한국 품종배경 Dian형 일대잡종벼의 수량 잡종강세

Yield Heterosis of Dian-type Hybrid Rice with Backgrounds of Korean Varieties

In order to investigate the heterosis for yield in Dian-type hybrid rice with the backgrounds of the Korean rice varieties, six hybrid combinations between the Dian type cytoplasmic male sterile(CMS) lines, Hwayeongbyeo A and Nonghobyeo A, and the three restorer lines, YA3414-3-1-1-1-1, YA3416-1-1-1-wx3-1 and YA3428-2-1-1-2-1 were grown at the Experimental Farm of Yeungnam University in 2004. Twenty plants in the six hybrids, two CMS and maintainers, and three restorer lines were planted with the space of 15 cm × 30 cm in a randomized block design with two replications. The yield components; number of panicles per hill, number of spikelets per panicle, spikelet fertility and 1,000 grain weight, and milled rice yield were evaluated from 10 plants in each plot. The number of panicles per hill and spikelet fertility of the hybrids in Hwayeongbyeo A combinations, and the number panicles per hill and spikelet fertility of the hybrids in Nonghobyeo A combinations were increased significantly than those of their parents respectively. However, one thousand grain weight of the hybrids was almost same as their parents in the six hybrids. The heterobeltiosis of milled rice yield of the hybrids ranged 114-128% in Hwayeongbyeo A combinations, and 175-208% in Nonghobyeo A combinations. The standard heterosis over the standard rice variety Hwayeongbyeo ranged 114-128% in the Hwayeongbyeo A combinations and 107-127% in the Nonghobyeo A combinations.