VIRULENCE AND DIVERSITY OF PUCCINIA-RECONDITA F-SP TRITICI IN THE UNITED-STATES IN 1991

被引：22

作者：

LONG, DL ^{[1
]}

ROELFS, AP ^{[1
]}

LEONARD, KJ ^{[1
]}

ROBERTS, JJ ^{[1
]}

机构：

[1] USDA ARS,GEORGIA AGR EXPT STN,EXPERIMENT,GA 30212

来源：

PLANT DISEASE | 1993年 / 77卷 / 08期

关键词：

PLANT DISEASE MONITORING; RUST EPIDEMIOLOGY; WHEAT LEAF RUST;

D O I：

10.1094/PD-77-0786

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Isolates of Puccinia recondita f. sp. tritici were obtained from wheat leaf collections made by cooperators throughout the United States and from cereal rust field surveys of the Great Plains, Ohio Valley, and Gulf Coast states in 1991. Fifty-five virulence/avirulence phenotypes were found among 647 single uredinial isolates on 14 host lines that are isogenic for leaf rust resistance. The frequencies of virulence to lines with Lr24 and Lr26 during 1991 were greater than in previous years. Regional race distribution patterns again suggested that the central United States is a single epidemiological unit distinct from the eastern United States. The distinctive racial composition of collections from the Southeast, Northeast, and Ohio Valley indicate that populations of P. r. tritici in those areas are discrete, suggesting epidemics originate from localized overwintering sources.

引用

页码：786 / 791

页数：6

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