Fungal and bacterial foliar diseases of pea, lentil, faba bean and chickpea

Nene, Y. L.; Hanounik, S. B.; Qureshi, S. H.; Sen, Bineeta

doi:10.1007/978-94-009-2764-3_48

Cited by 26 publications

(9 citation statements)

References 11 publications

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“…Although epiphytotics of Ascochyta species infecting legumes only occur under cool moist conditions (Nene et al ., 1111), the correlation between disease reaction and the average seasonal rainfall in the collection location was non-significant (r = 0.101) . But, within Syria and southeastern Turkey, resistance was concentrated within L .…”

Section: Resultsmentioning

confidence: 99%

Response of wild lentil to Ascochyta fabae f.sp. lentis from Syria

Bayaa

Erskine

Hamdi

1994

Genet Resour Crop Evol

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Ascochyta blight induced by Ascochyta fabae f.sp . lentis is a major foliar disease affecting lentil . Screening 241 accessions of the ICARDA wild lentil germplasm collection for resistance to a Syrian isolate of this fungus was conducted under artificial inoculation in a plastic house . The reaction of resistant accessions was confirmed in a second trial . Twenty-four out of 16 accessions of Lens culinaris ssp . orientalis were resistant, as were 12 of 35 accessions of L . culinaris ssp . odemensis, 3 of 35 accessions of L . nigricans ssp . nigricans, 36 of 11 accessions of L . nigricans ssp . ervoides, and all 3 accessions of Vicia montbretii. Sixty-four per cent of resistant sources were from Syria and southeastern Turkey . Disease reaction was uncorrelated both to the altitude of collection and its annual average rainfall . A significant correlation (r = 0 .21 1) between leaflet width and disease reaction was due more to the frequency of the resistant reaction within the narrow-leaved L . nigricans ssp . ervoides than as a function of small leaf area. Disease reaction was uncorrelated with a range of other morphological traits .

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Section: Resultsmentioning

confidence: 99%

Response of wild lentil to Ascochyta fabae f.sp. lentis from Syria

Bayaa

Erskine

Hamdi

1994

Genet Resour Crop Evol

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“…Ascochyta fabae, A. pisi, A. lentis, A. rabiei, and A. viciae-villosae are pathogens of faba bean (V. faba), pea (P. sativum), lentil (L. culinaris), chickpea (C. arietinum) and hairy vetch (Vicia villosa), respectively (Nene and Reddy 1987;Nene et al 1988;Kaiser 1997a, b;Mel'nik et al 2000). Several Ascochyta anamorphs have been connected to Didymella teleomorphs (Jellis and Punithalingam 1991;Kaiser et al 1997).…”

Section: Species Of Ascochytamentioning

confidence: 97%

Role of host specificity in the speciation of Ascochyta pathogens of cool season food legumes

Peever

2007

Eur J Plant Pathol

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Ascochyta/legume interactions are attractive systems for addressing evolutionary questions about the role of host specificity in fungal speciation because many wild and cultivated cool season food legumes are infected by Ascochyta spp. and most of these fungi have described teleomorphs (Didymella spp.) that can be induced in the laboratory. Recent multilocus phylogenetic analyses of a worldwide sample of Ascochyta fungi causing ascochyta blights of chickpea (Cicer arietinum), faba bean (Vicia faba), lentil (Lens culinaris), and pea (Pisum sativum) have revealed that fungi causing disease on each host formed a monophyletic group. Host inoculations of these fungi demonstrated that they were host-specific, causing disease only on the host species from which they were isolated. In contrast to the strict association between monophyletic group and host observed for pathogens of cultivated legumes, Ascochyta fungi causing disease on wild bigflower vetch (Vicia grandiflora) were polyphyletic. Genetic crosses between several pairs of closely related, host-specific, and phylogenetically distinct Ascochyta fungi were fully sexually compatible. Progeny from these crosses had normal cultural morphology and segregation of molecular markers indicating a lack of intrinsic, post-zygotic mating barriers between the parental taxa. However, when progeny from a cross between a faba bean-adapted isolate (A. fabae) and a pea-adapted isolate (A. pisi) were assessed for their pathogenicity to the parental hosts, almost all progeny were non-pathogenic to either faba bean or pea. These results suggest that although these fungi have retained the ability to mate and produce progeny with normal saprophytic fitness, progeny are severely compromised in parasitic fitness. The host specificity of these fungi, coupled with the inability of hybrid progeny to colonize and reproduce on a host, may constitute strong extrinsic, pre-zygotic and postzygotic mating barriers in these fungi and promote the genetic isolation and speciation of host-specific taxa. A phylogeny of the host plants is also being developed, and with more extensive sampling of pathogens and hosts from sympatric populations in the centre of origin, the hypothesis of cospeciation of pathogens and hosts will be tested. The objectives of this review are: (1) to summarize recent phylogenetic, host specificity and speciation studies of Ascochyta fungi, and (2) to suggest how current and future research using these pathosystems may lead to a better understanding of the role of host specificity in the speciation of plant-pathogenic fungi and the cospeciation of pathogens and their hosts.

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“…f. sp. lentis Gossen et al Ascochyta blight is distributed with varying levels of importance throughout lentil growing countries (Nene et al 1988). In the USA and Canada yield losses as high as 40% and 70%, respectively, have been reported (Gossen & Morrall 1983, Kaiser 1992).…”

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confidence: 99%