Abstract:
The study was conducted to evaluate five female parents (lines) and eight male
parents (testers) in a line x tester mating design at the research field of Sher-e-Bangla
Agricultural University. Dhaka during November 2011 to April 2012 to estimate their
gene action and heterosis. The data recorded on 40 F1 's and their parents for their
combining ability indicated that GCA effect was significant for plant height, primary
branches and secondary branches per plant, days to fifty percent flowering, days to
fifty percent maturity, no. of siliqua per plant, length of siliqua, seeds per siliqua,
thousand seed weight and seed yield per plant. High ratio of GCA and SCA variance
was observed indicating preponderance of non additive gene effects in the inheritance
of the yield and yield contributing characters under study. Among the lines Nap 9908
and Nap 94006 were found as good general combiners. Among 40 hybrids 16 were
found as good specific combiner for yield and other characters. Different types of
heterosis i.e. heterosis over mid parent (1-Im), heterosis over better parent (Hb) and
heterosis over standard check (He) were estimated to evaluate forty hybrids for seed
yield and yield contributing characters. The average heterosis for seed yield of forty
hybrids over mid parent was 3.27% and that of better parent and standard check was
-9.72% and 5.60% respectively.
Description:
A Thesis
Sufimited to the Faculty of Agricufture,
Sher-e-Bangla Agricultura University, Dhaka,
in partial filfillment of the requirements
for the Degree of
MASTER OF SCIENCE
IN
GENETICS AND PLANT BREEDING
SEMESTER: JULY-DECEMBER, 2012
