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Enhancing the genetic diversity and durability of leaf rust resistance in durum wheat

Herrera-Foessel, Sybil A. (2007). Enhancing the genetic diversity and durability of leaf rust resistance in durum wheat. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2007:1
ISBN 978-91-576-7300-8
[Doctoral thesis]

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Abstract

The importance of leaf rust, caused by Puccinia triticina, has increased dramatically in recent years in durum wheat (Triticum turgidum ssp. durum) worldwide. Little is known on the occurrence and nature of resistance in this crop. Thirty durum wheat lines derived from the International Maize and Wheat Improvement Center (CIMMYT) were characterized for their resistance to the Mexican P. triticina race BBG/BN which was identified in 2001 and caused susceptibility of a large number of the world's durum wheat cultivars. Ten genotypes with race-specific resistance displayed low to intermediate seedling reactions to leaf rust. In the field, eight genotypes were immune and two displayed moderate levels of resistance. The slow rusting resistant lines displayed a range of disease severity responses indicating genetic diversity. The yield protection conferred by race-specific and slow rusting resistance was investigated in yield loss trials under high leaf rust pressure in the field. Race-specific resistance provided effective protection against yield losses caused by leaf rust. Yield losses for slow rusting resistant lines were higher than for immune race-specific resistant ones, but significantly lower than for the susceptible checks. Slow rusting lines with high resistance levels and reduced yield losses were identified. The slow rusting components; latent period, uredinium size and receptivity, were determined in greenhouse experiments, and associations of these components with leaf rust progress in the field were calculated. The results indicated that predominantly uredinium size contributed to slow leaf rust progress in durum wheat. The genetic basis and diversity of race-specific resistance was also determined in progenies from crosses of nine durum wheat lines with a leaf rust susceptible parent, and from intercrosses among the resistant parents. Five distinct sources of resistance were identified, four of which involved single partially, or completely, dominant genes, of which two were closely linked, and a pair of partially dominant complementary genes. Using molecular tools, the two linked genes were located on the long arm of chromosome 6B. The best slow rusting resistant lines and the five distinct race-specific resistance sources can be used for enhancing the diversity and durability of leaf rust resistance in durum wheat.

Authors/Creators:Herrera-Foessel, Sybil A.
Title:Enhancing the genetic diversity and durability of leaf rust resistance in durum wheat
Year of publishing :2007
Volume:2007:1
Number of Pages:44
Papers/manuscripts:
NumberReferences
ALLI. Herrera-Foessel, S.A. Singh, R.P., Huerta-Espino, J., Crossa, J., Yuen, J., & Djurle, A. 2006. Effect of leaf rust on grain yield and yield traits of durum wheats with race-specific and slow rusting resistance to leaf rust. Plant Disease 90:1065-1072. II. Herrera-Foessel, S.A. Singh, R.P., Huerta-Espino, J., Crossa, J., Djurle, & A., Yuen, J. 2007. Evaluation of slow rusting resistance components to leaf rust in CIMMYT durum wheats. Euphytica (accepted). III. Herrera-Foessel, S.A. Singh, R.P., Huerta-Espino, J., Yuen, J., & Djurle, A. 2005. New genes for leaf rust resistance in CIMMYT durum wheats. Plant Disease 89: 809-814. IV. Herrera-Foessel, S.A. Singh, R.P., Huerta-Espino, J., William M., Rosewarne, G., Djurle, A., & Yuen, J. 2007. Identification and mapping of Lr3 and a linked leaf rust resistance gene in durum wheat. Crop Science (accepted).
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7300-8
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:triticum durum, puccinia recondita, rusts, genetic resistance, control methods, crop yield, crop losses, genetic inheritance, genetic maps
Keywords:Triticum turgidum ssp. durum, Puccinia triticina, Puccinia recondita f. sp. tritici, genetic resistance, control, yield losses, inheritance studies, mapping.
URN:NBN:urn:nbn:se:slu:epsilon-1377
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-1377
ID Code:1303
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: Sybil Herrera-Foessel
Deposited On:08 Jan 2007 00:00
Metadata Last Modified:02 Dec 2014 10:11

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