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水稻品种对稻瘟病的抗性,是对某些小种而言,没有一个品种能抗所有生理小种,也没有一个小种能侵染所有品种,但品种之间抗性谱差别很大,有的品种抵抗的小种数量很少,有的则对大多数小种都能抵抗,即所谓广谱性的抗病品种.广谱性的抗病品种,尽管由于新小种的出现和小种群体组成的变化,这些品种经过一些时间之后虽也会丧失抗病性,但其抗性维持的时间较长.因此,在抗病育种中,必须选用广谱性好又能抗当地优势小种的抗源亲本,通过杂交,选育广谱性的抗病品种.为此,把新选的16个稻瘟病的抗源品种,针对本省稻瘟病菌的生理小种类型和优势小种加以分析讨论,供抗病育种选择抗源作参考.
Resistance of rice varieties to rice blast is that for some races, none of them is resistant to all races and none of races can infect all varieties, but the spectrum of resistance varies greatly between Of the species resistant to the small number of races, while others are resistant to most races, the so-called broad-spectrum disease-resistant varieties of broad-spectrum disease-resistant varieties, although due to the emergence of new races and races The composition of the population changes, although after some time these species will lose their disease resistance, but its resistance to maintain a longer time.So, in disease-resistant breeding, we must choose a broad spectrum of good and resistant to local races Of resistant parents were selected to breed a broad spectrum of resistant varieties.Therefore, the 16 newly selected resistant varieties of rice blast were analyzed against the races of races of M. grisea and the dominant races Discussion, for resistance breeding selection of anti-source for reference.