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Postulation of Stripe Rust Resistance Genes in Chinese Commercial Wheat Varieties and Parasitic Fitness of a New Race in China

Author: ZuoDanDan
Tutor: ChenWanQuan
School: Jilin Agricultural University
Course: Plant Pathology
Keywords: Wheat Stripe rust Gene postulation Identification of adult plant resistance Parasitic fitness
CLC: S512.1
Type: Master's thesis
Year: 2011
Downloads: 29
Quote: 1
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Abstract

Wheat stripe rust, caused by the the strip PUCCINIA wheat biotypes (Puccinia striiformis f.sp.tritici) the many pandemic in the country, a serious threat to the safety of China's wheat production. The cultivation and use of resistant varieties is an economic, safe and efficient prevention and control strategies. In our country due to the large area of ??the single species of the resistance gene, so that the new race, resulting in \Is now the major anti-rust resistance gene Yr26 toxic new species appear to constitute a potential threat posed to some regions of China, and even the prevention and control of national wheat stripe rust, while production varieties carry resistance to stripe rust resistance gene is unclear, If the the new toxicity race to become the dominant species, may cause in some wheat varieties resistant \Therefore clarify cultivars carrying stripe rust resistance genes and strip rust new species of parasitic fitness situation, forecast for wheat stripe rust, targeted cultivation of resistant varieties, the rational distribution of the resistance gene has an important guiding significance. This selection of 21 different toxicity profile from home and abroad with wheat stripe rust Department derivation of stripe rust resistance gene analysis of 115 wheat varieties. The results show that the deduced Yr1, anti-rust resistance gene or combination of genes in the test known in Yr2 Yr6 Yr2 YrH Ⅶ Yr3 YrND Yr4 YrH46 Yr5 Yr6 Yr8, Yr9, Yr10, Yr12, Yr15, Yr17 Yr26, Yr27, Yr25 YrSD, YrSu 17 genes, distributed in a single gene or combination of genes in the form of 78 wheat varieties. Yumai 18 7 varieties contain Yrl; Stone 4185 36 the varieties contain Yrl and Yr9 the most varieties to contain Yrl and Yr9 containing both other known or unknown stripe rust resistance gene, contained known genes Yr2 YrH Ⅶ and the Yr8 etc.; Long 6878 and Long 4640 may contain Yr2 YrH Ⅶ; to the Jinan 17 containing Yr3 YrND; the Yr2 Yr6, the the Chuannong 19 contains; the blue days 18 containing Yr4 YrH46; the Lantian No. 22 may contain Yr5 or YrlO; Chuanmai 42 and Lantian 17 the number containing Yr26, Yr26 or cultivars, Yr10 was Yrmor of beam 200,192 and may contain beam 99293; the the Zhengnong 16 and 54 Jinmai may contain Yrl2; Xiaoyan 22 four varieties contain Yr25 YrSD; Lantian 21 7 varieties contain Yr15; Yr27 existence of Wanmai 19 6 varieties; to contain Yr6 Chuanmai 39; Luohan 2 Ping No. 6 has Yrl 7; the excellent 503 3 varieties contain YrSu. Use rust races CYR32 CYR33, V26 (the strains Code, Yr26 toxic new strain) identification of resistance of the adult stage races. The combined seedling stage identification results show that 13 varieties of weeks Mai 17, Lumai No. 1 CYR32, CYR33, V26 showed the whole growth period of resistance; Yumai 34 five varieties showed adult plant resistance; Lumai 23 Jinmai 54, Shaan 229 showed slow rust. Overall, the current Chinese wheat cultivars overall resistance to stripe rust resistance level is still low. From different wheat growing areas large area planted with six varieties Mingxian 169 as the control, use of resistant components studied Chinese wheat stripe rust mainly small species CYR32, the CYR33 and new race V26 in all varieties of seedlings The period of relative parasitic fitness. Each species - small combinations measured nine parasitic fitness parameters. These attributes use SPSS16.0 software multivariate analysis of variance, the results show that there was no significant difference between the three parameters of species and varieties of the foliar spore germination rate; the Souchong between the piebald number three parameters were no significant differences However, the differences between varieties significantly; no significant difference between the sporulation of three parameters varieties, but small interspecific differences significantly. 9 of parasitic fitness parameters of principal component analysis, results show that the expansion and sporulation capacity measure strip rust races the most important attributes of parasitic fitness by summer spore germination rate, latent period, lesion expansion speed , sporulation strength, summer spores bulk density, sporulation period decision. Followed by infection capabilities, the main by piebald number, the the infection probability urediniospores heap length determines. Comprehensive Evaluation CYR32 CYR33 and V26 relative parasitic fitness, to CYR32 higher, followed by the V26, again CYR33, preliminary indication of the competitiveness has become the dominant species in the V26.

Postulation of Stripe Rust Resistance Genes in Chinese Commercial Wheat Varieties and Parasitic Fitness of a New Race in China

Abstract

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