对稗属(Echinochloa Deauv .)常见种类〔稗 Echinochloa crusgalli (L.)Beauv .;无芒稗 E .crusgalli var .mitis
(Pursh)Peterm .;西来稗 E .crusgalli var .zelayensis (H.B.K .)Hitchc .;细叶旱稗 E .crusgalli var .praticola Ohwi;旱
稗 E .hispidula (Retz.)Nees 和光头稗 E .colonum (L .)Link〕的开花过程和节律, 温度 、光周期、晴天和阴雨天对其
中部分稗类植物开花的影响以及套袋条件下无芒稗和旱稗的结实率进行了研究。 结果表明, 不同稗类植物的开花
的过程基本相似, 从颖壳微微张口到闭合大约需 20 ～ 30 min, 但花药伸出颖壳后, 散落花粉的过程很快, 颖壳闭合后
柱头外露率达100 %。 稗类植物每穗开花持续时间较长, 一般为 20～ 25 d, 随种类的不同略有变化;稗类植物每穗每
天开花数量的变化趋势基本呈抛物线状, 每天的开花比例变化较平缓, 即使在开花高峰期, 开花数也只占总数的
10 %～ 15 %, 开花高峰期因稗草种类的不同略有变化, 但都在始花后 11 ～ 15 d 左右。 每日的开花节律为 70% ～
80 %的颖花在 7:00 之前开, 15 %～ 20 %在 7:00 -8:30 开, 8:30 之后零星开花, 10:30 尚未见开花。 温度、光周期、晴
天和阴雨天对开花都有一定的影响。 不同条件下的结实率没有明显差异。
 

The process and rhythm of anthesis of Echinochloa spp .〔 E .crusgalli (L.)Beauv .;E .crusgalli var. mitis (Pursh)Peterm .;E. crusgalli var .zelayensis (H .B .K .)Hitchc .;E .crusgalli var. praticola Ohwi .; E . hispidula (Retz .)Nees .;E .colonum (L .)Link .〕 and the effects of temperature ,photoperiod , sunshine and rainy days on anthesis of some of them were investigated .The setting rate of E . crusgalli var .mitis and E . hispidula was studied under different condition .The results showed that the anthesis process of different species was similar , with about 20 -30 min from opening to shut of glume .Pollen dispersal were very quickly after anther growing out the glumes .The rate of stigmas in out was 100 % after anthesis .The continuance of anthesis of per spica was very long , about 20 -25 d , although with slight difference among different species .The anthesis rhythm of per spica was similar to parabola with tempered changes that the percent of anthesis was about 10 %-15 % in anthesis peak period at 11 -15 d after ahthesis beginning .The daily rhythm of anthesis was that 77 % -80 % of those opened before 7 :00 , 15 %-20 % during 7 :00 -8 :30 , sporadic after 8 :30 and no anthesis after 10 :30 .Temperature , photoperiod and weather effected the daily anthesis rhythm .The setting rate had no significant difference under different condition .