옥수수 登熟形質에 있어서 雜種强勢와 優性程度

Heterosis and degree of dominance in grain filling characters of corn

This study was carried out to estimate the heterosis and degree of dominance of duration and rate of grain filling in 8-parental diallel cross in corn. The heterosis for the duration of grain filling during the lag period was 87~116% (mean 97%), while the heterosis for the duration of grain filling during the effective filling period was 93~124% (mean 110%). Hybrids FR2A/KS42, FR2A/YUBC208 and FR2A/FR14A showed the highest heterosis for the duration of grain filling. Heterosis for the rate of grain filling during the lag period was 114~162% (mean 132%), while heterosis for the rate of grain filling during the effective grain filling period was 104~132%. In average, the heterosis for the rate of grain filling during the lag period was higher than that during the effective grain filling period. Degree of dominance for the duration of grain filling was partial dominance, complete or over dominance, while only over dominance was shown for the rate of grain filling in most of the hybrids tested. Parent with long or short duration of grain filling exhibited different degree of dominance depneding on the cross combinations, while parents with greater rate of grain filling showed dominance in all F₁ hybrids.