Abstract

An experiment was conducted to develop and evaluate the biparental progenies (BIPs) for important yield component traits in three rice cross combinations, namely, JGL 384 × Rasi (Cross I), KJTCMS 5B × IR 64 (Cross II), WGL 14 × Rasi (Cross III). Genetic analysis of biparental progenies revealed that, the traits, namely, days to 50% flowering, plant height and number of productive tillers per plant in Cross I and number of productive tillers per plant in Cross II were governed by additive gene action and for the improvement of these traits pure line selection, mass selection and or progeny selection and pedigree breeding method may be followed. Preponderance of non – additive type of gene action was observed for all the traits studied in Cross III and remaining traits in Crosses I and II. Hence, improvement of these characters could possible through heterosis breeding or single plant selection at later generation after hybridization or two or more cycles of intermating among the selected segregants and to exploit the hidden genetic variability in heterozygous condition. 

Key words: Biparental progenies, North Carolina design II (NCD II), mean performance, gene action.