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1986年在甘蓝型油菜萝卜细胞质雄性不育系的测交后代中,发现半不育植株;经回交和定向选择,选育出N_(26)不育材料。N_(26)不育材料花的特征仍保持萝卜质不育系的花瓣特征,但不育性不同于萝卜质不育系。初步研究结果表明;N_(26)不育材料的不育性受温度影响,在一段时间里,当日平均气温高于12℃,该材料表现为不育;当日平均气温低于12℃,该材料则开半不育和可育花。N_(26)不育材料的遗传属核质互作类型,细胞核内可能有两对隐性基因控制不育性。本文对N_(26)不育材料的利用进行了探讨,但没有研究N_(26)不育材料细胞质与萝卜质不育系细胞质的异同。
Semi-sterile plants were found in the tested progeny of cytoplasmic male sterile lines of radish Brassica napus in 1986; N_ (26) sterile materials were selected by backcrossing and directional selection. The flower characteristics of N_ (26) sterile material still maintained the petal characteristics of the radish CMS line, but the sterility was different from that of the radish CMS line. The preliminary results showed that the sterility of N_ (26) sterile material was affected by temperature. During the period, the average daily temperature was higher than 12 ℃, and the material was sterile. When the average daily temperature was lower than 12 ℃, Then open half sterile and fertile flowers. The inheritance of N_ (26) in sterile material is of the type of nuclear matter interaction, and two recessive genes in the nucleus may control sterility. In this paper, the utilization of N_ (26) sterile material was discussed, but the similarities and differences between cytoplasm of N_ (26) sterile material and cytoplasm of radish sterile line were not studied.