Causes and Consequences of the 1976-1977 Wheat Leaf Rust Epidemic in Northwest Mexico

Dubin, and H J; Torres, Enrique

doi:10.1146/annurev.py.19.090181.000353

Cited by 44 publications

(22 citation statements)

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“…A severe leaf rust epidemic was reported in northwestern Mexico during the 1976-1977 crop season on the bread wheat variety Jupateco 73 (Dubin and Torres 1981), probably caused by race TBD/TM (Singh 1991). An emergency fungicide control program was implemented to prevent losses.…”

Section: Yield Lossesmentioning

confidence: 99%

Global status of wheat leaf rust caused by Puccinia triticina

et al. 2011

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Leaf rust caused by Puccinia triticina is the most common and widely distributed of the three wheat rusts. Losses from leaf rust are usually less damaging than those from stem rust and stripe rust, but leaf rust causes greater annual losses due to its more frequent and widespread occurrence. Yield losses from leaf rust are mostly due to reductions in kernel weight. Many laboratories worldwide conduct leaf rust surveys and virulence analyses. Most currently important races (pathotypes) have either evolved through mutations in existing populations or migrated from other, often unknown, areas. Several leaf rust resistance genes are cataloged, and high levels of slow rusting adult plant resistance are available in high yielding CIMMYT wheats. This paper summarizes the importance of leaf rust in the main wheat production areas as reflected by yield losses, the complexity of virulence variation in pathogen populations, the role cultivars with racespecific resistance play in pathogen evolution, and the control measures currently practiced in various regions of the world.

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Section: Yield Lossesmentioning

confidence: 99%

Global status of wheat leaf rust caused by Puccinia triticina

et al. 2011

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“…Leaf rust of wheat (Triticum aestivum L.), which is incited by Puccinia triticina Erikss., can become epidemie and severely reduce wheat yields (Dubin and Torres 1981). The disease is usually controlled by the use of cultivars that have major genes for resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, this kind of resistance has seldom been durable because the pathogen has the ability to acquire virulence by mutation or other means and render previously resistant cultivars susceptible (Statler 1985). This ability of the pathogen to change, coupled with a capacity to increase rapidly and to become widely distributed, makes leaf rust among the most potentially damaging diseases of wheat (Dubin and Torres 1981).…”

Section: Introductionmentioning

confidence: 99%

Inheritance of virulence ofPuccinia triticinaculture X47, the F1 of the cross 71-112 x 70-1

Statler¹

2000

Canadian Journal of Plant Pathology

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Cultures 71-112 (SBD) and 70-1 (BBG) of Puccinia triticina were purified, crossed, and the resulting F, culture X47 (LBB) was selfed to study the inheritance of virulence on several near-isogenic lines of Triticum aestiviw. The phenotype of the parents, the F,, and ratios of F 2 progeny were used to explain the inheritance of pathogenicity, Results of the F 2 segregation from the reciprocal cross (70-1 x 71-112), labeled X59 (CBB), were compared to results of the current study. The F 2 cultures in this study segregated as if single dominant genes conditioned avirulence on near-isogenic lines with Lr2a, Lr2c, LrlO, Lrl 7, Lr28, Lr29, and Lr33. The avirulence genes were independently inherited. Linkage was detected between pathogen genes p2a and p2c with p29. Two genes appeared to control virulence on near-isogenic lines with Lr3, Lr3c, Lrl I, Lrl6, Lr21, Lr26, and Lr30. The F 2 ratios could be explained by classical gene-for-gene interactions except for the digenic ratios, which may indicate a more complex interaction.Résumé : Les cultures 71-112 (SBD) et 70-1 (BBG) du Puccinia triticina furent purifiées, croisées et la culture Fl resultante, X47 (LBB), fut autofécondée pour étudier la transmission de la virulence sur plusieurs lignées quasiisogéniques du Triticum aestivum. Le phénotype des parents, les F, et les ratios de segregation de la descendance en F 2 ont été employés pour expliquer la transmission de la pathogénicité. Les résultats de la segregation en F 2 des croisements réciproques (70-1 x 71-112), étiquetés X59 (CBB), furent compares aux résultats de la présente étude. La segregation des cultures en F 2 dans cette étude s'est faite comme si les gènes dominants simples avaient conditionné l'avirulence des lignées quasi-isogéniques avec Lr2a, Lr2c, LrlO, Lrl7, Lr28, Lr29 et Lr33. Les gènes d'avirulence furent hérités de facon indépendante. Une liaison génétique fut détectée entre les gènes p2a et p2c de l'agent pathogène dans p29. Deux gènes semblaient contröler la virulence sur les lignées quasi-isogéniques avec Lr3, Lr3c, Lrl 1, Lr 16, Lr21, Lr26 et Lr30. Les ratios de segregation de la F 2 pouvaient être expliqués par des interactions classiques gêne pour gêne, excepté pour les taux digéniques, ce qui peut être l'indication d'une interaction plus complexe,

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“…Unfortunately, this kind of resistance has not always been durable because the pathogen has the ability to acquire virulence by mutation or other means and render previously resistant cultivars susceptible (Statler 1985). This ability of the pathogen to change, coupled with a capacity to increase rapidly and to become widely distributed makes leaf rust among the most potentially damaging diseases of wheat (Dubin & Torres 1981). Levels of heterozygosity in P. recondita are very important if most changes to virulence in the fungus are due to mutations.…”

Section: Inheritance Of Virulence Ofmentioning

confidence: 99%