Abstract:
The study was conducted to evaluate six female parents (CMS lines) and 3 male parents
(testers) in a line x tester mating design at the research field of Sher-e-Bangla Agricultural
University, Dhaka, during November 2009 to March 2010 to estimate their combining and
heterosis. The data recorded on 18 F1 s and their parents for their combining ability indicated
that (ICA effect was significant for days to fifty percent flowering, plant height, No. of
siliqua per plant, seed per siliqua, primary branch & secondary branch per plant and seed
yield per plant . The specific combining ability (SCA) effect was significant for all the
characters. High ratio of SCA and GCA variance was observed, indicating preponderance of
non additive gene effects in the inheritance of the yield and yield relating characters under
study. Among the lines, CMS2, CMS3 and CMS5 were found as good general combiners.
But seven hybrids exhibited good specific combiner among eighteen hybrids. Different types
heterosis i.e. heterosis over mid parent (Hm), heterosis over better parent (Rb) and heterosis
over standard check (HC) were estimated to evaluate eighteen hybrids for seed yield and
yield related characters, where BARI Sharisha-7 was taken as check. The average heterosis
for seed yield of eighteen hybrids over mid parent was 19.26% and that of better parent and
standard check was 7.96% and 73.90%, respectively. Sixteen hybrids out of eighteen showed
higher plant height than the standard check variety.
Description:
A Thesis
Submitted to the Faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfilment of the requirements
for the degree of
MASTER OF SCIENCE
IN
GENETICS AND PLANT BREEDING
SEMESTER: Jan-Jun, 2010
