COMBINING ABILITY OF INBRED LINES DERIVED FROM DIFFERENT POPULATIONS OF MAIZE (Zea mays L.)
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Date
2013-06-30
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Abstract
A study was conducted to assess the combining ability of parents and heterosis of single
cross hybrids of maize. Six lines derived from Yellow pool and ten lines derived from Parbhat
were crossed to three testers in line × tester (L × T). The parents, 48 single cross hybrids along
with five commercial checks were evaluated in restricted randomized block design with three
replications at College of Agriculture, Bheemarayanagudi during rabi / summer 2012-13.
The combining ability analysis revealed presence of higher magnitude of SCA than GCA
variance for all characters. The ratio of GCA to SCA variance was lower than unity for all traits,
indicating higher dominance variance than additive variance in controlling the trait. Among 19
parents, P-21, YP-58 and KDMI-15 exhibited significant desirable gca effects for maximum
number of yield contributing characters and these parents were identified as the best general
combiners.
Hybrids exhibited significant variability for 13 quantitative characters studied. Out of 48
hybrids P-2 × NEI 9202B and YP-58 × KDMI 15 were found promising with significant sca
effects for grain yield and were early maturing as compared to the best private check 900M. It is
suggested to evaluate the identified hybrids in large scale trail to confirm their superiority
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