抗稻瘟病(Piricula oryzae)突变体的诱发和筛选研究

STUDY ON INDUCTION AND SELECTION OF MUTANTS FOR BLAST DISEASE (Piricula oryzae) RESISTANCE

用60_Coγ射线15,25和35krad分别处理感稻瘟病水稻品种(系)浙粳66和R_8617,经M_2代稻瘟病区自然诱发筛选,并经后代人工接种鉴定,在M_2代中分别选到抗病变异单株30、34和36株。不同剂量处理后的变异率分别为0.016％、0.019％和0.316％。经M_4代进一步人工接种鉴定,除个别株系抗性较差外,多数变异产生的抗性是可遗传的。用不同稻瘟病生理小种接种鉴定发现,不同抗病突变系的抗谱有较大的差异。

The rice seeds of varieties Zhejiang 66, R8817 which were blast disease susceptible were treated by 15, 25, 35, krad 60Co-γ rays, and the disease resislant rice plants were selected in M2 generation with natural induced inoculation.The disease resistant plants selected from M2 were inoculated artificialy. 30, 34,36 of variant plants were selected in the M2 generation and their mutation rate were 0.016, 0.0190, 0.316 percent respectively.The resistance for most of mutants can be hereditary.The disease resistance mutants from same parents with same treatment showed different resistance.