Resistance to Ascochyta blight in chickpea - Genetic basis

Dey, S. K.; Singh, Gurdip

doi:10.1007/bf00024163

Cited by 42 publications

(37 citation statements)

References 7 publications

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“…The dominant resistance conferred by the minor QTLs in the two-QTL models, supported this possible resistance mechanism. By classical genetic analysis of disease segregation, epistatic interactions between two (Dey and Singh 1993) or three ABR genes were also suggested in inter-and intraspecific populations of chickpea. In rice, a similar conclusion was drawn for yield and yield-component traits whereby, a strong additive gene epistasis was found to be important in controlling the expression of the traits (Li et al 1997;Xing et al 2002).…”

Section: Discussionmentioning

confidence: 98%

QTL analysis for ascochyta blight resistance in an intraspecific population of chickpea (Cicer arietinum L.)

et al. 2003

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In both controlled environment and the field, six QTLs for ascochyta blight resistance were identified in three regions of the genome of an intraspecific population of chickpea using the IDS and AUDPC disease scoring systems. One QTL-region was detected from both environments, whereas the other two regions were detected from each environment. All the QTL-regions were significantly associated with ascochyta blight resistance using either of the disease scoring systems. The QTLs were verified by multiple interval mapping, and a two-QTL genetic model with considerable epistasis was established for both environments. The major QTLs generally showed additive gene action, as well as dominance inter-locus interaction in the multiple genetic model. All the QTLs were mapped near a RGA marker. The major QTLs were located on LG III, which was mapped with five different types of RGA markers. A CLRR-RGA marker and a STMS marker flanked QTL 6 for controlled environment resistance at 0.06 and 0.04 cM, respectively. Other STMS markers flanked QTL 1 for field resistance at a 5.6 cM interval. After validation, these flanking markers may be used in marker-assisted selection to breed for elite chickpea cultivars with durable resistance to ascochyta blight. The tight linkage of RGA markers to the major QTL on LG III will allow map-based cloning of the underlying resistance genes.

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Section: Discussionmentioning

confidence: 98%

QTL analysis for ascochyta blight resistance in an intraspecific population of chickpea (Cicer arietinum L.)

et al. 2003

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“…Various mechanisms explaining blight resistance in chickpea have been proposed (Ahmad et al 1952;Dey and Singh 1993;Tekeoglu et al 2002). Although the quantitative nature of blight resistance in chickpea was revealed (Kusmenoglu et al 1990;Tekeoglu et al 2000;FlandezGalvez et al 2003), genetic roles of the genes in pathotype-dependent blight resistance and dominance or recessiveness of the genes could not be clarified because of dramatic changes in resistance patterns of the population depending on the pathogenic and the environmental conditions.…”

Section: Quantitative Genetics Of Ascochyta Blight Resistance In Chicmentioning

confidence: 96%

Pathotype-specific genetic factors in chickpea (Cicer arietinum L.) for quantitative resistance to ascochyta blight

2004

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Ascochyta blight in chickpea (Cicer arietinum L.) is a devastating fungal disease caused by the necrotrophic pathogen, Ascochyta rabiei (Pass.) Lab. To elucidate the genetic mechanism of pathotype-dependent blight resistance in chickpea, F 7 -derived recombinant inbred lines (RILs) from the intraspecific cross of PI 359075(1) (blight susceptible) × FLIP84-92C(2) (blight resistant) were inoculated with pathotypes I and II of A. rabiei. The pattern of blight resistance in the RIL population varied depending on the pathotype of A. rabiei. Using the same RIL population, an intraspecific genetic linkage map comprising 53 sequence-tagged microsatellite site markers was constructed. A quantitative trait locus (QTL) for resistance to pathotype II of A. rabiei and two QTLs for resistance to pathotype I were identified on linkage group (LG)4A and LG2+6, respectively. A putative single gene designated as Ar19 (or Ar21d) could explain the majority of quantitative resistance to pathotype I. Ar19 (or Ar21d) appeared to be required for resistance to both pathotypes of A. rabiei, and the additional QTL on LG4A conferred resistance to pathotype II of A. rabiei. Further molecular genetic approach is needed to identify individual qualitative blight resistance genes and their interaction for pathotype-dependent blight resistance in chickpea.

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“…To date, the pathogen has been classified mainly into two broad pathotypes: pathotype I (less aggressive) and pathotype II (aggressive) ; but further research is required to identify the genes that control aggressiveness. As for the host, early studies on the inheritance of blight resistance indicated that it could be conferred by one, two or three genes (Singh and Reddy 1983;Tewari and Pandey 1986;Dey and Singh 1993;Tekeoglu et al 2000). Furthermore, evidence that resistance might be inherited as a quantitative trait has been reported (Muehlbauer and Kaiser, 1994).…”

Section: ó Knpv 2007mentioning

confidence: 97%

Validation of a QTL for resistance to ascochyta blight linked to resistance to fusarium wilt race 5 in chickpea (Cicer arietinum L.)

et al. 2007

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Ascochyta blight caused by Ascochyta rabiei and fusarium wilt caused by Fusarium oxysporum. f. sp. ciceris are the two most serious diseases of chickpea (Cicer arietinum). Quantitative trait loci (QTL) or genes for ascochyta blight resistance and a cluster of resistance genes for several fusarium wilt races (foc1, foc3, foc4 and foc5) located on LG2 of the chickpea map have been reported independently. In order to validate these results and study the linkage relationship between the loci that confer resistance to blight and wilt, an intraspecific chickpea recombinant inbred lines (RIL) population that segregates for resistance to both diseases was studied. A new LG2 was established using sequence tagged microsatellite sites (STMS) markers selected from other chickpea maps. Resistance to race 5 of F. oxysporum (foc5) was inherited as a single gene and mapped to LG2, flanked by the STMS markers TA110 (6.5 cM apart) and TA59 (8.9 cM apart). A QTL for resistance to ascochyta blight (QTL AR3 ) was also detected on LG2 using evaluation data obtained separately in two cropping seasons. This genomic region, where QTL AR3 is located, was highly saturated with STMS markers. STMS TA194 appeared tightly linked to QTL AR3 and was flanked by the STMS markers TR58 and TS82 (6.5 cM apart). The genetic distance between foc5 and QTL AR3 peak was around 24 cM including six markers within this interval. The markers linked to both loci could facilitate the pyramiding of resistance genes for both diseases through MAS.

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Resistance to Ascochyta blight in chickpea - Genetic basis

Cited by 42 publications

References 7 publications

QTL analysis for ascochyta blight resistance in an intraspecific population of chickpea (Cicer arietinum L.)

QTL analysis for ascochyta blight resistance in an intraspecific population of chickpea (Cicer arietinum L.)

Pathotype-specific genetic factors in chickpea (Cicer arietinum L.) for quantitative resistance to ascochyta blight

Validation of a QTL for resistance to ascochyta blight linked to resistance to fusarium wilt race 5 in chickpea (Cicer arietinum L.)

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