A simulation analysis of crop yield loss due to rust disease

Teng, P. S.; Blackie, Malcolm; Close, R. C.

doi:10.1016/0308-521x(77)90004-x

Cited by 44 publications

(16 citation statements)

References 6 publications

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“…The LP is often considered to be a very important component of quantitative resistance. Zadoks (1971) and Teng et al (1977) demonstrated that small changes in the LP can have a strong impact on the development of rust epidemics. The IF showed large differences among cultivars.…”

Section: Discussionmentioning

confidence: 99%

Quantitative resistance and its components in 16 barley cultivars to yellow rust, Puccinia striiformis f. sp. hordei

et al. 2006

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Sixteen barley cultivars with a susceptible infection type (IT = 7-8) in the seedling stage to an isolate of race 24 of Puccinia striiformis f. sp. hordei were planted at two locations in Mé xico. Disease severity (DS) parameters were assessed for the flag leaf and for the upper three leaves. The cultivars represented at least five levels of quantitative resistance ranging from very susceptible to quite resistant. ''Granado'', ''Gloria/Copal'' and ''Calicuchima-92'' represented the most resistant group and had an IT of 7 or 8. The cultivar · environment interaction variance, although significant, was very small compared with the cultivar variance. The disease severity parameters were highly correlated. The monocyclic parameter DS m , measured when the most susceptible cultivar had reached its maximum DS, was very highly correlated with the area under the disease progress curve (AUDPC), r being 0.98.Components of quantitative resistance were evaluated in two plant stages. In the seedling stage small cultivar effects for the latency period were observed, which were not correlated with the quantitative resistance measured in the field. In the adult plant stage the latency period (LP), infection frequency (IF) and colonization rate (CR) were measured in the upper two leaves. The LP was much longer than in the seedling stage and differed strongly between cultivars. The differences in IF were too large, those in CR varied much less. The components showed association with one another. The LP and IF were well correlated with the AU-DPC (r = 0.7-0.8).

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Section: Discussionmentioning

confidence: 99%

Quantitative resistance and its components in 16 barley cultivars to yellow rust, Puccinia striiformis f. sp. hordei

et al. 2006

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“…LP measured on young flag leaves should therefore be preferred to other components and growth stage combinations as selection criterion for PR . This is the more so as LP is the most important component of PR (Zadoks, 1971 ;Teng et al ., 1977) and because it is often associated with other components of PR .…”

Section: Discussionmentioning

confidence: 99%

Influence of development stage and host genotype on three components of partial resistance to leaf rust in spring wheat

Broers

1989

Euphytica

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Latency period (LP), infection frequency (IF) and urediosorus size (US) of leaf rust were determined on primary leaves and young flag leaves of 18 spring wheat cultivars . A large growth stage effect and a large cultivar effect on all three components were observed . Partial resistance as measured by the three components was generally better expressed in the adult plant stage than in the seedling stage . Associated variation of the components was observed : long LP, low IF and small US tended to go together . The association was not complete, cultivars with clear deviations of this association for one of the components were found suggesting the existence of at least partly different genetic factors controlling the respective components . LP measured on flag leaves gave the most reliable results and, therefore, could best be used as a selection criterion in breeding programs for partial resistance .

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“…Latency period (LP) is the most important component of PR (Shaner & Finney, 1980 ;Zadoks 1971 ;Teng et al ., 1977) . Jacobs & Broers (1989) concluded from an F1, F2 and backcross analysis that LP in spring wheat cultivars studied inherited partially recessive and acted in an additive way .…”

Section: Introductionmentioning

confidence: 99%

The inheritance of host plant effect on latency period of wheat leaf rust in spring wheat. II: Number of segregating factors and evidence for trangressive segregation in F3 and F5 generations

Broers

Jacobs

1989

Euphytica

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Three partially resistant spring wheat cultivars, with a long latency period were crossed among each other and with the highly susceptible Little Club, with a very short latency period . Parents, F3 and F5 plants have been inoculated with the leaf rust race Flamingo in the young flag leaf stage to determine the latency period .From the crosses with Little Club, it was concluded that Westphal 12A carries three, Akabozu two and BH 1146 two or three genes for a longer latency period . BH 1146 appears to carry also one hypersensitive resistance gene .Transgressive segregation occurred in crosses between partially resistant cultivars . From crosses between the partially resistant cultivars, it was concluded that the genes in Akabozu and Westphal 12A are different, while those in Akabozu and BH 1146 are at least partly different . The possibilities of accumulation of LP-prolonging genes are discussed .

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A simulation analysis of crop yield loss due to rust disease

Cited by 44 publications

References 6 publications

Quantitative resistance and its components in 16 barley cultivars to yellow rust, Puccinia striiformis f. sp. hordei

Quantitative resistance and its components in 16 barley cultivars to yellow rust, Puccinia striiformis f. sp. hordei

Influence of development stage and host genotype on three components of partial resistance to leaf rust in spring wheat

The inheritance of host plant effect on latency period of wheat leaf rust in spring wheat. II: Number of segregating factors and evidence for trangressive segregation in F3 and F5 generations

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