Vol. 10, Issue 8 (2021)

Author(s):
N Sabitha, D Mohan Reddy, M Hemanth Kumar, D Lokanadha Reddy and B Ravindra Reddy

Abstract:
Identification of favourable alleles in the inbred lines (µG') not present in either of the parents given by Dudley is considered one of the most efficient method to enhance the productivity of superior single cross hybrids. The present investigation was conducted to identify favourable alleles (µG') among eight inbred lines for improvement of an elite single cross Heypool × PDM 1474, which recorded the highest yield performance among the 45 hybrids that were generated through 10×10 half diallel mating design and evaluated over three different seasons viz., rabi, summer and kharif. The results indicated that most of the donors showed significant positive µG’' estimates for more than two characters studied in all seasons and pooled over seasons indicating the presence of favourable alleles. The donor inbred lines viz., DFTY and BML 2 were identified as the best donor inbred lines based on µG' estimates for yield and yield components for improvement of yield in the selected superior single cross hybrid Heypool × PDM 1474. The µG' estimates for the same donor inbred lines greatly varied for the same character across seasons for the selected superior hybrid which could be attributable to the differential effect of environmental factors on the same set of genes governing expression of the same character in different seasons. Considering the genetic similarities and other parameters (µB' to µG') of the model suitable breeding strategy was suggested either to bring improvement in the performance of the superior hybrid Heypool × PDM 1474 or to develop new hybrid using the best donor lines by improving any one of the parental lines of the selected hybrid.