A new waxy corn hybrid ‘Daedukchal 1’ was developed from single cross between CNU 504 and CNU 2396 at Chungnam National University in 2007. Inbred CNU 504 used as a seed parent and inbred CNU 2396 as a pollen parent were collected throughout domestic regions. Tasseling date of this hybrid was seven days later than that of check hybrid, ‘Chalok 1’. ‘Daedukchal 1’ was 19.7 cm in ear length and 4.5 cm in ear diameter. On yield trial, ear length of this hybrid was increased 29.7% compared with a check hybrid, ‘Chalok 1’. ‘Daedukchal 1’ had white kernels and good eating quality due to high sugar content and thinner pericarp. The ratio of kernel set length/ear length was similar to ‘Chalok 1’. It is moderately resistant to southern leaf blight and northern leaf blight but susceptible to corn borer. The yields of ‘Daedukchal 1’ in fresh ear weight and in number of fresh ear were 16% and 8%, respectively, higher than those of a check hybrid in regional yield trials for two years. Seed production for this hybrid was better because of the consistency of tasseling dates.

Inbred lines were gained from corn genetic resources collected by our lab and also deveolped by our Corn Breeding Lab. Materials used were eleven hybrids including yellow waxy corn hybrid CNU19 (applied as Daehakchal Gold 1 in 2007). These hybrids were harvested at 30th day after fertilization for antioxidants activity analysis; polyphenol compounds, inhibitory effect of xanthin oxidase activity, catalase activity, superoxide dismutase activity and DPPH radical scavenging activity. Daehakchal Gold 1 among hybrids were midseason variety and higher than check Chalok 1. The ratio of ear height to stem height was low as 50% below. Kernel set ratio was also higher than check hybrid. Among antioxidant analysis, Polyphenol compound was the highest in Daehakchal Gold 1 (CNU 19) as 3.77μg/ml, and CNU 21, CNU 93 and CNU153 including check were high trend compared to others. Xantine oxidase(OX) catalase activity, SOD activity and DPPH radical scavenging effect by using methanol extracts were also comparatively higher in CNU 19 hybrid than others. Besides, catalase activities of Daehakchal Gold 1 hybrid extracted by methanol and haxane were higher than other hybrids. From experiment results, this hybrid was superior to other used hybrids in botanical character, table quality and funtion.

A new yellow waxy corn hybrid "Daehakchal Gold 1" was developed from single cross between Yeongdeok Jaera and Okchen Jaera at Chungnam National University in 2007. Inbred CNU57 derived from Yeongdeok Jaera was used as the seed parent of Daehakchal Gold 1, and inbred CNU 27 derived from Okchen Jaera as the pollen parent. Tasseling date of this hybrid was seven day later than that of check hybrid, Chalok 1. Daehakchal Gold 1 was 19.7cm in ear length and 4.5cm in ear diameter. The yield of Daehakchal Gold 1 and check hybrid in dry matter were 146.5g and 113.9g per plant, respectively. On yield trial, which were increased 29.7% compared with a check hybrid, Chalok 1. Especially, Daehakchal Gold 1 had yellow kernels and good eating quality. The ratio of kernel set length/ear length was similar to Chalok 1. It is moderately resistant to Bioporalis maydis and corn borer. The yields of Daehakchal Gold 1 in fresh ear weight and in number of fresh ear were 16% and 8%, respectively, higher than those of a check hybrid in regional yield trials for three years. Seed production of this hybrid has gone well due to good match during crossing between seed and pollen parents.