Cytological and Cytochemical Observation on Microspore Abortion of GMS and CMS in Kenaf (Hibiscus cannabinus L.) Cytomorphology of organogenesis in filament Microsporogenesis Comparison of Genetic Male Sterility Line and Its Allele Fertile Line in Brassica napus L. Production of the Ogura Cytoplasmic Male Sterile(CMS)Lines of ChineseCabbage-pak-choi(Brassica campestris L.ssp.chinensis var.communis)and Turnip(B.campestris L.ssp.rapifera)and Cytological Observation ofTheir Sterile Organs A Cytological Study on Microsporogenesis of Cytoplasmic Male Sterile Lines in Kenaf (Hibiscus cannabinus L.) CYTOMORPHOLOGICAL RESEARCH ON ANTHER DEVELOPMENT OF SEVERAL MALE-STERILE LINES IN BRASSICA NAPUS L. Cytological investigation on microsporogenesis of cytoplasmic male sterility in radish(Raphanus sativus L.)