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I.γ射线辐照白菜(B.Pekinensis RUPR)胚的不同发育阶段对胚及胚乳的细胞分裂和生长的影响对于白菜胚发育的辐射效应,从胚的大小、胚及胚乳细胞数目、平均细胞大小和胚及胚乳之间的差异从数量上作了研究。从合子到小球形胚的各个发育阶段,用10及20kRγ射线照射一天。采集荚果样品观察胚的大小、胚细胞数目及胚乳核数目(顶端和基部的胚乳核),选择连续石蜡切片的中间部位供测量各组织用。植物在较后发育阶段受照时,胚的纵切面及横切面直径趋向于减小。所有试验阶段,从合子到辐照后
I. Effects of different developmental stages of B.Pekinensis RUPR embryos on the cell division and growth of embryo and endosperm Radiation effects on the development of embryogenic cabbage were studied by the size of embryos, the number of embryos and endosperm cells, The differences in size and embryo and endosperm are quantitatively studied. At various developmental stages from zygote to pelleted embryos, one day was irradiated with 10 and 20 kR gamma rays. Punch samples were collected to observe the size of the embryos, the number of blast cells and the number of endosperm nuclei (apical and basal endosperm nuclei), and the midsection of consecutive paraffin sections was selected for measurement of each tissue. When plants are illuminated at a later developmental stage, the longitudinal and transverse diameters of the embryos tend to decrease. All experimental stages, from zygote to post-irradiation