Improved Evaluation of Wheat Cultivars (Lines) on Resistance to Puccinia striiformis f. sp. tritici Using Molecular Disease Index

被引:7
作者
Chu, Bingyao [1 ]
Yang, Lujia [1 ]
Wang, Cuicui [1 ]
Gu, Yilin [1 ]
Yuan, Kai [1 ]
Wang, Rui [2 ]
Luo, Yong [1 ]
Ma, Zhanhong [1 ]
机构
[1] China Agr Univ, Minist Agr & Rural Affairs MOA, Key Lab Pest Monitoring & Green Management, Coll Plant Protect,Dept Plant Pathol, Beijing 100193, Peoples R China
[2] China Agr Univ, Kaifeng Expt Stn, Kaifeng 475004, Peoples R China
关键词
causal agent; cereals and grains; crop type; field crops; fungi; subject areas; REAL-TIME PCR; STRIPE RUST; LATENT INFECTION; QUANTIFICATION; SOIL; CONTAMINATION; VIRULENCE; ORCHARDS; CHINA; ASSAY;
D O I
10.1094/PDIS-07-18-1158-RE
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Wheat stripe rust caused by Puccinia striiformis f. sp. tritici is one of the most destructive diseases of wheat worldwide. Sichuan Province plays an important role in interregional epidemics in China. Application of host resistance is important in disease management, and efficient approaches to evaluate resistance level are necessary to obtain useful varieties. In this study, 100 wheat cultivars (lines) growing in Sichuan were selected to evaluate their resistance to stripe rust. Field experiments were conducted with a mixture of three P. striiformis f. sp. tritici races for inoculations at seeding and adult stages in the 2014 to 2015 season and the 2016 to 2017 season. Leaf samplings were conducted four times during the latent period at early growth stage of wheat. The sampled leaves were processed to extract DNA. The DNA of both wheat and P. striiformis f. sp. tritici was quantified using real-time quantitative polymerase chain reaction, and the molecular disease index (MDI) was used to evaluate the resistance level. The area under the disease progress curve in terms of disease index (AUDPC-DI) was obtained for each studied cultivar (line) in the fields. Among the 100 studied cultivars (lines), 61% of them showed seedling resistance, and 63 and 65% showed adult resistance in the 2014 to 2015 and 2016 to 2017 seasons, respectively, based on the infection type. High consistency in resistance grouping by cluster analysis as the percentage of the studied cultivar (line) belonging to the same group based on AUDPC-DI data and based on MDI data was obtained. The correlations between AUDPC-DI and MDI from samples collected on 9 and 14 or 15 days after inoculation during the latent period were all significant at P < 0.01. This study provided a new and efficient method for evaluation of varietal resistance to wheat stripe rust.
引用
收藏
页码:1206 / 1212
页数:7
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