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研究表明,水稻品种抗瘟性“丧失”的主要原因是稻瘟病菌优势生理小种的形成及病原物的变异,小种的变化随品种的更替而变化,这是各稻区的普遍规律。我国在1976年成立全国稻瘟病菌生理小种联合试验组以后,经过研究筛选出特特普等7个中国稻瘟病菌生理小种鉴别品种,并在全国应用,初步探明了我国稻瘟病菌生理小种的类型和分布,为水稻抗瘟育种和抗瘟品种的合理利用奠定了基础。黑龙江省是东北粳稻的主产区,但由于稻瘟病菌生理小种的复杂多变,一些抗病品种随着种植年限的延长,抗性逐渐丧失,造成病害的流行,
The results showed that the main reason of rice blast resistance and “loss” was the formation of the dominant race of M. grisea and the variation of pathogens. The variation of races varied with varieties, which was common in all rice regions law. After the establishment of a national experimental group of Magnaporthe grisea physiological races in 1976, we screened out seven identified species of Magnaporthe oryzae in China, such as Teopu, and applied them in China. The results showed that the Chinese Magnaporthe grisea Physiological race types and distribution of rice blast-resistant breeding and blast-resistant varieties laid the foundation for rational use. Heilongjiang Province is the main producing area of northeast japonica rice. However, due to the complex and changeable physiological races of some rice blast pathogens, some resistant varieties gradually lose their resistance with the prolongation of their planting years, resulting in the epidemic of diseases.