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보리 出穗期의 臨界日長의 究明과 日長變動에 따른 組合能力에 관한 硏究
D. J. MAENG(孟敦在),C. H. CHO(曺章煥),B. K. KIM(金鳳九) 한국육종학회 1980 한국육종학회지 Vol.12 No.3
4×4 barley diallel set of cross was tested to study the heading responses under 9-, 11-, 13-, 15-, and 24-hours day conditions and under critical turning point, and to obtain the information for earliness of crossing materials on basis of general and specific combining ability. Critical turning point for heading was expressed under long day condition in. Suweon 4, Suweon 18 and their F₁-hybrids with late heading, while it was showed under short day condition in Haganemugi(11.35 hour). However, critical turning point of F₁-hybrids of Haganemugi was under long day-length condition. Barsoy had the intermediate critical turning point for heading, and its F₁-hybrids revealed shorter critical turning point rather than their parents. All parents and F₁-hybrids headed earlier under long day conditions than under short day conditions. Among the parents the earliest heading was obtained from Haganemugi followed by Barsoy, Suweon 4 and Suweon 18 under all day-length conditions except critical turning point. Positive correlations were obtained between days to heading of parents and of F₁-hybrids, especially appearing the higher correlations under short day conditions. This indicates that mid-parent value gives good predictions of F₁-hybrid values for headings. General combining ability is much more important than specific combining ability for headings, which is mostly controlled by the additive gene action under all day-length conditions including critical turning point. Suweon 4 and Suweon 18 were poor combiners, while Haganemugi and Barsoy were good combiners under all day-length conditions except Haganemugi was expressed as a poor combiner under critical turning point for earliness. For the development of early varieties in heading it is not only necessary to assemble the early genes into particular progenies by early heading varieties with great effect of GCA, but also it is important to diversify the constitution of early genes by crossing between different varieties with extensive genetic background for earliness.
麥類의 世代促進方法에 關한 硏究 Ⅲ. 秋播栽培와 夏季栽培에 따른 小脈 F₂ 雜種集團의 主要形質 比較
C. H. CHO(曺章煥),D. J. MAENG(孟敦在) 한국육종학회 1978 한국육종학회지 Vol.10 No.1
In the experiment for studying the changes of genetic constitutions of main characteristics as using the two F₂-wheat hybrid populations under the quite different environmental conditions of Suweon winter cropping and Daekwanrung summer cropping, wider variations and amounts of variance of heading date showed under Daekwanrung summer cropping conditions than under Suweon winter cropping conditions. However, longer culm and more number of grains per spike, and wider range of variation of their characteristics were obtained under Suweon winter cropping conditions. These were high significances of F-test in variance of culm length and number of grains per spike between the two conditions. In the F₂-wheat cross of Chugoku 81/Chinkwang × Yecora F 70, calm length was correlated with heading date, spike length and number of grains per spike, and in another wheat cross of Chugoku 81 × Suweon 203, there were the positive siginificant correlations between the main characteristics except the relation of heading date and number of grains per spike.
理想型 小麥品種育成을 위한 生理生態的 形質構成에 關한 硏究
Y.N. SONG(宋隆男),G.E. LEE(李基誼),C.H. CHO(曺章煥),D.J. MAENG(孟敦在),J.H. NAM(南重鉉) 한국육종학회 1982 한국육종학회지 Vol.14 No.2
This study was conducted to clarify the composition of the physiological and ecological components for improving ideotype of wheat. Ideotype of ecological characteristics of wheat will be desired to recombine early maturity, two semidwarf genes with erect plant type about 70~80㎝ height, less stem elongation by late spring, long spike, many spikes per ㎡ and many grains per spikelet. Also, physiolo gical ideotype of wheat will be desirable to recombine 6.4~6.8 of LAI, high chlorophyll content from regrowing period to April 21 (total 15.0~18.9), after that slightly even after heading, high NAR (9.5g/㎡/day), 40~48 percentages of dry weight ratio for spike to stem and leaf brade with good plant type.