Inheritance of Leaf Rust Resistance in Wheat Cultivars Morocco and Little Club

Ali, Ijaz; Ap, Roelfs; Huerta-Espina, J

doi:10.1094/pd-78-0383

Cited by 6 publications

(4 citation statements)

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“…The main portion of total variance in all studied crosses was mainly due to the genetic variance (Table 4); this reflected the high estimates of broad sense heritability and the expected genetic advance under selection in most crosses. These findings are in agreement with those reported by (Ali et al, 1994), (Yadav et al, 1998), (Ageez and Boulot 1999), (Zhang et al, 2001), (Hammad 2003) and (Ragab 2005).…”

Section: Discussionsupporting

confidence: 93%

Inheritance of Adult Plant Stripe Rust Resistance in Wheat Cultivars Giza160 and Giza168

Shahin

Ragab

2015

Journal of Plant Protection and Pathology

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This investigation was carried out at the experimental farm of Sakha Agricultural Research Station, during wheat growing seasons from 2009 to 2011. The objectives were to study the inheritance of adult plant resistance to stripe rust Puccinia striiformis f. sp. tritici [Pst] in the two Egyptian bread wheat cultivars Giza160 and Giza168 and identification of the most effective Yr genes under study. Two Egyptian wheat cultivars (Triticum aestivum L.) i.e., Giza168 (resistant) and Giza160 (susceptible) to strip rust were crossed to four monogenic lines (Yr's) i.e., Kalyansona, Lee, Compair, and Jupateco R, which having strip rust resistance Yr's gene(s); Yr2, Yr7, Yr8 and Yr18+, respectively. Yellow rust reaction of the two cultivars and monogenic lines and their F1 and F2 populations were scored under field conditions. Artificial inoculation was done using mixture of physiological races of [Pst] at adult stage. Dominance of yellow rust resistance over susceptibility was noticed in most cases (in four out of five resistant by susceptible crosses). Segregation in the F2's population showed the presence of two to three gene pairs controlling plant reaction against the [Pst]. The Yr8 gene had high effectiveness of conferring resistance against [Pst] under this investigation. Meanwhile, broad sense heritability estimates was high, thus early generation selection for stripe rust resistance could be effective for wheat improving for this character.

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Section: Discussionsupporting

confidence: 93%

Inheritance of Adult Plant Stripe Rust Resistance in Wheat Cultivars Giza160 and Giza168

Shahin

Ragab

2015

Journal of Plant Protection and Pathology

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“…Individuals sublines descended from ‘R1’ (designated 4-3-3, 2-4-5 and 4-12-3; Fig. 1 ) were crossed with ‘Morocco’ wheat which was chosen for its susceptibility to leaf rust [24] , specifically the MKPS and TDBG races [25] . The F 1 plants from these crosses were infected at the seedling stage with the 06-1-1 isolate of race TDBG.…”

Section: Methodsmentioning

confidence: 99%

Heritable, De Novo Resistance to Leaf Rust and Other Novel Traits in Selfed Descendants of Wheat Responding to Inoculation with Wheat Streak Mosaic Virus

et al. 2014

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Stable resistance to infection with Wheat streak mosaic virus (WSMV) can be evolved de novo in selfing bread wheat lines subjected to cycles of WSMV inoculation and selection of best-performing plants or tillers. To learn whether this phenomenon might be applied to evolve resistance de novo to pathogens unrelated to WSMV, we examined the responses to leaf rust of succeeding generations of the rust- and WSMV-susceptible cultivar ‘Lakin’ following WSMV inoculation and derived rust-resistant sublines. After three cycles of the iterative protocol five plants, in contrast to all others, expressed resistance to leaf and stripe rust. A subset of descendant sublines of one of these, ‘R1’, heritably and uniformly expressed the new trait of resistance to leaf rust. Such sublines, into which no genes from a known source of resistance had been introgressed, conferred resistance to progeny of crosses with susceptible parents. The F1 populations produced from crosses between, respectively, susceptible and resistant ‘Lakin’ sublines 4-3-3 and 4-12-3 were not all uniform in their response to seedling inoculation with race TDBG. In seedling tests against TDBG and MKPS races the F2s from F1 populations that were uniformly resistant had 3∶1 ratios of resistant to susceptible individuals but the F2s from susceptible F1 progenitors were uniformly susceptible. True-breeding lines derived from resistant individuals in F2 populations were resistant to natural stripe and leaf rust inoculum in the field, while the ‘Lakin’ progenitor was susceptible. The next generation of six of the ‘Lakin’-derived lines exhibited moderate to strong de novo resistance to stem rust races TPMK, QFCS and RKQQ in seedling tests while the ‘Lakin’ progenitor was susceptible. These apparently epigenetic effects in response to virus infection may help researchers fashion a new tool that expands the range of genetic resources already available in adapted germplasm.

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“…It is generally assumed that, host resistance was dominant over susceptibility in most interactions (Kolmer and Dyck, 1994;Shehab El-Din et al, 1996;El-Sayed, 2001 andAwaad et al, 2003). Whereas, the reverse was true in others (Hongtas and Knott, 1990;Ali et al, 1994;Ageez andBoulot, 1999 andBarcellos et al, 2000). Moreover, adult-plant resistance to leaf rust found to be controlled by both additive and non-additive gene effects, but the additive model was more pronounced and had an important role in the inheritance of some crosses (Ageez and Boulot, 1999;Singh et al, 2000;Awaad et al, 2003;Navabi et al, 2003 andNavabi et al, 2005).…”

Section: Introductionmentioning

confidence: 95%

Inheritance of Adult Plant Resistance to Leaf Rust in Five Egyptian Bread Wheat Cultivars

Boulot¹,

Gadalla

2007

Journal of Plant Production

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The inheritance of wheat resistance to leaf rust caused by Puccinia triticina (Rob. Ex. Desm) was studied under field conditions at El-Nubaria Agric. Res. Station during 2003/04, 2004/05 and 2005/06 growing seasons. Ten crosses were made among the five Egyptian bread wheat cultivars, i.e. Sakha 94, Gemmeiza 9 and Giza 168 (resistant), Gemmeiza 7 (moderately resistant) and Giza 139 (highly susceptible) to determine quantitatively the inheritance mode and gene action of leaf rust resistance. The F1's and F2's of the ten crosses and their respective parents were evaluated for adult-plant response to leaf rust infection under field conditions at El-Nubaria during 2005/06 growing season, using three components of resistance, i.e. FRS (%), r-value and AUDPC.Analysis of variance (ANOVA) for combining ability effects showed highly significant variance due to general combining ability (GCA) and specific combining ability (SCA) effects for the three leaf rust resistance components, revealing the importance of additive as well as non-additive type of genetic variance in controlling the inheritance of these traits. Nevertheless, the higher values for the GCA variance than those of SCA variance indicated the predominance of an additive component over the dominant one for the three leaf rust resistance parameters; FRS (%), r-value and AUDPC. This result is in conformity with that, the additive component (D) of genetic variance was greater in its magnitude than their corresponding dominance values (H1) and (H2), suggesting the importance of additive gene action in the inheritance of wheat leaf rust resistance components of the study and confirmed the above result.The average of dominance (H1/D) ½ was less than unity for each component of resistance, which indicated that presence of partial dominance in the expression of wheat resistance to leaf rust. However, due to the positive values of (F), it could be suggested that the resistant cultivars in the half-diallel crosses seem to carry more dominant alleles than recessive ones for leaf rust resistance. In addition, there are at least two functioning groups of gene pairs controlling the two epidemiological parameters AUDPC and r-value in both F1 and F2. Meanwhile, final rust severity (FRS%) was governed by three gene pairs in F1 and F2. High heritability values in each broad and narrow sense were estimated for the three adult-plant resistance components. Thus, selecting resistant genotypes may be useful in the early generations, but it would be more effective if delayed to the later ones.

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Inheritance of Leaf Rust Resistance in Wheat Cultivars Morocco and Little Club

Cited by 6 publications

References 0 publications

Inheritance of Adult Plant Stripe Rust Resistance in Wheat Cultivars Giza160 and Giza168

Inheritance of Adult Plant Stripe Rust Resistance in Wheat Cultivars Giza160 and Giza168

Heritable, De Novo Resistance to Leaf Rust and Other Novel Traits in Selfed Descendants of Wheat Responding to Inoculation with Wheat Streak Mosaic Virus

Inheritance of Adult Plant Resistance to Leaf Rust in Five Egyptian Bread Wheat Cultivars

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