Prediction of F3 populations based on unbalanced diallel crossing systems

Abstract

The objective of this paper was to predict the properties of F₃ generation of the dry bean based on F₁ generation data from diallel crosses. Eight hybrid combinations from compatible crosses between seven parents (Diacol Andino, Ica Lhanogrande, Ica Tundama, Rojo 70, Rio Tibagi, Carioca, and Roxo) were analyzed by comparing the unbalance circulating and partial diallel crossing systems. The F₁ hybrid combinations and the parents were arranged in a complete randomized design with varying number of replications per treatment under greenhouse conditions. The F₃ generation was grown in two areas under field conditions in a complete randomized block design. The following traits, number of pods per plant and seed weight per plant, were evaluated. Prediction based upon general capacity of combination (CGC) in F₁ generation was more efficient than performance in F₁ generation to predict F₃ segregant hybrid combinations. Negative correlation between the generations observed and the predicted generations was noted when the unbalanced circulating diallel crossing systems were used.