Vol. 11, Issue 11 (2022)

The present investigation was executed at the experimental plot of Birsa Agricultural University, Kanke under the rainfed conditions of Jharkhand, India during kharif 2021 in the F7 generation seeds of the cross Pusa-1176 x BPT-5204 sown as panicle to progeny rows at two different dates as set I and set II with the interval of 15 days in order to study the influence of environment on the traits under study. The research has been chiefly emphasized on the study of genetic behaviour and segregation pattern of the awn characters in rice which includes presence of awns and awn colour. The observations were recorded morphologically in the F₇ generation families of the cross Pusa-1176 and BPT-5204and thereafter, expected genetic ratios have been computed based on the observations recorded using chi-square test. The genetic ratios obtained from the segregating families were monogenic as well as digenic for both the awn characters concluding that it is governed by single gene or two genes depending on the segregation pattern. Hence, the results showed that family no. 42, 44, 62, 83 and 84 for the trait presence of awns and family no. 42, 44, 62, 72, 211, 288 and 309 for awn colour showed varied segregation pattern in set I and set II revealing the effect of changes in temperature and photoperiod. But the respective segregation ratio was found similar in the family no. 84 and 230 for the presence of awns and family no. 83, 84, 230 and 275 for awn colour in both the sets concluding that the behaviour and expression of genes were persistent and remained unaffected by the environmental fluctuations.