Virulence of wheat yellow rust races and resistance genes of wheat cultivars in Ecuador

Virulence factors of the yellow rust, Puccinia striiformis, populations in bread wheat were studied in Ecuador between 1973 and 2004. The number of virulence factors has increased markedly from very few in the early seventies to 16 at the end of the 90s. Isolates belonging to race 0E0 seem to be the...

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Main Authors: Ochoa L., José, Danial, Daniel L., Paucar, Betty
Format: Artículos
Language:en
Published: 2017
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Online Access:http://repositorio.iniap.gob.ec/handle/41000/4378
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spelling ir-:41000-43782018-03-27T18:49:31Z Virulence of wheat yellow rust races and resistance genes of wheat cultivars in Ecuador Euphytica 153:287-293 Ochoa L., José Danial, Daniel L. Paucar, Betty TRIGO TRITICUM ROYA AMARILLA PUCCINIA STRIIFORMIS HONGOS RESISTENCIA CUANTITATIVA RESISTENCIA DE PLÁNTULA Virulence factors of the yellow rust, Puccinia striiformis, populations in bread wheat were studied in Ecuador between 1973 and 2004. The number of virulence factors has increased markedly from very few in the early seventies to 16 at the end of the 90s. Isolates belonging to race 0E0 seem to be the ancestor of a rapid virulence evolution of yellow rust in Ecuador. This evolution can be explained by a single step mutation pattern. Virulence to the resistance genes Yr1, Yr2, Yr2+, Yr3V, Yr3ND, Yr4+, Yr6, Yr6+, Yr7, Yr7+, Yr9, Yr9+, Yr11, Yr12, Yr18, Yr24, Yr26 and those in the cultivars Carstens V (YrCV) Strubes Dickkopf (YrSD), Suwon92/Omar (YrSU), Spaldings Prolific (YrSP), Anza (YrA+) and Selkirk (YrSK). was identified. Virulence to Yr5, Yr8, Yr10, and Yr15 was not found. Postulation of resistance genes at the seedling stage of 14 Ecuadorian wheat cultivars indicated that these cultivars carry alone or in combinations the resistance factors Yr1, Yr2, Yr3, Yr6, Yr9 and/or other undesignated resistance factors. Yellow rust evolution in Ecuador has been associated with deployment of these resistance genes. None of these deployed Yr resistance genes are effective to the present yellow rust population in Ecuador. 2017-06-14T14:05:37Z 2017-06-14T14:05:37Z 2007-02 Revista Artículo *EC-INIAP-BEESC-MGC. Quito (INIAP/CD144) http://repositorio.iniap.gob.ec/handle/41000/4378 en p. 287-293 application/pdf E. E. Santa Catalina
institution INIAP
collection Repositorio INIAP
biblioteca Biblioteca INIAP
language en
format Artículos
topic TRIGO
TRITICUM
ROYA AMARILLA
PUCCINIA STRIIFORMIS
HONGOS
RESISTENCIA CUANTITATIVA
RESISTENCIA DE PLÁNTULA
spellingShingle TRIGO
TRITICUM
ROYA AMARILLA
PUCCINIA STRIIFORMIS
HONGOS
RESISTENCIA CUANTITATIVA
RESISTENCIA DE PLÁNTULA
Ochoa L., José
Danial, Daniel L.
Paucar, Betty
Virulence of wheat yellow rust races and resistance genes of wheat cultivars in Ecuador
description Virulence factors of the yellow rust, Puccinia striiformis, populations in bread wheat were studied in Ecuador between 1973 and 2004. The number of virulence factors has increased markedly from very few in the early seventies to 16 at the end of the 90s. Isolates belonging to race 0E0 seem to be the ancestor of a rapid virulence evolution of yellow rust in Ecuador. This evolution can be explained by a single step mutation pattern. Virulence to the resistance genes Yr1, Yr2, Yr2+, Yr3V, Yr3ND, Yr4+, Yr6, Yr6+, Yr7, Yr7+, Yr9, Yr9+, Yr11, Yr12, Yr18, Yr24, Yr26 and those in the cultivars Carstens V (YrCV) Strubes Dickkopf (YrSD), Suwon92/Omar (YrSU), Spaldings Prolific (YrSP), Anza (YrA+) and Selkirk (YrSK). was identified. Virulence to Yr5, Yr8, Yr10, and Yr15 was not found. Postulation of resistance genes at the seedling stage of 14 Ecuadorian wheat cultivars indicated that these cultivars carry alone or in combinations the resistance factors Yr1, Yr2, Yr3, Yr6, Yr9 and/or other undesignated resistance factors. Yellow rust evolution in Ecuador has been associated with deployment of these resistance genes. None of these deployed Yr resistance genes are effective to the present yellow rust population in Ecuador.
author Ochoa L., José
Danial, Daniel L.
Paucar, Betty
author_facet Ochoa L., José
Danial, Daniel L.
Paucar, Betty
author_sort Ochoa L., José
title Virulence of wheat yellow rust races and resistance genes of wheat cultivars in Ecuador
title_short Virulence of wheat yellow rust races and resistance genes of wheat cultivars in Ecuador
title_full Virulence of wheat yellow rust races and resistance genes of wheat cultivars in Ecuador
title_fullStr Virulence of wheat yellow rust races and resistance genes of wheat cultivars in Ecuador
title_full_unstemmed Virulence of wheat yellow rust races and resistance genes of wheat cultivars in Ecuador
title_sort virulence of wheat yellow rust races and resistance genes of wheat cultivars in ecuador
publishDate 2017
url http://repositorio.iniap.gob.ec/handle/41000/4378
_version_ 1635512262005358592
score 11,871979