A Comparisom on the Efficency of Three Selection Methods in Mungbean

Abstract

A study was undertaken to compare the efficiency of three breeding methods generally employed in self-pollinated crops. The methods were Early Generation Tsting (EGT), Pedigree (PDG) and Single Seed Descent (SSD). Thirty F3 mungbean crosses were selected from 79 F2 crosses based on lodging resistance and resistance to Cercospora leaf spot and powdery mildew diseases. Selection in the F4 and F5 generation was according to the basic procedures for each method, resulting in 102 selected F6 lines from each method. The 306 selected lines were yield-tested and 20 lines from each method chosen based on higher yield and large seed size. Yield-test were performed again in the F7 and F8 generations.
The results revealed that in relation to yield and lodging resistance, more superior lines were derived from the SSD than the EGT and PDG methods. The EGT method, on the other hand, gave a better response to selection for seed size. The SSD method also requires less area, time and labour when compared with the EGT and PDG method. It is concluded that the best selection method for mungbean under environments similar to Thailand is the SSD method.