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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2014年51 No.6

Resistance of major wheat varieties to Rhopalosiphum padi (Linnaeus) in SichuanProvince
Author of the article:WEI Hui-Ting1** LI Jun2 WU Chun2 XIANG Yun-Jia1 LI Chao-Su2 YANG Wu-Yun2 TANG Yong-Lu2***
Author's Workplace:1. Institute of Plant Protection, Sichuan Academy of Agricultural Science/Key Laboratory of Southwest Crop Integrated Pest Management, Ministry of Agriculture, Chengdu 610066, China; 2. Crop Research Institute, Sichuan Academy of Agricultural Science/Key Laboratory of Southwest Biology and Genetic Breeding in Wheat, Ministry of Agriculture, Chengdu 610066, China
Key Words:wheat, Rhopalosiphum padi, aphid ratio, 1000-grain weight loss rate
Abstract:[Objectives]  To evaluate resistance levels of major wheat varieties to Rhopalosiphum padi Linnaeus inSichuanProvince, and test the consistency of resistance levels determined by aphid ratio and 1000-grain weight loss rate. [Methods]  34 major wheat varieties released after 2000 were planted in pots under cover from rain and inoculated with aphids at the booting stage. Aphid ratio was used to identify resistance levels after infection for 28 d, and the 1000-grain weight loss rate was determined after harvest. [Results]  Resistance levels of the 34 varieties varied from highly susceptible (HS) to highly resistant (HR). The number of moderately resistant (MR), low resistant (LR), low susceptible (LS), moderate susceptible (MS), susceptible (S) and highly susceptible (HS) strains were 2, 6, 11, 5, 6 and 4, respectively. The resistance levels of the Chuanmai 42 and Mianmai 45 strains were higher than those of the other varieties. The average 1000-grain weight loss rates from MR to HS were 43.6%, 58.1%, 60.3%, 68.1%, 73.5% and 77.1% respectively. The 1000-grain weight loss rate of the highly resistant variety Chuanmai 42 was 41.8% compared to 80.7% for the low resistant Neimai 836 strain. There was a highly significant correlation between aphid ratio and the 1000-grain weight loss rate, but the resistance levels of some varieties, such as Chuannong16 and Chuanmai 107, were inconsistent with their 1000-grain weight loss rate. [Conclusion]  Most major wheat varieties inSichuanwere categorized as LS with respect to resistance to Rhopalosiphum padi. Chuanmai 42 and related varieties that have exogenous genes displayed higher resistance levels than other strains. Aphid ratio with 1000-grain weight loss rate was a more accurate way of evaluating resistance.
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