长江中下游麦区279个品种(系)小麦黄花叶病抗性研究OA北大核心CSTPCD

Wheat yellow mosaic disease is one of the important diseases affecting the yield of wheat(Triticum aestivum L.)in the middle and lower reaches of the Yangtze River.In order to screen germplasm resources resistant to wheat yellow mosaic disease,the assessment of disease resistance of 279 wheat varieties from the middle and lower reaches of the Yangtze River,bred in the past 30 years,was conducted in a virus-contaminated nursery.The transmission process of resistant quantitative trait locus(QTL)in the varieties(lines)was analyzed using molecular markers linked to the major QTLs,QYm.nau-5A.1 and QYm.nau-2D,which were linked to the resistance to wheat yellow mosaic disease.Among 279 wheat varieties,62.4%showing disease resistance,of which 30 and 98 materials contain QYm.nau-5A.1 and QYm.nau-2D respectively,9 materials containing both QTLs and 37 materials having neither QTL.This result indicated the existence possibility of other disease resistant genes/QTLs.The proportion of susceptible materials is 37.6%,among which 6 and 25 materials containing only QYm.nau-5A.1 and QYm.nau-2D respectively,and 74 materials contain neither QTLs.Further analysis of the pedigree of wheat varieties(lines)showed that the QYm.nau-5A.1 was mainly derived from Xifeng and is transmitted through Ningmai 9,while QYm.nau-2D was mainly derived from Sumai 6,Yangfumai 9311 and Zhengmai 9023,among which the resistance QTL in Sumai 6 was mainly transmitted through Zhenmai 9.This study provides a theoretical support for the mining of new disease resistance genes and molecular breeding of wheat varieties resistant to wheat yellow mosaic disease in the middle and lower reaches of the Yangtze River.