Abstract
Anthracnose caused by the fungal pathogen Colletotrichum truncatum is a severe disease of lentil (Lens culinaris Medikus subsp. culinaris) causing premature defoliation and deep penetrating lesions on the stems leading to wilting and plant death. A total of 579 accessions from 20 countries were obtained from four germplasm collections in Russia, Poland, Bulgaria and Hungary. The accessions were collected between 1923 and 1988 and comprised mostly landraces. Consequently, many of the resistant entries contained susceptible plants which necessitated one or two cycles of selection of individual resistant plants for selfing and re-testing with the pathogen. Under controlled environmental conditions, plants of each accession were inoculated at early flower with C. truncatum race Ct0 (isolate 95A8) and race Ct1 (isolate 95B36), separately. Scoring of symptoms included number of lesions on the main stem, lesion penetration into the stem and amount of wilting. Resistance was obtained by single plant selection in 23 lentil accessions (4.0 %). Fifteen lines were generated with resistance to race Ct1 (2.6 %), seven with resistance to race Ct0 (1.2 %), and one line with resistance to both races. This is the first report on resistance in L. culinaris to C. truncatum race Ct0 as well as to the two races combined. Seed of homozygous resistant lines can be requested from the corresponding author, and are labeled with their original accession number with the prefix either -Ct0, -Ct1 or -Ct0Ct1 indicating resistance to one or both races of C. truncatum.
Highlights
Anthracnose, caused by Colletotrichum truncatum (Schwein.) Andrus et W.D
Anthracnose caused by the fungal pathogen Colletotrichum truncatum is a severe disease of lentil (Lens culinaris Medikus subsp. culinaris) causing premature defoliation and deep penetrating lesions on the stems leading to wilting and plant death
The main objective of this research was to generate lines homozygous resistant to both races of C. truncatum identified in western Canada (Buchwaldt et al 2004)
Summary
Anthracnose, caused by Colletotrichum truncatum (Schwein.) Andrus et W.D. Moore, is a damaging fungal pathogen of lentil (Lens culinaris Medikus subsp. culinaris) in North America. Anthracnose, caused by Colletotrichum truncatum (Schwein.) Andrus et W.D. Moore, is a damaging fungal pathogen of lentil A few years later it was found in both Saskatchewan (Morrall and Pedersen 1991) and North Dakota, United States (Venette et al 1994). Anthracnose of lentil has been reported from Bulgaria, Morocco, Ethiopia, Syria, Pakistan, Bangladesh and Brazil (Bellar and Kebabeh 1983; Baldanzi et al 1988; Morrall 1997; Kaiser et al 1998). Colletotrichum truncatum survives in the form of microsclerotia in infested lentil debris for up to 4 years under western Canadian conditions (Buchwaldt et al 1996). The first disease symptoms develop at early flowering when tan, necrotic lesions form on the lower leaflets leading to premature defoliation. Sunken tan colored lesions with dark margins, which are typical for anthracnose, start to develop at the stem base and spread to the upper part of the main stem and side branches throughout the growing season
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