• 생명과학회지
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• 제10권2호
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• pp.177-181
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• 2000

This study was conducted to estimate the genetic parameters such as combining ability, heritabilities and correlation coefficients forsome agronomic characters by 6$\times$6 dialled crosses of barley. The results obtained were summarized as follows. Mean squares of general combining ability(GCA) and specific combining ability(SCA) were significant for all characters observed. Mean squares of general combining ability for all characters were expressed as higher values than those of specific combining ability. Jecheon #5 showed the high general combining ability effects for culm length, and Waegwanpimack #1 showed the highest general combining ability effects for tiller number. Cygne also showed the high general combining ability effects for spike length and 1,000 grains weight. Furthermore, Plumage was expressed with the highest general combining ability effects for spike length and 1,000 grains weight. Furthermore, Plumage was expressed with the highest general combining ability effects for number of grains per spike. In specific combining ability effects, Samdugjeonbug # 45$\times$Plumage showed the high value for culm length, and Suwon #6 $\times$Waegwanpimack #1$\times$ was expressed with the highest specific combining ability effects for tiller number. Jecheon #5$\times$Plumage also showed the high specific combining ability effects for spike length and number of grains per spike. Suwon #6$\times$Cygne showed the high specific combining ability effects for 1,000 grains weight. The heritabilities of spike length an number of grains per spike were over 90%. In correlation coefficients among characters, relationships between culm length and tiller number, culm length and spike length, culm length and 1,000 grains weight, and spike length and 1,000 grains weight showed highly positively correlation.

• 한국잠사곤충학회지
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• 제28권2호
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• pp.28-34
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• 1986

The general combining ability (GCV), the specific combining ability (SCA) and the reciprocal combining ability (RCA) effects wereobtained by 8$\times$8 diallel crosses of the silkworms with four Japanese races and four Chinese races, total eight lines. The result are as follows ; 1. The general combining ability (GVA) effects appeared high significant level in the total and the fifth instar periods (TP, FP), a female and a male cocoon weights (FW, MW), a female and a male cocoon layer weights (FL, ML) and a female and a male cocoon layer ratios (FR, MR). Only the reciprocal combining ability (RCA) effects appeared high significant level in the total and the fifth instar periods (TP, FP). 2. The Japanese original silkworm lines varied in the general combining ability effects from -0.864 to 0.578, and the Chinese original silkworm lines did in ones from -0.570 to 1.018. 3. The specific combining ability effects of the silkworm lines made in order of the crossing types of JL (Japanese lines) $\times$CL (Chinese lines)>CL$\times$JL>JL$\times$JL> CL$\times$CL in a total cocoon weights and a cocoon layer weights. 4. The reciprocal combining ability effects of the silkworm lines was in order of the crossing types of JL$\times$CL>JL$\times$JL> CL$\times$CL>CL$\times$JL in a total cocoon weights and cocoon layer weights.

• International Journal of Industrial Entomology and Biomaterials
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• 제10권2호
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• pp.153-157
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• 2005

Recently two breeding programs were carried out for isolation of new parental inbred lines in Iran. This study was undertaken in order to estimate the combining ability effects and heterosis of these lines. For this purpose an $8\times8$ diallel cross analysis including eight inbred lines of silkworm with four lines from each program were studied for their five quantitative traits. The results indicated that reciprocal effects appeared insignificant for most of traits. Japanese lines of 111 and 113 were best combiners for shell weight, cocoon weight and shell percentage traits. With respect to pupation rate, Chinese line 110 was the best and according to general combining ability (GCA) and specific combining ability (SCA) variances, it is superior in specific combinations. Hybrid $109\times110$ showed better characters for both productive and viability traits. Hybrids with high heterosis had high SCA too.

• 한국가금학회지
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• 제13권1호
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• pp.1-14
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• 1986

본 연구에서는 산란종계 육종개발에 필요한 기초자료를 얻기 위하여 산란종계 6계통을 양면교잡시켜 생산된 후대 3,759수를 가지고 교잡에 의한 잡종강세효과와 결합능력을 추정하였다. 공시계는 국립종축원 대전지원에서 보유하고 있는 White LKeghorn종 6계통에서 생산된 36개 조합의 양면교잡종을 이용하여 1984년 5월 11일부터 1985년 9월23일까지 500일간 수행하였으며, 수정율, 부화율, 육추율, 유성율, 성계생존율, 초산일령, 초산시 체중, 평규란중, 생존계산란율, 산란지수 및 사료요구율 등을 조사하였다. 조사된 각 형질에 대한 기록을 분석하여 교잡에 의한 잡종강세효과, 일반결합능력, 특수결합능력, 상반교잡효과 등을 추정하였다. 분석방법은 Griffing(1956)의 Model I 모형을 이용하여 추정하였다. 본 연구에서 얻어진 결과를 요약하면 다음과 같다. 1. 조사된 형질의 일반능력은 수정율이 94.76%, 부화율이 74.05%, 육추율이 97.47%, 육성율이 99.72%, 생존율이 93.81%, 초산일령이 150일, 초산시체량이 1,505g, 평균란중이 60.08g, 생존계산란율이 77.11%, 산란지수가 269.8개, 사료요구율이 2.44로 나타났다. 2. 잡종강세의 크기는 수정율에서 -1.66%로 부의 방향으로 나타났으며 부화율에서 9.58%, 육추율에서 0.26%, 생존율에서 1.83%, 초산일령에서 -3.87%, 초산시체중에서 3.63%, 평균란중에서 0.96, 산란율에서 4.23%, 산란지수에서 6.4%, 그리고 사료요구율에서 -0.85%로 나타나 수정율과 체중을 제외한 모든 형질에서 바람직한 개량방향으로 잡종강세효과를 보여 주었으며, 비교적 유전력이 낮은 부화율, 사란능력에서는 잡종강세효과가 컸고, 유전력이 비교적 높은 란중은 잡종강세효과가 적었다. 3. 결합능력의 분석에서 얻어진 결과는 다음과 같다. 1)수정율 일반결합능력, 특수결합능력 및 상반교잡효과는 중요하지 않은 것으로 나타났으며, 수정율은 유전적 요인보다는 환경적인 요인에 의해 영향을 많이 받는 것으로 나타났다. 부화율에서는 일반결합능력이 큰 비중을 차지하였으며 특히 K와 V계통의 상가적 유전효과가 크게 추정되었다. 2) 사료요구율과 평균란중은 일반결합능력이 특히 중요하였으며 특수결합능력과 상반교잡효과도 중요하게 나타났다. 사료요구율은 F, K, B 계통에서 우수하였으며, 란중은 F, B 계통이 우수하게 나타났다. 4) 초산일령은 일반결합능력, 특수결합능력 및 상반교잡효과가 모두 중요하게 나타났으며, V$\times$E, F$\times$K, B$\times$F의 교배조합이 우수하였고, 초산시체중은 일반결합능력이 특히 중요하게 나타났으며 특수결합능력과 상반교잡효과도 중요하게 나타났다. 초산시체중을 가벼운 쪽으로 개량하고자 할 때 K, F, E 계통이 우수하였다. 5) 산란율과 산란지수는 일반결합능력, 특수결합능력, 상반교잡효과가 모두 중요하였으며, F$\times$K, $A\times$K, $K\times$A 조합에서 우수하게 나타났다. 4. 일반적으로 일반결합능력이 중요하게 나타난 형질은 부화율, 초산시체중, 평균란중, 산란율, 산란지수, 사료요구율이었고 특수결합능력이 중요하게 나타난 형질은 육추율, 성계생존율, 초산일령, 산란율, 산란지수였으며, 상반교잡효과가 중요하였던 형질은 초산일령이었다.

• International Journal of Industrial Entomology and Biomaterials
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• 제24권1호
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• pp.7-16
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• 2012

To meet the local requirement i.e. the tropical stress of Andhra Pradesh and marginal farmers, twenty four new hybrid combinations were tested in Line x Tester method involving eight newly developed polyvoltine oval lines viz., MSO1, MSO2, MSO3, MSO4, MSO5, MSO6, MSO7 and MSO8 and three bivoltine silkworm breeds viz., APS12, APS45 and APS8 as testers. These hybrids were reared to evaluate their performance. Data for eight economically important metric traits viz., fecundity, cocoon yield per 10,000 larvae by number, cocoon yield per 10,000 larvae by weight, survival rate, cocoon weight, cocoon shell weight, cocoon shell ratio and filament length was recorded. General combining ability (gca), specific combining ability (sca) and heterosis were analyzed. Further, the relative merit of the hybrids for all the traits under study was also assessed adopting Evaluation Index method. Based on combining ability effects, heterosis and evaluation index, five hybrid combinations viz., MSO3 $\times$ APS45, MSO1 $\times$ APS12, MSO7 $\times$ APS8, MSO2 $\times$ APS45 and MSO1 $\times$ APS45 were selected for further evaluation in different seasons.

• 한국연초학회지
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• 제5권2호
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• pp.39-46
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• 1983

In order to obtain the basic information for the most successful breeding of Burley tobacco, these studies were performed on the correlations among agronomic characters and on the heterosis and combining ability in $F_1$ generation. Heterosis ratio was highly variable in different $F_1$ combinations. Positive heterosis was observed in all characters except days to flowering and yield showed the highest heterosis ratio. As the results of analysis of dialled table, the general combining ability (GCA) in all characters was shown to be significant . All characters except the number of leaves in the specific combining ability (SCA) were significant, Variety, L8, contributed negative GCA for all characters. Burley 21, ky 10 and ky 14 contributed negative GCA for leaf width, quality and yield, respectively. Hybrid of ky 10 x ky 14 showed negative SCA and hybrids of ky I0x L8 and ky 14 x L8 showed positive SCA for all characters. There were significant correlations between yield and number of leaves, leaf length, leaf width or leaf area. Correlation between yield and days to flowering was non- significant .

• International Journal of Industrial Entomology and Biomaterials
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• 제6권2호
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• pp.107-113
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• 2003

Analysis of combining ability is a widely used biometrical tool to select promising parents and hybrids, to determine the kinds and relative magnitudes of genetic variability among hybrids as well as to forecast yield attributes in early breeding generations both in plants and animals. Various statistical approaches like Jinks and Hayman (1953), Griffing (1956), Kempthorne (1957) etc. have been extensively applied in plants. These approaches have also been tried in the mulberry silkworm, Bombyx mori L. In the present review, an attempt has been made to collect most of the studies carried out on combining ability in silkworm at one place and make it available to the scientists engaged in sericultural research.

• 한국연초학회지
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• 제6권1호
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• pp.3-11
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• 1984

In order to obtain the basic information for the successful breeding of aromatic tobacco (Nicotiana tabacum L.), the heterosis, combining ability and gene distributions in 28 Fl hybrids by diallel crosses between Korea local and Oriental varieties were investigated. The yield were higher, stalk height, leaf length and leaf width were larger and days to flower was shorter for the Fl hybrids when compared to mid-parent. Estimates of general combining ability were significant for all characters investigated, and specific combining ability were significant for yield, stalk height, leaves Per Plant, leaf width and days to flower. In vr-wr graph, partial dominane was exhibited by all characters investigated.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2002년도 가을 학술발표논문집
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• pp.140-142
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• 2002

순수계통으로 유지되는 한국 재래닭 계통간 교배종의 산란형질에 대하여 일반능력과 잡종강세 및 결합능력을 추정한 결과 일반능력은 시산일령, 산란수 및 난중 등 모든 형질에서 순종에 비해 향상을 보였으며, 시산일령, 산란수, 난중 및 난각강도 등에서 접종강세효과가 높았다. 일반결합능력은 시산일령, 산란수, 난형지수 및 난각두께에서, 특수 결합능력은 산란수, 난중 및 난각 두께에서, 상반교잡효과는 산란수, 난형지수 및 난각두께에서 중요하게 나타났다. 형질에 따라 차이가 있었으나 순종에서는 Y계통, 교배종에서는 $Y\times$B조합이 결합능력효과가 높은 편으로 재래닭 개량의 자료로 활용될 수 있을 것으로 사료된다.

• 한국작물학회지
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• 제42권3호
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• pp.270-274
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• 1997

자포니카 벼 내염성 품종육성을 위한 모본들의 조합능력을 아는 것은 교배친의 선정과 육종효율면에서 대단히 중요하다. 본 연구는 유묘기 내염성 관련형질에 대해 내염성 정도가 다른 9개 품종을 가지고, 이면 교배를 실시하여 모본 및 F$_1$에 대한 유묘기 내염성 검정을 통하여 조합능력을 평가할 목적으로 수행하였다. 유묘기 내염성 평가형질에 대한 일반조합능력 및 특수조합능력은 친품종간 및 F$_1$간에 고도로 유의한 차이가 있었으며, 특히 일반조합능력이 특수조합능력보다 크게 나타나서, 여기에는 상가적 유전자작용이 비상가적 유전자작용보다 훨씬 크게 관여하고 있음을 알 수 있었다. 각 모본들에 대한 일반조합능력은 Gaori, Namyang 7 그리고 Agami M1 같은 내염성 품종들이 지상부 건물중 및 뿌리 건물중 감소율에서 모두 다른 친품종들에 비하여 우수하였다.