新型小麦胞质不育系花粉败育的细胞学观察

观察了１种新型小麦细胞质雄性不育素（ＣＭＳ）－（野生二粒小麦）中国春ＣＭＳ花药和花粉败育的细胞学过程，结果表明；（１）不育系在小孢子发育至单核晚期以前，除了雄蕊心皮化发生率（３７．２％）较高外，其花药和花粉发育绝大多数与同核保持系相似，是正常的，仅少量表现异常而导致败育，异常现象主要有：雄蕊心皮化。药室合并，药壁组织喙状突起，绒毡层异常，小孢子母细胞粘连，减数分裂异常，小孢子异常等。（２）不育系花

A CYTOLOGICAL OBSERVATION ON POLLEN ABORTION IN A NEW TYPIC CYTOPLASMIC MALE-STERILE WHEAT

Anther and pollen abortion in male-sterile wheat('cs' ) having Triticum dicoccoides-nudigl cytoplasm were studied in this paper. The results obtained were summarized as follows. (l ) Before later stage of uninucleate, 37.2 percent of stamen were pistillody,except it,most of the microspore and anther of male-sterile line developed in the similiar manner to that of maintainer line,and only a few of them revealed various abnormalities and led to the abortion. (2) Pollen abortion in male-sterile line might occurin various stages of microsporogenesis. However,most of pollen in male-sterile line degenerated at later uninucleate stage,so that the microspores at this stage failed to carryon the male gametogenesis in many cases.