Study On Stripe Rust And Powdery Mildew Resistance Of 86 New Wheat Lines In Guanzhong Irrigation District Of Shanxi Province

Wheat is the most widely cultivated and most important food crop.Stripe rust and powdery mildew are epidemic diseases that seriously affect wheat production in China.Planting disease-resistant varieties is the most economical and effective way to control wheat stripe rust and powdery mildew,and is conducive to environmental protection.The identification and evaluation of disease resistance of variety resources is the basic work for research on disease resistance breeding and guiding the rational layout of disease resistance genes.Therefore,the authors identified the adult disease resistance of strip rust and powdery mildew of 86 new wheat line.The experiment was conducted at the Yangling Wheat Test Base in Shaanxi Province in 2017-2018.The test materials were from 45 relevant breeding units in China.There are 86 new wheat line.The test carried out stripe rust and powdery mildew resistance identification.And analyzing the source of disease resistance genes.The main results followed as,1?In the resistance test for stripe rust in 2018,82.6% of the new wheat line identified were performing well.There are 28 lines of disease resistance in the adult stage that are immune or near immunized.There are 18 lines that are highly resistant to disease during adult stage.There are 25 lines with moderate resistance to disease resistance in adult stage.They accounted for 32.6%,20.9%,and 29.1% of the total identified materials,respectively,and the overall resistance was good.2?In the resistance test for powdery mildew in 2018,only 11.7% of the 86 new wheat line identified were performing well.There is no line of disease resistance in the adult stage that is immune or near immunized.There are 4 lines that are highly resistant to disease during adult stage.There are 2 lines with moderate resistance to disease resistance in adult stage.There are 4 lines that are moderately susceptible.They accounted for 4.7%,2.3%,and 4.7% of the total identified materials,respectively,and the overall resistance was poor.3?We use pedigree analysis and parental resistance to disease to derive disease resistance genes for varieties that are resistant to disease.It is speculated that the source of disease resistance genes of some stripe rust resistant varieties may be Zhoumai 16,Zhengmai 366,Ai kang 58,Zhoumai 22,Shaanmai 159,Xinong 3517,Xinmai 26 and Xinong 889;It is speculated that the genetic sources of some powdery mildew resistant varieties may be Aikang58,Jimai 22,Yumai 34,Zhengmai 366,Liangxing 66,Zhoumai 16,Zhoumai 18,Yumai 47 and Xiaoyan 926 A.4?I have selected 9 new wheat lines that have good resistance to both diseases.They are Shaandao198,Baojingmai166,Baojingmai718,Lingke 686,Xinong 837,Xinong 627,Xichun 519,Longmai 838 and Xinong 943.The test provides a scientific basis for the validation,layout and promotion of wheat varieties in Shaanxi Province.