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GrainGenes Reference Report: PDS-84-1334

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Reference	PDS-84-1334
Title	Virulence of Puccinia triticina on wheat in the United States from 1996 to 1998
Journal	Plant Disease
Year	2000
Volume	84
Pages	1334-1341
Author	Long DL Leonard KJ Hughes ME
Abstract	Summary: Isolates of Puccinia triticina were obtained from wheat leaf collections made by cooperators throughout the United States and from surveys of wheat fields and nurseries in the Great Plains, Ohio Valley, and Gulf Coast states in 1996, 1997, and 1998. Virulence-avirulence phenotypes were determined on 14 host lines that are near-isogenic for leaf rust resistance. We found 31 phenotypes among 277 single uredinial isolates in 1996, 56 phenotypes among 989 isolates in 1997, and 43 phenotypes among 989 isolates in 1998. As in previous surveys, regional race distribution patterns showed 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. triticina in those areas are not closely connected, suggesting that epidemics originate from localized overwintering sources
Keyword	[ Hide all but 1 of 39 ] coast collection composition disease resistance epidemics field fields genetic resistance genetic variation geographical variation great-plains host hosts of plant diseases isolate leaf rust leaf rust resistance line nurseries ohio overwintering p pattern phenotype population puccinia puccinia recondita puccinia triticina race resistance rust rust diseases rust resistance single state surveys triticum aestivum united states virulence wheat leaves

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