~(60)Coγ射线辐照萝卜种子筛选抗黑斑病突变体
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摘要
萝卜(Raphanus sativus L.)又称莱菔,为十字花科一、二年生草本植物。萝卜为世界性蔬菜,以中国和日本栽培最为普遍,欧美栽培相对较少。萝卜由于其独特的口味和特殊的药用价值成为人们生活当中最重要的蔬菜之一。春季和秋季是萝卜黑斑病最为流行的季节,特别是近几年来萝卜受到黑斑病的危害越来越严重,而且在病害流行季节化学防治效果欠佳,因此在生产上进行抗病育种越来越迫切。
     通过辐射照射种子以后,会产生各种性状的突变,而且各种性状的突变频率不一样,而且多数为隐性突变,其显性突变频率更低。~(60)Coγ射线是近些年来常用的辐射源,具有较高的诱变率,在本课题中,为获得萝卜的显性抗病突变个体,本实验中将利用~(60)Coγ射线作为辐射源,并提高辐射剂量或延长辐照时间,提高变异率。
     本试验对黑斑病抗性单株的离体鉴定方法作了研究,利用~(60)Coγ射线对浙大长、醉仙桃、石庄白的种子进行辐照,对萝卜的辐射敏感性作了研究,在诱变1代、2代、3代进行了抗黑斑病突变体的筛选和鉴定,并对突变体筛选方法作了研究。结论如下:
     1.在抗黑斑病突变体的筛选鉴定中,室内离体点滴接种法比离体喷雾法接种更可靠,最适合的离体点滴法接种浓度为2500个孢子/ml。
     2.萝卜有很强的抗辐射能力,半致死剂量在1500—2000gray之间;萝卜各品种间的辐射敏感性略有差异。
     3.经过三代的筛选,在浙大长中筛选到了2个抗性株系,在醉仙桃中筛选到了5个抗性株系,在石庄白中筛选到了2个抗性株系。
     4.可以根据诱变2代的抗性株的比例对是否存在显性抗病突变作出估计,抗性株比例越高则存在显性抗病突变的可能性越大。
Radish (Raphanus sativus L.) ,also named as laifu ,is one kind of anual or biennial herbaceous vegetable belonging to cruciferae. It is one of the most popular and widely consumed vegetables in China and Japan. Because of its special flavor and medical use, radish becomes a very important vegetable in people's life. Alternaria brassicae is epidemic in spring and autumn, especially in recent years, and chemical prevention is ineffective sometimes. Disease resistance breeding becomes increasingly important.
    After radiation the seeds will engender some mutations in some characters. Mutants appears at different frequency when the seeds are radiated. Most mutations are recessive, while the dominant mutation frequency is definitely low. 60Co γ ray is very frequently used in radiation for its high efficiency. In this study, we aimed at obtaining dominant mutations of radish on Alternaria brassicae resistance through this strategy.
    The methods of identifying resistant mutants to Aternaria brassicae in vitro inoculating were studied. The radiosensitivity to 60Co γ ray was investigated on the seeds from three radish cultivars, Zhedachang, Zuixiantao and Shizhuangbai. Three generations of mutations, named as Ml, M2 and M3, were screened by the pathogen of Alternaria brassicae, and different screening methods were compared. The main results are as follows:
    1. It was found that the method of in vitro dropping was more stable than the in vitro spraying method in the resistant mutants screening to Alternaria brassicae. The optimal concentration of the pathogen concentration was 2500 spores per ml in the dropping inoculates.
    2. Radish is relatively insensitive to radiation, 'and the half lethal dose of 60Co γ ray was 1500-2000 gray. There was slight difference on radiation sensitivity among different radish cultivars.
    3. Two resistant lines in the cultivar of Zhedachang, 5 in Zuixiantao and 2 in Shizhuangbai were obtained after 3 generations of Alternaria brassicae screening.
    4. The proportion of resistant plant in the second generation could used to estimate the possible existence of dominant resistant mutants.
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