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벼의 아종간 재조환 극대화를 위한 아종간 특이적인 DNA 마커 탐색
고희종 서울대학교 농업개발연구소 2000 농업생명과학연구 Vol.4 No.-
The subspecies-specific RAPD markers using 30 varieties(15 japonica, 15 indica) of various origin could be detected. Of the 526 random primers tested, 54 subspecies-specific DNA bands were identified. Although RAPDs were less polymorphic than URP(random eicosamer primer) bands, the proportion of subspecies-specific markers by RAPD was higher than those by by URP. 54 subspecies-specific markers consisted of 25 japonica-specific markers and 29 indica-specific markers. Rice varieties were classified into two discrete subspecies by subspecies-specific markers. The SPV(subspecies prototype variety) concept was introduced representing the typical varieties to each subspecies. 10 JPVs(japonica prototype species) and 4 IPVs(indica prototype species) were selected. The breeding lines from cross between Dasanbyeo(indica) and TR22183(japonica) was analyzed by selected subspecies-specific markers. All the lines turned out to be genetically closer to indica parent. Dasanbyeo.
고희종 서울대학교 농업개발연구소 2001 농업생명과학연구 Vol.5 No.-
Waxy rice lines of diversified qualities were developed by chemical mutagenesis and by introgressing the mutated genes for grain quality into waxy varieties. The low-amylose endosperm trait of a mutant line du-6 was expressed in case of homozygotic pairing of two independent recessive genes. The gene of low amylose endosperm of Du-7 showed a lethal effect on pollens and was transmitted into the progeny through only female parent. The flo(flourOy), su(sugary), and shr(shrunken) genes were transmitted to the F2 progenies independently with wx(waxy) gene. However, it was revealed that wx(waxy) gene was epistatic over du-1(dull) gene. Low-amylose mutant lines induced from the normal line had very low amylose content, 7.0∼10.4%. Sugary lines and giant embryo lines showed more lysine content. Giant embryo waxy lines revealed much more lipid content than the parent variety. Floury waxy and sugary waxy lines showed increased protein content, 9.0∼10.3%. Some waxy lines developed showed greater Ca^2+, Fe^2- and riboflavin content. Lines developed will be applicable for practical use as highly nutritive rices.
許文會,金弘烈,高熙宗 서울大學校農科大學 農業開發硏究所 1991 서울대농학연구지 Vol.16 No.1
벼에서 雜種强勢 이용 育種法은 中國에서의 성공적인 實用化와 더불어 現在의 收量 水準을 한 段階 올릴 수 있는 획기적인 育種法으로 평가되고 있다. 이에 本 稿에서는 雜種品種 硏究의 進行狀況과 今後의 展望 等을 벼에서의 雜種强勢 정도, 雄性不稔 및 稔性回復 體系, 雜種種子 生産 및 經濟性 等으로 구분하여 考察하였다. 그 結果를 要約하면 다음과 같다. 1. 지금까지 보고된 바로 벼에서의 收量 雜種强勢는 40% 정도를 기대할 수 있을 것으로 보이며, 收量構成要素 中에는 粒數의 增加가 收量 雜種强勢에 가장 크게 寄與하는 것으로 나타났다. 장차 Indica와 Japonica의 hybrid는 雜種强勢 水準을 크게 높일 것으로 보인다. 2. 細胞質 雄性不稔의 種類와 稔性回復因子 等을 검토하였고, 雜種品種 育成 體系를 單純化시킬 수 있는 方案들을 論議하였다. 3. 雜種品種 實用化의 관건이 되는 雜種種子 生産 現況과 自然交雜率 提高方案 等을 고찰하였고, 經濟性은 中國의 例를 검토하였다. Utilization of hybrid vigor in rice has been evaluated as an innovative breeding method to elevate the current yield-level, with the success in China. In this study, Current achievements and future outlook on hybrid rice were reviewed and discussed with the topics of extent of heterosis-level, the system of male sterility and fertility restoration, hybrid seed production, and the economical aspects. The results are summarized as follows; 1. The practical yield advantage over the best commercial cultivars might be 40%, and number of grains out of yield components was mainly responsible for the yield heterosis from the reports. It was expected that hybrids between Indica and Japonica might level up the heterosis extensively. 2. The system and genetics of cytoplasmic male sterility and fertility restoration reported in rice were reviewed. The feasible methods to simplify the system of breeding hybrid rice were estimated. 3. The status of hybrid seed production and the strategy for the improvement of natural outcrossing were summarized, and the economics of hybrid rice in China was discussed.