Evaluation of a wild lentil collection for resistance to vascular wilt

Abstract

Vascular wilt caused by Fusarium oxysporum f. sp. lentis Vasud. & Srin. is the major disease of the cultivated lentil (Lens culinaris Medikus). Host plant resistance is the most practical method of disease management. Wild lentils .represent an unexplored potential source for disease resistance and other characters. Screening 219 accessions of wild Lens Miller and 2 accessions of Vicia montbretii Fisch. & Mey. (syn. Lens montbretii (Fisch et Mey) Davis et Plitm.) for resistance to a Syrian isolate of this fungus at the seedling stage was conducted under artificial inoculation in a plastic house. Resistance at the reproductive growth stage was confirmed in pots in a plastic house and in a wilt-sick plot. Three accessions each of Lens culinaris ssp. orientatis (Boiss.) Ponert and L. nigricans M.B. Godr. ssp. nigricans Godr. and 2 ofL. nigricans ssp. ervoides (Brign.) Lad. maintained their resistance at the reproductive growth stage in the plastic house. All accessions of L. culinaris ssp. odemensis Lad. and V. montbretii were susceptible. However, in the sick-plot only three accessions (ILWL 79 & ILWL 113 of L. culinaris ssp. orientalis and ILWL 138 ofL. nigricans ssp. ervoides) maintained a good level of resistance. Resistance at the seedling stage was often found in accessions collected from northern and western sites of the distribution of the genus at low elevations. The most resistant accessions in the field at the reproductive growth stage were from Syria and Turkey.

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.…”

Screening of Lentil (Lens culinaris Medikus sub sp. culinaris) Germplasm against Fusarium Wilt (Fusarium oxysporum f. sp. lentis)

“…The method for screening in wilt sick plot has been described by , Bayaa et al, (1995Bayaa et al, ( , 1997, and Eujayl et al, (1998). The experimental material for the present study comprised of 93 lentil genotypes.…”

“…Application of fungicide is one of the solutions to overcome this problem but field applications is not feasible due to the expense required and technical difficulty in infusing chemicals into the soil (Taylor et al, 2007). The most sustainable and effective solution to this problem is the development of resistant cultivars (Bayaa et al, 1995;Kraft et al, 2000).…”

Soilborne Diseases and their Control

“…& C.A. can be infected when artificially inoculated (Bayaa et al, 1995). Although variability in fungal sensitivity to nutrition, fungicides, and temperature exists in strains of F. oxysporum f. sp.…”

“…Sources of resistance have been found by many authors in cultivated lentil (Kannaiyan & Nene, 1976;Bayaa & Erskine, 1990;Hamdi et aI., 1991;Hossain et al, 1985;Khare et ai., 1979;Tiwari & Singh, 1980) (Bayaa et al, 1995).…”