Vegetos

Abstract

Knowledge of inheritance pattern is prerequisite for breeding of any disease resistance. In the present experiment the inheritance pattern for Cercospora Leaf Spot (CLS) resistance in Mung bean was studied. Ten genotypes of mungbean were crossed with five genotypes of urd bean to obtain 50 crosses out of which only 15 crosses could be harvested successfully. Six CLS susceptible varieties were crossed with three CLS resistant genotypes of mungbean i.e. HUM-1, ML-1194 and ML-1229 to obtain 18 crosses, however 12 were successful. Out of these, 12 each of F₁s, F₂s and F₃s of intra-specific crosses along with their parents and three each of F₁s, F₂s and F₃s of inter-specific crosses along with their parents were grown in the field in compact family block design with three replications during kharif 2009. Highly susceptible variety HUM-8 was used as infector row for CLS after every two rows of the test entries. The F1 generation of all the intra and inter-spesific crosses showed resistant reaction to CLS. This indicates that resistance was dominant over susceptibility. The segregation ratios in F₂ population of all the crosses except HUM-1 × Shekhar-2, was observed to be 3 (Resistant): 1 (Susceptible) and the segregation pattern within the F₃ segregating population was also in agreement with the results of F₂ observation further confirming the control of single dominant gene for inheritance of resistance to CLS.