Genetic Control of Interspecific-Derived and Juvenile Resistance in Lentil to Colletotrichum truncatum
- S. Vail * and
- A. Vandenberg
Anthracnose, caused by Colletotrichum truncatum (Ct), is a major disease of lentil (Lens culinaris ssp. culinaris Medik.; Lcc) on the Canadian prairies. Resistance to the more virulent race Ct0 of the pathogen is extremely rare within the Lcc gene pool; partial resistance to race Ct0 in Lcc breaks down as the plant progresses through the adult phase (AP). Resistance was introgressed from Lens ervoides (Le) and the F1 and F2 generations of two introgression populations assessed for resistance when inoculated separately with both races of Ct. One population was tested with race Ct0 at both the juvenile phase (JP) and AP. F2:3 families were also tested for race Ct0 resistance. Resistance from Le to both races of Ct appears to be due to the same gene(s) or tightly linked genes. Different models for genetic control of resistance between populations are observed depending on whether the interspecific line is crossed into a susceptible or partially resistant Lcc background; however, duplicate recessive epistasis seems to control susceptibility in the susceptible background and when juvenile resistance is not a factor. Significant differences between phases were evident for more than a third of the F2s tested, supporting different resistance gene action based on growth phase; resistance in the JP seemed to be due to dominant and recessive epistasis. Results suggest genetic control of juvenile resistance in combination with interspecific-derived resistance is complex.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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