摘要： 对萝卜雄性不育花进行形态学观察,发现两种类型的不育花,即花粉败育型和雄蕊萎缩型.比较研究了可育花及两种类型的不育花小孢子发育的细胞形态学特征,发现萝卜小孢子败育是个连续过程,在造孢细胞时期就已出现败育迹象.在小孢子发育过程中,绒毡层细胞出现液泡化、肥大、增生等异常现象.小孢子的败育与绒毡层细胞异常同步发生,小孢子一直停滞在单核期不再进一步发育,最终消失.另外,在正常可育小孢子发育过程中还偶尔观察到了不育花粉粒的存在.

关键词: 萝卜, 雄性不育, 小孢子发生

Abstract: Two types of male sterile flowers,pollen degenerated and stamen shrinked were found by observing the morphology in radish.Cytological observation was made,which indicated that microspore degenerat ion was a successive process.The abnormality appeared in sporogenic stage and later followed vacuoles and enlarged taptum.The single-nuclear microspores did not develop further and at last disappeared.Furthermore,sterile pollen grains were found in fertile anthers.

Key words: Radish, Male sterility, Microsporogenesis

中图分类号: 

• S631.1