• 한국작물학회지
• /
• 제60권2호
• /
• pp.180-184
• /
• 2015

For waxy corn hybrid development, 23 waxy corn hybrids were planted and surveyed in both pericarp thickness and sugar content. Pericarp thickness showed average 50 to $49{\mu}m$ in field and greenhouse. Results like these advanced than previous other hybrids. Also, sugar content in developed waxy corn evaluated as 13.6 to 15.3 brix. Here, we concluded that edible quality of waxy corn depended on combing of two factors. Especially, CNU11H8 hybrid at field and CNU11H-38 at greenhouse were good in both factors. Accordingly, these hybrids will be planted in next time for productivity and area adaptation.

• 한국육종학회지
• /
• 제42권3호
• /
• pp.212-217
• /
• 2010

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.

• 한국작물학회지
• /
• 제60권2호
• /
• pp.185-189
• /
• 2015

A total of CNU 28 colored hybrids developed at the Chungnam National University were evaluated to identify new cultivars with functionality. These color waxy corn hybrids appeared to have high antioxidant activity. The SOD activity in the developed color waxy corn was high; CNU13H-3, in white hybrid, and CNU13H-44, in yellow hybrid, was 5% and 27% higher than the Yeonnong and Daehakchal Gold 1 of control hybrids, respectively. The DPPH activity in CNU13H-44, of yellow hybrid, and CNU13H-75 of purple hybrid were high as 32.6 mg/g and 40.1 mg/g, respectively. We have already reported that color hybrids have high antioxidant activity. In this study also was same results. On the basis of our findings, these hybrids will be planted in next time to compare their productivity and area adaptation.

• 한국육종학회지
• /
• 제41권3호
• /
• pp.279-283
• /
• 2009

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.

• 한국유기농업학회지
• /
• 제19권spc호
• /
• pp.6-8
• /
• 2011

In order to produce the organic foods in accord with international standard, organic seeds should be used in organic farming. This study was conducted to establish the stable production of organic seed of waxy com by examining the growing characteristics, seed yield, and the economy for seed production by organic farming. The optimal sowing timing for organic seed production of waxy com hybrid was within 10 days of the $1^{st}$ of May with yield of 88~90% of conventional seed production. The optimal planting density was 41,600 plants/ha ($80{\times}30$ cm) for organic seed production of waxy com. The weight of 100 seeds and seed productivity increased at the planting ratio of 2:1 mother plant:male plant. Growth and seed production were improved by removing male plant at 7~10 days after silking. Organic fertilizer (mixed oil cake) was applied at a rate of 4~6 Mg/ha before sowing. Black plastic mulching was used for weed control. In addition, sex pheromone trap and bio-control agents were used for safe pest control and low labour cost.

• 한국작물학회지
• /
• 제46권2호
• /
• pp.69-77
• /
• 2001

'Chalok 1/Cooktail 51' corns, supersweet corn gene controlled by either brittle-l (bt l) or shrunken-2(sh2) gene introduced into waxy corn, showed agronomic characteristics between supersweet corn and waxy corn. The ears were harvested at different development stages from 15 to 35 days after silking (DAS). Ear diameter of Cocktail 51 and 'Cocktail 51'/Chalok 1 increased from 15 DAS to 30 DAS and little increased thereafter, but that of Chalok 1/Cocktail 51 and 'Chalok l' increased until 35 DAS. Diameter of ear extension increased more in Cocktail 51 and Chalok 1/Cocktail 51 corn than Chalok 1. Ear fresh weight of Cocktail 51 decreased later 30 DAS but those of the other hybrids were vice versa. Rate of super-sweet kernels per ear of Chalok 1/Cocktail 51 corns was about 38 %. Development, and elongation of kernel were much more prominent in supersweet kernel than in waxy kernel, but fresh weight increased higher in waxy kernel than supersweet kernel. Moisture content in kernel decreased from 15 DAS to 35 DAS. Total sugar content of the kernel increased until 25 DAS, and that of Cocktail 51 kernel showed the highest among of them. After cooked by steam, flavor and mastication feeling rate cooked by steam of Cocktail 51 and Chalok 1/Cocktail 51 were increased from 15 DAS to 25 DAS and markedly decreased thereafter. But those of Chalok l/Cocktail 51 and, Chalok 1 were decreased after 30 DAS. These results suggested that the optimum harvest date for fresh supersweet corn (Cocktail 51), Cocktail 51/Chalok 1 seems to be about 20 DAS and Chalok 1/Cocktail 51 and waxy com (Chalok 1) was about 25 DAS.

• 한국육종학회지
• /
• 제40권3호
• /
• pp.250-257
• /
• 2008

Knowledge of genetic diversity and of the genetic relationships among elite breeding materials has had a significant impact on the improvement of crops. In maize, this information is particularly useful in i) planning crosses for hybrid and line development, ii) in assigning lines to heterotic groups and iii) in plant variety protection. We have used the SSR technique to study the genetic diversity and genetic relationships among 76 Korean waxy corn accessions, representing a diverse collection from throughout Korea. Assessment of genetic diversity among members of this group was conducted using 30 microsatellite markers. Among these 30 microsatellite markers, we identified a total of 127 alleles (with an average of 4.2 and a range of between 2 and 9 alleles per locus). Gene diversity at these 30 microsatellite loci varied from 0.125 to 0.795 with an average of 0.507. The cluster tree generated with the described microsatellite markers recognized two major groups with 36.5% genetic similarity. Group I includes 63 inbred lines, with similarity coefficients of between 0.365 and 0.99. Group II includes 13 inbred lines, with similarity coefficients of between 0.45 and 0.85. The present study indicates that the 30 microsatellite loci chosen for this analysis are effective molecular markers for the assessment of genetic diversity and genetic relationships between Korean waxy corn accessions. Specifically, this study's assessment of genetic diversity and relationships between a set of 76 Korean waxy corn inbred lines will be helpful for such activities as planning crosses for hybrid and line development and association mapping analyses of maize breeding programs in Korea.

• 한국작물학회지
• /
• 제60권4호
• /
• pp.470-474
• /
• 2015

공시된 교잡종에 대한 식물학적 특성, 잡종강세와 유전적 거리 및 종실특성에 대한 분석 결과는 공시 교잡종에 대한 간장은 CNU H09-26에서 228.5 cm, CNU H09-30에서135.2 cm 범위로 큰 변이를 나타냈으며, 착수고 역시 CNU H09-23에서는 78.2 cm, CNU H09-30에서 22.1 cm으로 교잡종간에 큰 차이를 보였다. 이삭길이는 공시종 중에서 CNU H09-26에서 21.2 cm로 가장 길었고 CNU H09-13에서 10.8 cm로 가장 작게 나타났다. 아밀로 그램의 특성 중에서 호화개시온도는 CNU H09-23의 $71.1^{\circ}C$로 가장 낮은 온도에서 호화가 시작되었으며 식미가 우수한 반면 CNU H09-7은 $76.0^{\circ}C$로 호화온도가 가장 높았다.

• 한국육종학회지
• /
• 제43권1호
• /
• pp.62-67
• /
• 2011

식용 찰옥수수에 대해 소비자의 기호성과 기능성이 고루 높고 가공적성이 우수한 복합 신품종을 육성하고자 현재 재배되고 있는 장려품종을 대조구로 하여 총 15개 교잡종을 아밀로그램 특성, 항산화성 및 식미관련 종실특성을 분석한 결과는 다음과 같다. 1. 공시된 교잡종에 대한 아밀로그램 분석결과 식미에 유리한 최고 점도 및 강하 점도는 CNU08H-69 교잡종에서 각각 115.9와 53.8RVU로 가장 높았고 CNU08H-h121과 일미 찰이 각각 51.6와 18.6 RVU로 가장 낮았다. 2. 항산화성을 나타내는 DPPH 자유 라디칼 소거능에 대한 전자 공여능을 측정한 결과 50 ppm과 20 ppm농도에서 CNU08H-15와 CNU08H-69 교잡종의 EDA값이 가장 높았으나 CNU08H-h102는 가장 낮게 나타났다. 3. 물성 검정 결과 경도는 CNU08H-35가 1604.6으로 가장 높았고, 대학찰골드 1호와 연농찰에서 각각 515.6과 694.4으로 매우 낮게 나타났다. CNU08H-35의 껌성과 씹힘성은 각각 209.2과 169.3으로 가장 높은 반면에 CNU08H-h105에서는 각각 57.8과 35.3으로 가장 낮은 값을 나타났으며, 대조구인 대학찰골드 1호는 이들 모두에서 매우 낮았다.

• 농업과학연구
• /
• 제27권2호
• /
• pp.81-85
• /
• 2000

식용찰옥수수의 적정 저장온도를 구명하기 위하여 당함량 및 수분함량 변화를 국내에서 및 육성한 찰옥 1, 2호 및 대학찰에 대해 조사한 결과는 다음과 같다. 공시된 찰옥수수 교잡종의 식물학적특성은 대학찰에 비해 찰옥 1호, 2호에서 개화기가 약간 빨랐고, 이삭 길이는 찰옥 1, 2호가 짧고, 이삭 직경이 굵은 반면에 대학찰은 간장 및 이삭길이에서 다소 컷으나 이삭직경과 이삭 열수에서 낮게 나타났다. 공시된 교잡종 찰옥수수의 수확시 당도는 대학찰이 크게 높았으며, 찰옥 2호, 얼룩찰순으로 높게 나타났는데 상대적으로 저장기간이 길수록 저장온도에 거의 무관하게 급 감소하는 경향인 반면에 수분함량의 변화는 크게 변화되지 않았다. 이들 교잡종의 신선도 및 고품질을 유지하기 위해서는 $-4^{\circ}C{\sim}-10^{\circ}C$에서 저장하는 것이 유리하였다.