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RISS 인기검색어
- 검색키워드
- 저자 : M.S. LIM(林茂相) (검색결과 4 건)
- 무료
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水稻의 耐冷性에 關與하는 몇가지 形質의 遺傳에 關한 硏究
J.K. SOHN(孫再根),G.S. CHUNG(鄭根植),M.S. LIM(林茂相) 한국육종학회 1979 한국육종학회지 Vol.11 No.1
In order to determine the inheritance of several characters related to cold tolerance in rice, F₁ hybrids were made by diallel cross among six rice varieties slowing the different reactions for cold tolerance. Parents, F₁ and F₂ plants were subjected to low temperature of 10℃ for 10 days in the phytotron at seedling stage. Another set of hybrid populations planted lately in field to distinguish the degree of leaf discoloration in late autumn. Most of crosses that crossed with M₁49 and IR800-14-3-2 showed relatively high specific combining abilities in cold tolerance. The results of Fl diallel analysis and the segregation mode of F2 plants for cold tolerance at seedling stage showed that cold tolerance was complete dominance aver cold susceptibility. In case of leaf discoloration in the field, the segregation mode also agreed with simple inheritance ratio(3 : 1). But it has not indentified that these segregation ratio can be agreed with those under different temperature conditions and those of much more cross combinations. In Vr-Wr graphical analysis, M₁49 and IR800-14-3-2 appeared to be contained most of dominant genes for cold to lerance, while IR1317-392-1-2-2 contained most of recessive genes. In the inheritance of days to heading of parents in the late season culture, early maturity showed partial dominance over late maturity. It was demonstrated that several combinations crossed with cold tolerant variety, IR800-14-3-2 or M₁49, had relatively high s.c.a. effects for early maturity.
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M.S. LIM(林茂相) 한국육종학회 1981 한국육종학회지 Vol.13 No.2
Several investigations were undertaken with 78 rice varieties of Korean leading cultivars and some important breeding materials to clarify the nature of heading fluctuations due to the different sets of the climatic conditions with years and seasons, to estimate the heading duration from transplanting to heading under various locations and seasons in rice culture, and to classify the understandable ecotypes of the Korean rice varieties for rice breeders and agronomists in Korea. Twenty-day seedlings were transplanted in the paddy field from early May to August with 10-day intervals under the ordinary fertilization. Heading dates were recorded and analyzed with the climatic factors on the varietal bases. The results obtained are summarized as follows: 1. The standard partial regression analysis for the effect of the climatic factors affecting to the heading durations indicated that there were single and interaction effects among the various climatic factors to the heading duration. 2. The covariance analysis revealed that there were not any significant interactions among average air temperature, sunshine hours, and day length. Thus these three factors were mainly used for the multiple regression equations to estimate the growth duration of the rice cultivars in Korea. 3. The climatic index in terms of number of days, which affect the growth duration of the individual varieties, were estimated through six years. 4. The year variations of heading duration were great as well as the seasonal variations, and the degree of variations differed from variety to variety. 5. The critical temperature which did not affect the heading duration was estimated as 18.2℃. Most of the Korean rice varieties showed their shortest growth duration under the day length of 13.5~14.5 hours, which suggested that most of the Korean rice varieties were little sensitive to the photo-period while more than half of the tested varieties were affected in their heading duration by the day length at significant levels. 6. Except some inadequate Hokkaido varieties and the non-sensitive varieties, the heading durations could be estimated by the regression equations when adapted them to the individual varieties. 7. The regression equations obtained both through several years and various seasons on the varietal bases could be adapted to the areas within the latitude of 37±3°N, regardless of the years and seasons. 8. The regressions obtained from the specific year were well adapted to the year but the regressions from the long-term experiments were adapted much better to wide range of years am seasons even though there were deviations. 9. From the regression equation on the individual variety, the range of adaptable locations could be justified and the heading delay due to the irregularly fluctuated temperatures on the variety could be estimated. 10. The ecotypes can be classified into 29 groups based on their basic vegetative growth duration, relative eliminable growth duration, and significance of the photo and thermo effect to the heading duration within the range of tested varieties and climatic regulations under field conditions in Korea. In this case, only 18 groups of the ecotypes could be adopted to the 78 tested varieties.
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