General (OCA) and specific (SCA) combining abilities and their
interaction with year were investigated in one set of F’s among eight inbreeds lines.
Significant OCA was detected in the combined anaL sis for most of the traits except
for the date of mid-silking. Also, significant SCA was detected for all traits with
the exception of ear height, ear length and mid-tasseling date. Both GCA.year
and SCA.year were significant only for mid-silking date, plant height and number
of kernels/row. Calculated ratios of GCA.year/GCA was higher than (he ratio
GCA*year/SCA for mid-silking date indicating that the additive and additive by
additive effects were highly influenced by year for this trait. As for plant height
and number of kernels/row, the ratio SCA,year/SCA was higher than
GCA*year/OCA indicating that the non-additive effects were more influenced by
year. Significant OCA by year interaction was detected for mid-tasseling date. On
the contrary, significant SCA by year interaction was detected for ear diameter and
grain yield/plain.
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