Sources of Resistance to Anthracnose (Colletotrichum truncatum) in Wild Lens Species

Abstract

Lentil anthracnose (Colletotrichum truncatum (Schwein.) Andrus et W.D. Moore is a potential threat in many lentil (Lens culinaris Medik.) production regions of North America. In the lentil germplasm maintained in Germany and North America, 16 lines were reported to have resistance to race Ct1, but none has resistance reported to race Ct0. The objective of this study was to examine accessions of wild Lens species for their resistance to races Ct1 and Ct0 of lentil anthracnose. Five hundred and seventy-four wild accessions of six species and control lines were screened in two replications under both field and greenhouse conditions using a 1-9 scoring scale (1, highly resistant; 2-3, resistant; 4-5, moderately resistant; 6-7, susceptible; and 8-9, highly susceptible). Indianhead and PI 320937 were resistant while Eston and Pardina were susceptible to race Ct1 as expected. However, none of the check lines were resistant to race Ct0. Among the six Lens wild species tested, accessions of Lens ervoides (Brign.) Grande had the highest level of resistance, 3-5 to race Ct1 and Ct0 followed by L. lamottei Czefr. in the field and greenhouse. Lens orientalis (Boiss.), L. odemensis L., L. nigricans (M. Bieb.) Godron and L. tomentosus L. were highly susceptible, 8-9 to race Ct0 in the greenhouse. The highest frequency of resistance, especially in L. ervoides (Brign.) Grande, was found in accessions originating from Syria and Turkey. The usefulness of these L. ervoides (Brign.) Grande accessions as sources of resistance to the more virulent race of anthracnose in a lentil breeding program is discussed.

Legume Crops Phylogeny and Genetic Diversity for Science and Breeding

“…lentis Vasudeva and Srinivasan), sclerotinia stem rot (Sclerotinia sclerotiorum (Lib.) de Bary) and broomrape (Orobanche crenata Forssk) with several wild lentil species and accession found to be source of resistances (Buchwaldt et al, 2004;Fernández-Aparicio et al, 2008Chen et al, 2009;Tullu et al, 2006;Vail et al, 2012;Rubiales et al, 2013;Shaikh et al, 2013).…”

Lentil

“…However, frequency of occurrence of these useful genes have been observed much more in the species belonging to secondary and tertiary gene pools (Collard et al 2001 ;Tullu et al 2006 ). Therefore, more efforts are required on deployment of novel techniques for using these gene pools for the improvement of lentils.…”

“…orientalis . Combined resistance to ascochyta blight and fusarium wilt (ILWL 138) or anthracnose diseases (IG 72653, IG 72646, IG 72651) have also been identifi ed (Bayaa et al 1995 ;Tullu et al 2006 ). Gupta and Sharma ( 2006 ) reported genetic variability for yield attributes and biotic and abiotic stresses among 70 accessions of four wild species/subspecies ( L. culinaris ssp.…”

“…In lentil, attempts have been made to transfer the alien genes from L. lamottei and L. nigricans to Lens culinaris using L. ervoides as a bridge species along with embryo rescue technique. This offers the possibility of transferring the genes for resistance to ascochyta blight and anthracnose to L. culinaris and broadening the resistance gene base in the cultivated species (Ye et al 2002 ;Tullu et al 2006 ).…”

Vigna

“…Table 8.1 elaborates the species in the secondary and tertiary gene pools on the basis of V. radiata and V. mungo put in primary gene pool. Among the wild species, occurrence of useful Source : Kumar et al ( 2011 ) genes is much more frequent in the secondary and tertiary gene pools (Mallikarjuna et al 2006 ;Tullu et al 2006 ). However, successful hybridization between the cultivated vignas and their wild relatives in secondary and tertiary gene pools is constrained by crossability barriers, and therefore, their successful utilization in crop improvement programs requires special efforts and use of novel techniques such as embryo rescue, poplyploidization, reciprocal crossing, hormonal manipulations, and use of bridge species.…”