Virulence analysis of sexual progeny of the wheat stripe rust pathogen recovered from wild barberry in Shaanxi and GansuChinese Full TextEnglish Full Text (MT)
LI Qiao;QIN Jian-feng;ZHAO Yuan-yuan;ZHAO Jie;HUANG Li-li;KANG Zhen-sheng;State Key Laboratory of Crop Stress Biology for Arid Areas,College of Plant Protection,Northwest A＆F University;
Abstract: Wheat stripe rust is one of the most destructive wheat diseases in China and frequently resulted in serious yield loss in wheat production. Growing resistant wheat cultivars is considered as the most economic,effective,and environmental-friendly approach for controlling the disease. However,the resistance of wheat cultivars was overcome by emergence of newraces of Puccinia striiformis f. sp. tritici（ Pst）,the causal fungus of wheat stripe rust,within a fewyears after release of the resistant cultivars. Previous studies demonstrated that the loss of resistance of wheat cultivars resulted from emergence of newrust races due to virulence variation of the pathogen. In recent years,as the discovery of barberry（ Berberis spp.） serving as alternate host for Pst,we firstly reported that Pst completes its sexual reproduction on wild barberry under natural conditions in China. Our objectives in this study were therefore to isolate Pst samples from naturally infected Berberis,establish their singleuredium populations,test their virulence based on the differential set,and analyze virulence characteristics of their single-uredium populations. We isolated 8 Pst samples from 3 Berberis spp. collected from Gansu and Shaanxi provinces in 2015. Based on their virulence tests and analyses,only one Pst sample was matched to the known Pst race Su11-126 in virulence patterns,and the remaining 7 were newraces. Out of 93 isolatedsingle-uredium populations that produced 47 virulence patterns including 14 known race types and 33 newrace types,fifty-six were matched with the known Pst races in virulence patterns and 37 were new. In this study,we obtained more evidences for supporting the existence of sexual reproduction of Pst on Berberis spp. under natural conditions in China,which led to the generation of newraces of the pathogen. Our results confirmed that wild Berberis spp. play a role in completion of the whole life cycle of Pst and in disease cycle of wheat stripe rust in China.
- DOI：
10.13926/j.cnki.apps.2016.06.011
- Series：
- Subject：
- Classification Code：
S435.121.42
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