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近十余年来,我省在选育和推广抗病良种过程中,出现某些品种抗性严重衰退甚至丧失的情况.如由外地引入的矮脚南特和农垦58品种,初时表现抗病高产,推广种植数年后,在不少地区都因发病重而被淘汰.又如本省选育的晚粳农红73和农虎6号等品种,对稻瘟病的抗病性已日趋减弱,高抗品种珍龙13在局部地区也开始发病.品种抗病性的衰退或丧失,不仅在抗病育种上,而且在稻瘟病防治研究中都是急需研究解决的重要问题. 据国内外报导,稻瘟病菌存在着不同的生理小种,而小种区系分布是决定水稻抗病性的重要因素.因此,探明我省稻瘟病菌生
In the past ten years or so, in the process of breeding and popularizing disease-resistant varieties in our province, there have been some cases of serious decline or even loss of resistance of some varieties, such as the varieties of Dantun Nante and Nongken 58 introduced from abroad, High yield and popularization of planting a few years later, due to heavy incidence in many areas have been eliminated.On the other province such as late japonica Nonghong 73 and Nonghu 6 and other varieties, the resistance to blast has been weakened, The resistant variety Zhenlong 13 also started to emerge in some areas.The decline or loss of disease resistance of varieties is not only important in disease resistance breeding but also in urgently needed research in blast disease prevention and control.According to the reports at home and abroad, There are different physiological races of Magnaporthe grisea, and the germplasm distribution of races is an important factor that determines the disease resistance of rice.Therefore,