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

Abstract

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 .

Legume Crops Phylogeny and Genetic Diversity for Science and Breeding

“…The wild Lens taxa are known to possess resistance to biotic and abiotic stresses (Bayaa et al, 1994(Bayaa et al, , 1995Gupta and Sharma, 2006). Incorporation of diverse genetic material from wild relatives using intensive hybridization would make it possible to recreate some of the lost variability while still respecting productivity and other desirable traits in lentil.…”

The Chickpea, Summer Cropping, and a New Model for Pulse Domestication in the Ancient Near East

“…Whereas severe Ascochyta blight infection in chickpea is devastating, effects of the disease in lentil and pea are less conspicuous. Although substantial yield losses may occur in pea and lentil, complete destruction of the plants is uncommon even under severe epidemics (Gossen and Morrall 1983;Bayaa et al 1992;Ali et al 1994;Tivoli et al 1996;Morrall 1997). Thus, lentil and pea could have been sown in the winter, survived Ascochyta blight epidemics, and produced at least some yield.…”

Lentil

“…Resistance to Ascochyta blight, screening techniques, and breeding methods have been reported (Bayaa et al 1994 ;Ye et al 2002 ;Muehlbauer and Chen 2007 ;Tivoli et al 2006 ). The genetic control of Ascochyta blight resistance was described to be monogenic recessive in spite of having observed transgressive segregations (Tay and Slinkard 1989 ).…”

“…However, no commercial tetraploid lentil varieties have so far been released. (Bayaa et al 1994 ). Ye et al ( 2002 ) listed a series of cultivated and wild lentil materials as sources of partial resistance to Ascochyta blight, and Muehlbauer and Chen ( 2007 ) reported that the most prominent among the partially resistant germplasm accessions consisted of lentil accessions PI 339283, PI 374118, ILL5588, ILL5684, PR86-360, and ILL7537.…”