Heritability and Number of Genes Controlling Leaf Rust Resistance in Four Cultivars of Wheat

Bjarko, M. E.; Line, R. F.

doi:10.1094/phyto-78-457

Cited by 96 publications

(47 citation statements)

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“…The additive dominant effect (J) due to the second major gene and dominant dominant effect (l) under epistasis was positive for cross 1. Additive dominant as well as dominant domi nant epistasis for leaf rust in some wheat crosses has also been reported by [21] which coincides with the present results in case of cross 1. An addi tive/modifying action of two genes for stripe rust in a segregating generation resulted from a cross between susceptible and resistant cultivars of wheat have also been suggested [4].…”

Section: Discussionsupporting

confidence: 92%

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Assessment of genes controlling Area under Disease Progress Curve (AUDPC) for stripe rust (P. Striiformis F. Sp. Tritici) in two wheat (Triticum Aestivum L.) crosses

Irfaq

Ajab

et al. 2009

Cytol. Genet.

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Section: Discussionsupporting

confidence: 92%

“…Frequency distribution of plant population for AUDPC revealed transgressive seg regation with respect to susceptibility and resist ance in the segregating generations (F2) of all the crosses. Susceptible transgressive segregants have [21] for leaf rust and Ma et al [22] for stripe rust in wheat.…”

Section: Discussionmentioning

confidence: 99%

Assessment of genes controlling Area under Disease Progress Curve (AUDPC) for stripe rust (P. Striiformis F. Sp. Tritici) in two wheat (Triticum Aestivum L.) crosses

Irfaq

Ajab

et al. 2009

Cytol. Genet.

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“…Frequency distribution of segregating F 2 populations was not normal, but had skewed distributions which may be explained by dominance gene action that exhibited in some populations. Bjarko and Line (1988) reported that lack of discrete classes in the segregating populations of the crosses may result in low heritability due to segregation of several genetic factors. Furthermore, Bjarko and Line (1988) noted that the lack of normal distribution is a result of the presence of dominance, epistasis, and probably the linkage between resistance genes.…”

Section: Combining Ability Estimatesmentioning

confidence: 99%

“…Bjarko and Line (1988) reported that lack of discrete classes in the segregating populations of the crosses may result in low heritability due to segregation of several genetic factors. Furthermore, Bjarko and Line (1988) noted that the lack of normal distribution is a result of the presence of dominance, epistasis, and probably the linkage between resistance genes. Other progenies, the v 2 values were significantly larger than the critical v 2 value in the Table 6, indicating the involvement of more than one recessive gene conditioning resistance to CABMV.…”

Section: Combining Ability Estimatesmentioning

confidence: 99%

Genetic inheritance of resistance to cowpea aphid-borne mosaic virus in cowpea

et al. 2012

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Cowpea aphid-borne mosaic virus (CAB-MV) is a major virus disease in Uganda that causes substantial loss of the cowpea crop especially in growth and yield. The mode of gene action conferring resistance to the virus is not well understood. The objective of the study was to determine the genetic inheritance of resistance in cowpea crosses. Three susceptible (S) cowpea landraces that are commonly grown by farmers were crossed with five introduced resistant cowpea varieties in accordance with a North Carolina mating design II scheme. The F 1 , F 2 and BC 1 F 1 progenies generated were evaluated in the field together with their parents. They were then infected with two infection methods namely: by spreader-rows of S cultivar (Ebelat) and artificial inoculation of virus extracts. The results obtained showed that general combining ability (GCA) and specific combining ability (SCA) effects were significant, indicating that both additive and non-additive gene effects controlled virus infection. The results further demonstrated that the GCA effects (59.8 %) were more important than SCA effects (40.2 %) in determining virus resistance in the cowpea varieties. Utilisation of good general combiners of the varieties MU-93, IT82D-516-2, SECOW-2W and IT85F-2841 in hybridisation to improve virus resistance in cowpea crosses would be recommended. The result of this study provided an indication that CABMV resistance was conditioned by more than one recessive gene in eight populations, but also revealed resistance to be conditioned by a single recessive gene in the other seven populations. Observation of continuous distribution of progenies for severity data in the F 2 populations also confirmed significance of quantitative inheritance for CABMV resistance. Therefore, the significance of GCA effects suggests that recurrent selection could be applied to accumulate the additive genes for resistance in F 2 populations.

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“…Epidemiologically, slow rusting resistance has a lower infection rate, long incubation period and small size of uredinia and lower numbers of spores/uredinia (Caldwell 1968). Genetic studies have shown that slow rusting resistance is a quantitative and durable character and is controlled by several genes (Johnson & Law 1973;Bjarko & Line 1988;Das et al 1992).…”

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confidence: 99%

QTL mapping for adult-plant leaf rust resistance genes in Chinese wheat cultivar Weimai 8

Wang¹,

Li²,

Shi³

et al. 2015

CZECH J GENET PLANT

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Wang J., Li Z., Shi L., Zhu L., Ren Z., Li X., Liu D., Shah S.J.A. (2015): QTL mapping for adult-plant leaf rust resistance genes in Chinese wheat cultivar Weimai 8. Czech J. Genet. Plant Breed., 51: 79-85.The wheat cultivar Weimai 8 is a good source of adult-plant resistance to leaf rust in China. In order to understand the genetic background of the resistance genes, 179 F 2:3 families derived from the cross Weimai 8 and Zhengzhou 5389 (susceptible to leaf rust) were used to construct a linkage map. Results showed that there was a major QTL on chromosome 2AS, temporarily named QLr.hbau-2AS, responsible for the resistance. QLr.hbau-2AS from the resistant parent Weimai 8 was between the SSR markers Xcfd36 and Xbarc1138, with an interval length of 2.58 cM. In the 2010-2011, 2011-2012 and 2012-2013 crop seasons, it explained 25.79, 71.55 and 60.72% of the phenotypic variation, respectively. The location of QLr.hbau-2AS was close to the leaf rust resistance gene Lr37. However, they may not be the same since QLr.hbau-2AS has a different virulence test response from Lr37. This study identified two closely linked flanking molecular markers QLr.hbau-2AS and these molecular markers will help marker-assisted selection in breeding resistant cultivars in the future.

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Heritability and Number of Genes Controlling Leaf Rust Resistance in Four Cultivars of Wheat

Cited by 96 publications

References 0 publications

Assessment of genes controlling Area under Disease Progress Curve (AUDPC) for stripe rust (P. Striiformis F. Sp. Tritici) in two wheat (Triticum Aestivum L.) crosses

Assessment of genes controlling Area under Disease Progress Curve (AUDPC) for stripe rust (P. Striiformis F. Sp. Tritici) in two wheat (Triticum Aestivum L.) crosses

Genetic inheritance of resistance to cowpea aphid-borne mosaic virus in cowpea

QTL mapping for adult-plant leaf rust resistance genes in Chinese wheat cultivar Weimai 8

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