Genetic analysis to assess the physiological efficiency of parental lines in rice (Oryza sativa L.)
Keywords: Rice hybrids – parental lines – combining ability- yield and physiological traits
AbstractInformation on physiological potential of the genotypes is more important in the crop improvement programme, to evolve
hybrids suitable for aerobic cultivation. Four CMS lines and 22 male parents were subjected to combining ability analysis
and evaluated to identify the best combining parents for developing rice hybrids suitable for aerobic condition. The
investigation was carried out under aerobic condition using the line x tester mating design in three replications and studied
for different biometrical and physiological traits. The aerobic rice culture IR 72875-94-3-3-2 had high per se performance
for grain yield, yield traits followed by higher harvest index, SPAD values, relative water content, total dry matter and root
dry weight. The other genotype IR 71604-4-1-4-7-10-2-1-3 had superior performance for grain yield and for most of the
yield contributing traits, relative water content and root length. The hybrids involving IR 72875-94-3-3-2 namely IR 68886A
x IR 72875-94-3-3-2, IR 68888A x IR 72875-94-3-3-2 and COMS 14A x IR 72875-94-3-3-2 had higher grain yield under
aerobic condition. Similarly PSBRC 80, the male parent best suited for aerobic condition had better performance for most of
the traits like harvest index, high relative water content, total dry matter production, root dry weight and grain yield. PSBRC
82, the other aerobic culture also had, higher harvest index, leaf chlorophyll content, relative water content and grain yield.
The female parents IR 68888A and COMS 14A and the male parents IR55838-B2-2-3-2-3, IR 36, WGL 14 and WGL 32100
had good performance for most of the yield contributing traits and physiological parameters under aerobic condition. The
hybrids developed from these parental lines viz., IR 68888A x IR55838-B2-2-3-2-3, IR 68888A x IR 36, IR 68888A x WGL
14, IR 68888A x WGL 32100, COMS 14A x IR55838-B2-2-3-2-3, COMS 14A x IR 36, COMS 14A x WGL 14 and COMS
14A x WGL 32100 were found superior for most of the yield traits and physiological traits. Therefore, these parental lines
could be best utilized for developing high yielding hybrids suitable for water limited conditions.
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