Perubahan komponen varian genetikakibat dua siklus seleksi massa pada tanaman jagung manis (Zea mays saccharata Sturt)=The Relative Change of Genetic Variance Components After Two Cycles of Mass Selection in Sweet .....

ABSTRACT This research was aimed to find out the relative change of additive and dominance variances for several plant traits after two cycles of mass selection for reducing the time laps between pollen shedding and silking of sweet corn (Zea mays saccharata Sturt). Mating Design I (North Carolina Design l) of Comstock and Robinson was used and evaluation was done using a Randomized Completely Block Design with two replications. Sixty sets of size 27 x 5 m each were used to evaluate 576 crosses from three populations, so that each set contained 36 crosses. The relative change of additive variance of the trait to which selectio was applied was not significant, but tended to decrease with increasing cycles (eACO = 1,051+ 0,394"AC1 = 0,908 + 0,337 dan -` AC2 = 0,756+0,332). The additive variance of other traits were not significant too. The estimate of dominance variance of all traits from the three populations was not significant. Key words: variance estimates -- change of additive and dominance variances due to selection -- mass selectio