Mating type distribution and incidence of the teleomorph of<i>Ascochyta rabiei</i>(<i>Didymella rabiei</i>) in Canada

Armstrong, Charles; Chongo, G.; Gossen, B. D.; Duczek, L. J.

doi:10.1080/07060660109506917

Cited by 61 publications

(45 citation statements)

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“…Sexual reproduction is controlled by a single regulatory locus referred to as a mating-type locus and alternate sequences at the mating-type locus are completely dissimilar and code for different regulatory genes. The presence of opposite mating types (MAT1-1 and MAT1-2) and the teleomorph have been reported from some chickpea-growing regions in the world [24][25][26][27][28][29]. The morphological characteristics of A. rabiei and Phoma medicaginis var.…”

Section: Characteristics Of Ab In Chickpeamentioning

confidence: 99%

An Update on Genetic Resistance of Chickpea to Ascochyta Blight

Sharma

Ghosh

2016

Agronomy

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Ascochyta blight (AB) caused by Ascochyta rabiei (Pass.) Labr. is an important and widespread disease of chickpea (Cicer arietinum L.) worldwide. The disease is particularly severe under cool and humid weather conditions. Breeding for host resistance is an efficient means to combat this disease. In this paper, attempts have been made to summarize the progress made in identifying resistance sources, genetics and breeding for resistance, and genetic variation among the pathogen population. The search for resistance to AB in chickpea germplasm, breeding lines and land races using various screening methods has been updated. Importance of the genotypeˆenvironment (GE) interaction in elucidating the aggressiveness among isolates from different locations and the identification of pathotypes and stable sources of resistance have also been discussed. Current and modern breeding programs for AB resistance based on crossing resistant/multiple resistant and high-yielding cultivars, stability of the breeding lines through multi-location testing and molecular marker-assisted selection method have been discussed. Gene pyramiding and the use of resistant genes present in wild relatives can be useful methods in the future. Identification of additional sources of resistance genes, good characterization of the host-pathogen system, and identification of molecular markers linked to resistance genes are suggested as the key areas for future study.

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Section: Characteristics Of Ab In Chickpeamentioning

confidence: 99%

An Update on Genetic Resistance of Chickpea to Ascochyta Blight

Sharma

Ghosh

2016

Agronomy

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“…The disease reaction of current chickpea cultivars in western Canada ranges from partially resistant to highly susceptible, and no cultivar is totally resistant (Chongo et al 2004). Airborne ascospores play an important role in the dispersal of the pathogen and make disease control difficult (Armstrong et al 2001). Chongo and Gossen (2001) reported that expression of partial resistance declines at the flowering stage.…”

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confidence: 99%

Improved sources of resistance to ascochyta blight in chickpea

Chandirasekaran¹,

Warkentin²,

Gan³

et al. 2009

Can. J. Plant Sci.

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Tar'an, B. and Banniza, S. 2009. Improved sources of resistance to ascochyta blight in chickpea. Can. J. Plant Sci. 89: 107Á118. Successful chickpea production in western Canada typically requires multiple applications of fungicides to minimize the severity of ascochyta blight (AB) caused by Ascochyta rabiei (Pass.) Lab. Although planting resistant cultivars could be economical and environmentally safer than fungicide use, varieties with a high level of resistance are not available. The objective of this research was to identify potentially useful parents for breeding programs aimed at the northern Great Plains by assessing the AB reaction of 12 desi and 12 kabuli chickpea varieties for their AB reaction on leaves, stems and pods under two fungicide regimes. The experiment was conducted at Swift Current and Shaunavon, Saskatchewan, in 2004 and. Differences in AB severity on leaves, stems and pods, seed yield and 1000-seed weight occurred among varieties at all site-years tested. The variation was greater among kabuli varieties than desi varieties. Ascochyta blight severity was generally lower under the high fungicide regime. A positive correlation in AB severity on leaves, stems and pods was observed, suggesting a lack of organ-specific reaction. Several promising varieties that combined improved levels of AB resistance, high yield, and large seed size were identified. Toutes les varie´te´s ont re´agi diffe´remment al 'ascochytose, la gravite´des symptoˆmes variant au niveau des feuilles, des tiges, des gousses, du rendement grainier et du poids de 1 000 graines a`toutes les anne´es-sites. La re´action des cultivars kabuli variait plus que celle des cultivars desi. En ge´ne´ral, l'ascochytose cause moins de dommages quand on applique plus de fongicide. Il existe une corre´lation positive entre la gravite´de l'ascochytose sur les feuilles, les tiges et les gousses, ce qui laisse croire que la maladie n'affecte pas spe´cifiquement certains organes. Plusieurs varie´te´s prometteuses combinant une meilleure re´sistance a`la maladie, un rendement e´leve´et des graines de gros calibre ont pu eˆtre identifie´es.

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“…The ex tent of ge netic dif fer en ti a tion among subpopula tions ob served in this study was sim i lar to other plant patho gens such as Cryphonectria parasitica subpopulations (Cortesi et al 1996), A.rabiei pop u la tions (Armstrong et al 2001, A.lentis pop u la tions (Banniza and Vandenberg 2006) and Aphanomyces euteiches pop u la tions (Malvick and Percich 1998). Ob tained re sults are not sim i lar to some ascomycete plant patho gens with sim i lar bi ol ogy to heterothallic spe cies P.pinodella (teleomorph Didymella).…”

Section: Discussionmentioning

confidence: 87%

“…Sim i larly still is im pos si ble to make the conven tional ge netic sex ual cross ing and ob tain pseudothecia re gard ing the heterothallic spe cies of Ascochyta (Didymella) pisi and Phoma (Didymella) pinodella due to lack of mat ing type test ers and sen si tive mo lec u lar markers. More de tailed anal y ses on pop u la tion ge net ics of A.pisi, A.pinodes and P.pinodella have be gun since 1997 when mo lec u lar mark ers for the first time were used (Bouznad et al 1995, Faris-Mokaiesh et al 1996, Fatehi and Bridge 1998, Fatehi 2000, Fatehi et al 2003, Onfroy et al 1999, Tohamy and Mohamed 1998, Lubeck et al 1998, Armstrong et al 2001, Peever et al 2002, Fondevilla et al 2006, Zhang et al 2003.…”

Section: Introductionmentioning

confidence: 99%

Genotypic population structure of Ascochyta pinodes and Phoma pinodella in Poland

Furgał-Węgrzycka¹,

Węgrzycki²

2009

Plant Breeding and Seed Science

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The genotypic pop u la tions struc ture of Ascochyta pinodes and Phoma pinodella was de ter mined across a hi er ar chy of spa tial and tem po ral scale by us ing veg e ta tive in com pat i bil ity sys tem as phenotypic ge netic marker. Com po nents of ge netic vari a tion within and be tween pop u la tions in cluded the fol low ing val ues: in dices of di ver sity H', rich ness (g), in di ces of even ness E 1 , E 2 and E 5, spatio-tem po ral anal y sis of genotypic varia tion (H T and H S val ues), pairwise com par i sons of ge no type di ver sity, dis tri bu tion of VCGs across spatio-tem po ral scale (G ST value) and anal y sis of vari ance cal cu lated on VCGs ge no type fre quen cies within pop u la tions. It has been found that genotypic pop u la tions struc ture of Ascochyta pinodes and Phoma pinodella be long to mixed pop u la tion struc ture clonal and re com bin ing. Three re gional pop u la tions of Ascochyta pinodes and Phoma pinodella dif fered sig nif i cantly in both of VCGs ge no type fre quen cies and their dis tri bu tion on a spatio-tem po ral scale in di cat ing on the low or mod er ate de gree of ge no type mi gra tion be tween re gions of Po land.Keywords: Mycosphaerella (Didymella) pinodes anamorph Ascochyta pinodes, Phoma pinodella (teleomorph Didymella), genotypic pop u la tion struc ture, com po nents the ge netic vari a tion of pop u la tion, VCG fre quency, spa tial and tem po ral VCG diversity INTRODUCTIONAscochyta blight of pea is caused pri mar ily by Ascochyta pinodes (Berk et Blox) Jones teleomorph Mycosphaerella pinodes (Berk et Blox) Vesterg = Didymella pinodes, Pertrak and Phoma medicaginis var pinodella (Jones) Boerema = A.pinodella Jones (teleomorph Didymella). This dis ease provides a good ex am ple of the dif fi cul ties in seed in fec tions con trol ling and ep i dem ics of Ascochyta blight causes by patho gens that are highly host-spe cific and are ca pa ble of caus ing se ri ous dam age in a con duc tive envi ron ment. Since the area of pea has sys tem at i cally in creased in some countries of the world, Ascochyta blight of pea has be come one of the most im por tant dis eases in pea pro duc tion. Ex cept of di rect yield losses, Communicated by Ed ward ArseniukPLANT BREEDING AND SEED SCIENCE

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Mating type distribution and incidence of the teleomorph ofAscochyta rabiei(Didymella rabiei) in Canada

Cited by 61 publications

References 11 publications

An Update on Genetic Resistance of Chickpea to Ascochyta Blight

An Update on Genetic Resistance of Chickpea to Ascochyta Blight

Improved sources of resistance to ascochyta blight in chickpea

Genotypic population structure of Ascochyta pinodes and Phoma pinodella in Poland

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