多穗多蘖性 옥수수 硏究 Ⅵ. IK 自殖系統의 導入系統과의 組合能力

Maize with multiple ears and Tillers(MET) Ⅵ. Hybrid perfermance of IK inbred with exotic lines

This experiment was conducted to develop hybrid corn with tillers. Seven hybrids, which were made from crosses among the three derived lines from Korean local maize lines(IK₁, ₂, and IK₃) and two exotic inbreds(PI213749 and Teosinte), were compared with check hybrids(P3160). Tasseling days of tillered hybrids were generally delayed by 7 days, while stem height of hybrids tillering were similar and ear height were high compared with check hybrid. Number of tillers per plant in all tillering hybrids were about 4.0, but effective tiller of these was only 2 to 3. Average ears per plant were about 5. Especially, ear size and seed set of IK₂/PI213749 of these hybirds were very promising. Accordingly, yield per 10a of these tillered hybrids wad also higher than that of check hybrid. Fresh weight per 10a was 10.3tons in IK₂/PI213749. Dry weight of these hybrids(1.7tons) was significantly higher than that of the check hybrid(1.2 tons). Correlation coefficients between fresh weight and tillers per plant, and stem height, and tillers per plant were very high, and between yield per 10a and ears per plant, and kernels weight per plant, and ear weight per plant, and 100 kernel weight were also high. Estimated heritabilities of tillers per plant and ears per plant were very low but heritabilities for other characteristics were very high. The contribution of ear weight and tillers upon yield per 10a were assumed to be the most influential characteristics by path coefficient analysis. However, these characteristics were regared as a effective selection marker for the hybrids development with multi-ear and tillers.