Genetics of resistance to Mycosphaerella pinodes in Lathyrus sativus
B. Skiba A C , R. Ford B and E. C. K. Pang AA Department of Biotechnology and Environmental Biology, RMIT University, Plenty Road, Bundoora, Vic. 3083, Australia.
B BioMarka, Institute of Land and Food Resources, The University of Melbourne, Parkville, Vic. 3010, Australia.
C Corresponding author; email: beata.skiba@rmit.edu.au
Australian Journal of Agricultural Research 55(9) 953-960 https://doi.org/10.1071/AR04066
Submitted: 16 March 2004 Accepted: 23 July 2004 Published: 24 September 2004
Abstract
Three Lathyrus sativus accessions were screened for their reaction to Mycosphaerella pinodes infection. Accession ATC 80878 displayed the lowest percentage stem lesion values (%SL) and was significantly more resistant to M. pinodes than ATC 80407 and ATC 80053. Accession ATC 80407 was the most susceptible, displaying the severest disease symptoms. A backcross and an F2 population were generated using accessions ATC 80878 and ATC 80407 as the resistant and susceptible parents, respectively. The backcross and F2 progeny segregated in a 3 : 1 and 7 : 9 ratio, respectively, for resistance/susceptibility, using the 99% confidence intervals for the means of the parental controls in each assay to determine the point of discontinuity. The segregation data from both populations fitted a Mendelian segregation model that suggested that resistance in the L. sativus accession ATC 80878 may be controlled by 2 independently segregating genes, operating in a complementary epistatic manner.
Additional keywords: ascochyta blight, field pea, grasspea, pulses.
Acknowledgments
We thank A. M. Gurung for providing the L. sativus and Pennant seeds, J. B. Brouwer for his advice and support, and the ARC (APAI) and DPI for providing the scholarship and funding for this project.
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