Breeding brittle super sweet corn using tropical germplasm : 열대유전자원을 이용한 brittle 초당옥수수 신교잡종 육성

국문 초록 (Abstract)

본 실험은 열대지역으로부터 도입된 brittle 유전자원을 이용하여 초당옥수수 신교잡종을 육성하고자 수행되었다. 2002년에 생산된 147개의 교잡종에 대하여 동국대학교 실험농장에서 포장실험을 하였으며 그 특성을 조사하였다.
1. 출웅기의 범위는 65.7일부터 79.0일까지 였으며, 출사기도 이와 비슷하였고, 출웅기와 출사기의 평균은 각각 71.8일, 72.5일 이었다. 20여 품종은 대조품종보다 빠르거나 비슷하였다.
2. 초장의 범위는 168.3cm에서 238.3cm, 착수고는 43.3cm에서 95.0 cm로 나타났으며, 초형에서는 대조품종보다 우수하거나 유사한 6개 교잡종 (67, 68, 70, 71, 72, 75)을 선발하였다.
3. 조사형질간의 상관관계분석에서는 개화기와 초장 (0.42), 착수고 (0.32)간에는 정의 상관관계를 개화기와 초형 (-0.29)간에는 부의 상관관계를 보였고, 초형과 수형 (0.43)간에는 고도의 정의 상관관계를 보였다.
4. 풋옥수수에서 가장 중요한 형질인 이삭형태와 초형의 수치를 기준으로, 대조품종인 'Cambella 90'과 유사 또는 우수한 20여 신교잡종을 선발하였다.

다국어 초록 (Multilingual Abstract)

The brittle super sweet corn germplasms, which were introduced from the tropical region, were crossed to su inbred lines to improve photoperiod sensitivity and some agronomic characters, such as flowering date, plant characters, and ear characters. After crossing, F1 was selfed to produce inbred lines adapted in temperate region by ear-to-row method until S_(5)∼S_(6) generations. In 2002, inbred lines were crossed to each other within the same flowering time and 137 brittle sweet corn hybrids were produced at the Agricultural Experimental Station of Dongguk University. The objectives of this study were both to evaluate their agronomic performance and select new superior brittle super sweet hybrids.
Days to tasseling (TASS) of 88 new hybrids was between 65.0 and 79.0 days. Days to silking (SILK) was similar to days to tasseling. The means of TASS and SILK were 71.8 and 72.5 days, respectively. The plant height ranged from 168.3cm to 238.3cm and the ear height ranged from 43.3cm to 95.0cm.
Since sweet corn is often consumed directly in the ear, ear traits, such as ear aspect, the number of kernel rows, row configuration (straightness and arrangement), tipfill, and ear size, are critical for fresh market. Among them, ear aspect (EA) would be the most important character to be considered during the selection for elite hybrids. Hybrid 75 showed superior EA
Highly significant correlation coefficients were observed between TASS and SILK (0.57), plant height (PH: 0.42), ear height (EH: 0.32), and plant aspect (PA; -0.29). SILK was highly significantly correlated with PH (0.39). Relations between TASS, SILK and other traits were important for the selection of early-maturing hybrids. TASS and SILK showed negative correlation coefficients with PA.
Based on the plant and ear aspects, 20 hybrids were selected. Among selected 20 hybrids, hybrid 2 and 101 were earlier in maturity than 'Cambella 90'. Although there were many superior hybrids, they need further evaluation for commercial use. Disease and various stress resistances and yield trial tests should be carried out under different environmental conditions.

목차 (Table of Contents)

• Table of Contents = iii
• List of Tables = ⅳ
• Abstract = 1
• Introduction = 3
• Materials and methods = 8
• Results and discussion = 10
• Literature cited = 20
• 摘要 = 27