturing of Elymus dahuricus for materials,its pollen viability checked by 12- KI and TTC methods,and stigma receptivity was determined by benzidine- H2O2 method.The results showed that;1） In different maturities of Elymus dahuricus,there was differences existed in their pollen viabilities,but the trend possess some similarities.At the blooming day,had higher pollen viability and could last about 3 to 4days.The life- span of Elymus dahuricus was about 6 to 7days,and the best pollination period was 1 to 3 days after blooming.2） Comparison of pollen viability and pollen life- span at different florescence found that pollen life- span was short during initial blooming period and last florescence,but had longer life- span in fully blooming period.3） Stigmas had highest receptivity at the blooming day,and could continued about 2 to 3 days.So the best period of pollination and stigma receptivity of Elymus dahuricus was 1 to 3 days after blooming.