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美国曾在亚洲棉中鉴定出抗棉炭疽病的品种,近年来,又在抗棉角斑病的选育中有新的进展;几年前印度试验证明,棉根腐病菌对不同棉花品种的致病力有明显差异;我国已成功的选育出抗棉花枯萎病的品种,但对棉立枯菌在不同棉花品种致病力差异研究较少。为此,我们收集部份棉花品种,在温室条件下,测定人工病土中棉苗的病情指数,比较致病力的差异性,探索抗立枯菌基因存在的可能性。 方法:测定菌为辽阳棉苗立枯菌,致病力中等,玉米沙培养,玉米为沙子重量的25％,玉米沙含水量为25％,25℃黑暗培养
In the recent years, the United States has made new progress in the breeding of resistance to cotton leaf spot disease. A few years ago in India, it was proved that the infection of cotton root rot on different cotton varieties There are obvious differences in pathogenicity; China has successfully bred varieties resistant to Fusarium wilt, but there are few studies on the differences of pathogenicity between different cotton cultivars. To this end, we collected part of the cotton varieties in greenhouse conditions, the determination of artificial disease in cotton seedling disease index, comparing the difference in virulence to explore the possibility of anti-Rhizoctonia gene exists. Methods: The strain was identified as Rhizoctonia solani in Liaoyang. The pathogenicity was medium. Corn sands were cultured with 25% of the weight of the maize, 25% of the corn sands and 25 ℃ of darkness