Screening Of Wheat Varieties For Resistance To BYDV

Wheat yellow dwarf is caused by Barley yellow dwarf virus(BYDV) which only transmitted by wheat aphids, causing serious economic losses to wheat. Currently, the main method to control wheat yellow dwarf disease is controlling the population of aphids by chemical insecticides, However the chemical control is expensive,and makes a potential threat to the safety of environment and food. Therefore, selecting resistant varieties is the most economical and valid method for preventing and controlling BYDV disease.In 2014~2015, we investigated the resistance to BYDV on 230 varieties and germplasm resources of wheat with the method of artificial inoculation. The disease index was used as a standard for evaluating susceptibility or resistance of varieties, and we also investigated the morbidity and output effect. The following results were obtained :The hill plot technique was adopted to identify the resistance to BYDV and we found that eight cultivars including Wumangzhong4, 00zhong13, Shan229, Xinong979, showed resistance because their disease index are 0.40, 15.47, 19.33, 20.00, The disease indexes for four new cultivars SQ203, SQ309, SQ505, SQ508 were less than twenty. While eight cultivars including Zhongguochun, Jinsui 1, Pingyuan 50, Yan9201, SQ107、 SQ104、 SQ109、 and 7182 showed high susceptibility to BYDV for their disease index are more than 50. Other varieties including Ligao 9, Zhongliang 9589 and other 20 varieties disease index are in 25 to 50 range,showed disease tolerance. Many cultivars which disease indexes are more than 50 showed that varieties of plant height, ear length are infected, tiller number and Thousand-kernal weight has a different degree of influence. Besides we also found that different resistances of wheat varieties had different impacts on the output and quality of wheat after they infected by BYDV.