Variance components, correlation and path analyses in cowpea (Vigna unguiculata L., Walp)

Aliyu Olawale Mashood,Tiamiyu Adeyemi Odunola,Usman Muinat,Abdulkareem Yusuf Folorunsho 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.2

Cowpea as a low-input crop has a potential to signifcantly ameliorate poor nutrition and food insecurity in sub-Sahara Africa if problem of poor seed yield is addressed. Adequate information on the relationship between yield components and seed yield is, however, crucial for the development of better quality varieties to improve farmers’ feld yield. To this end, twelve cowpea accessions of diferent seed sizes and mixed pedigrees were evaluated for two years in feld trials of three replications laid out in a randomized complete block design. Data collected on plant vigour indices, yield components and seed yield were analyzed for variance components, Pearson correlation coefcient and structural equation modeling for path analysis. The accessions exhibited signifcant variation for all yield components including seed yield. In addition, the variance estimates indicated that substantial variations recorded were mostly genetic with high heritability values. Earliness in fowering and pod maturity recorded highly signifcant correlations and direct efect with yield components and seed yield. Positive correlation between precocity and high yield could be exploited in the development of improved varieties with early maturity for the savannah ecology with a characteristic short wet season. Importantly, all seed yield components are signifcantly correlated with each other and to total seed yield. Pods per plant, however, recorded highest coefcient values (r=0.85; P<0.001; 1.38**) for both Pearson correlation and path analysis, respectively, suggesting its importance as a yield component with highest direct efect on seed yield and should be a core selection index in cowpea breeding. The efect of size-number trade-of accounts for the counter-balance of direct efects of seeds per pod/plant (number) and seed weight (size) in cowpea and should be determined on genotype and/or seed size basis during selection. Plant vigour characters had no direct contribution to seed yield.

J2와 J3 불변량에 기초한 비대칭 항복함수의 제안(II)

김영석,눙엔푸반,안정배,김진재 한국소성∙가공학회 2022 소성가공 : 한국소성가공학회지 Vol.31 No.6

The yield criterion, or called yield function, plays an important role in the study of plastic working of a sheet because it governs the plastic deformation properties of the sheet during plastic forming process. In this paper, we propose a modified version of previous anisotropic yield function (Trans. Mater. Process., 31(4) 2022, pp. 214-228) based on J2 and J3 stress invariants. The proposed anisotropic yield model has the 6th-order of stress components. The modified version of the anisotropic yield function in this study is as follows. The proposed anisotropic yield function well explains the anisotropic plastic behavior of various sheets such as aluminum , high strength steel , magnesium alloy sheets etc. by introducing the parameters α and β, and also exhibits both symmetrical and asymmetrical yield surfaces. The parameters included in the proposed model are determined through an optimization algorithm from uniaxial and biaxial experimental data under proportional loading path. In this study, the validity of the proposed anisotropic yield function was verified by comparing the yield surface shape, normalized uniaxial yield stress value, and Lankford's anisotropic coefficient R-value derived with the experimental results. Application for the proposed anisotropic yield function to AA6016-T4 aluminum and DP980 sheets shows symmetrical yielding behavior and to AZ31B magnesium shows asymmetric yielding behavior, it was shown that the yield locus and yielding behavior of various types of sheet materials can be predicted reasonably by using the proposed anisotropic yield function.

콩 논·밭 재배에서 수량예측을 위한 생육과 수량 관련 형질의 비교

조영손,박호기,김욱한,김석동,서종호,신진철 韓國作物學會 2006 한국작물학회지 Vol.51 No.7

논과 밭에서 콩 생산성과 생육 형질들의 측정치의 관계를 알아보기 위해 시험을 수행한 결과는 다음과 같다. 1. 단위면적당 콩 수량은 논보다 밭에서 높은 경향 이였으나 개체당종실수는 밭에서 100립중은 논에서 높은 경향이였다. 논에서 태광콩의 수량이 가장 높았고 대원콩과 황금콩 순으로 높은 경향을 나타냈다. 밭에서는 황금콩에서 가장 높은 수량을 기록했고 대원콩과 태광콩 순으로 높았다. 2. 밭에서 수확지수는 태광콩과 황금콩이 논보다 높았고 대원콩은 논에서 밭보다 유의성은 없었으나 높은 경향이었고, 전체적으로 대원콩이 논 밭 모두에서 가장 높았다. 3. 100립중은 태광콩은 유의성이 없었으나 대원콩은 밭에서 황금콩은 논에서 높았다. 4. 엽의 녹색도는 논과 밭 재배조건 모두 파종 후 4주차부터 감소되었으나,논의 경우는 6주차까지 감소하였고, 그 이후 증가하였으며 밭의 경우는 5주차에 가장 낮은 값을 기록한 후 6주차부터는 상승하였다. 5. 지상부 건물중, 협 건물중, 협수, 경장, 경직경은 태광콩과 황금콩이 밭보다 논에서 높았으며 대원콩은 밭에서 높은 경향이었다. 6. 협 생체중은 논 밭 모두 파종 후 9주차부터 점차 상승하였으나 1 cm 이하의 협수는 논에서는 12주차, 밭에서는 11주차 이후에는 세 품종 모두 증가되지 않았다. 7. 작물생장율(CGR)은 논재배콩이 밭보다 파종후 8주차 이후부터 높은 경향이었고, 13주차에서는 대원콩이 타 품종들보다 월등히 높았다. 밭에서는 파종후 12주차부터 15주차까지 태광콩, 대원콩, 황금콩 순으로 높았다. 8. 개체당종실수와 수량간의 상관은 논 밭 모두 고도의 정상관을 보였다. 9. 엽면적과 지상부 건물중은 논에서는 파종후 5주차를 제외한 4-15주차 사이에 0.8내외의 고도의 정의 상관을 나타냈으나, 밭에서는 4, 5주차에서 상관이 낮았고 나머지 기간에는 논과 같은 양상을 보였다. 10. 엽면적과 지상부 건물중과의 상관은 논 밭 모두 고도의 정의 상관을 보였다.이 좌우되는 것으로 볼 수 있다. 또한 질소흡수량이 같더라도 총영화수와 수량은 연차간에 차이를 보였다.rotease 활성과 생물학적 기능의 상관관계를 이해하는데 활용될 수 있을 것이다.V는 앞으로 바이러스와 기주의 다양한 상호관계를 이해하는데 있어서 중요한 병원학적 성질을 가지고 있는 것으로 생각되었다.>300℃ 이하, 공정압력 1 Torr, 그리고 bias전압과 기체 혼합비를 변화시키면서 증착하였다. 증착시 in-situ OES 분석결과 플라즈마 내의 질소종의 함유량 변화에 따라 증착속도가 크게 변화됨을 알 수 있었고, 많은 질소기체를 인입하면 질소종이 많아지지만 증착률은 급격히 감소하였고 박막내 탄소의 함량이 커지면서 막질이 비정질로 바뀌고 미세경도 또한 감소함을 알 수 있었다. 이는 in-situ 플라즈마 진단분석이 전체 PEMOCVD 공정에 있어서 대단히 중요하고, Ti(C,N)과 Hf(C,N) 코팅막의 탄소함량과 미세경도는 플라즈마내의 CH과 CN radical종의 세기에 크게 의존함을 의미한다. 그리고 Hf(C,N) 박막의 경우도 Ti(C,N) 박막의 경우와 유사하게 최대 미세경도값(2460Hk0.025) 이 -600 V bias 전압과 10% 질소기체 혼합비를 사용한 경우에 얻어졌고, 이는 박막이 주로(111) 방향으로 성장됨에 기인한 것으로 사료된다.통해 평가한 염증세포 분포 점수에서 III 군이 1.6±0.6 으로 I 군 2.8±1.2 에 비해 통계적으로 유의하게 낮았다(p<0.05). 결론: 압력 조절형 출혈성 쇼크 모델에서 시행한 저체온법은 정상체온을 유지하고 있는 군에 비해 쇼크 상태에서의 기초대사량을 줄여줌으로써 허혈에 의한 조직의 직접적인 손상을 억제할 수 있으리라 생각된다. 또한 저체온법은 수액의 사용량을 줄여주고 IL-8등의 싸이토카인 분비를 억제시키며 백혈구의 침윤을 줄여 The experiments were carried out to develop simulation model for estimating the yield of soybean in upland and paddy field condition. Field experiments were done at National Institute of Crop Science in 2005. The evaluated soybean cultivars were Taekwangkong, Daewonkong, and Hwangkeumkong. Soybean seeds were planted by hill seeding with 3-4 seeds and row and hill spacing were 60~times10cm in upland and 60~times15cm in paddy field. Seeds were sown on row (without making ridge) and on the top of ridge in upland and paddy field, respectively. Field parameters were measured yield components (plants/m2 , pod no./plant, and 100-seed weight, seed yield and growth characteristics (stem length, leaf area at each stage, and dry weight of shoot) and after measuring they were compared the relationships with seed yield and yield components and seed yield and growth characteristics. Seed yield of soybean was affected by cultivars and planting density. Seed yield was higher in upland than paddy field due to the higher planting density in upland field. The upland soybeans generally had lower 100-seed weight than that of paddy field. Seed yield of soybean in a paddy field was greatest in Taekwangkong and followed by Daewonkong and Hwangkeumkong. The harvest index of taekwangkong and Hwanggumkong was higher in upland than paddy field, however, it was higher in paddy field than upland in Daewonkong. Seed yield was greatest in Daewonkong in both experimental fields. The greatest stem length was observed in taekwangkong and Hwanggumkong (R6) in late growth stage in paddy field. Dry weight of shoot and pod, pod number, stem length, and stem diameter were higher grown in paddy field than grown in upland. Crop growth rate (CGR) of cultivars was higher in paddy field after 8 WAS(weeks after sowing) and it was greatest at 13 WAS in Daewonkong among the cultivars. In upland field, CGR was greatest in Taekwangkong and then followed by Daewonkong and Hwanggumkong during 12 and 15 WAS. There was no significant relationships between 100-seed weight and seed yield in both experimental fields. A significant positive relationship was observed between seed number and seed yield. The correlation coefficients between leaf area and shoot dry weight were about 0.8 during the whole growth stage except 5 WAS and 4-5 WAS in paddy field and upland, respectively. This experiment was done just one year and drained paddy field condition was not satisfied drained condition successfully at 7th leaf age of soybean by the heavy rain, so we suggest that the excessive soil water reduced seed yield in paddy field and the weather condition should be considered for utilizing of these results.

Genotypic Variation in Flowering and Maturing Periods and Their Relations with Plant Yield and Yield Components in Soybean

Ngon Trong Truong,Kyujung Van,Moon-Young Kim,Suk-Ha Lee 韓國作物學會 2006 Korean journal of crop science Vol.51 No.2

Improvement of crop yield can be achieved through understanding genetic variation in reproductive characters and its impact on yield components. The present study was performed to evaluate genetic diversity for reproductive growth characters in exotic germplasm resources and to determine the relationships between developmental and growth periods with yield and yield components in soybean cultivar groups. For phenotypic evaluation such as reproductive and agronomic traits, a total of 80 indigenous and exotic soybean cultivars collected from four different geographical regions (China, Japan, Korea, and Vietnam) were grown from May to November of 2003 at the Seoul National University Farm, Suwon, Korea (127~circ02 longitude, 37~circ26 latitude). Most of all the characters exhibited wide range of phenotypic variation, of which pod number, seed number, and plant yield showed greater range as compared to other characters. Korean cultivar groups showed greater diversity than the other cultivar groups in seven characters. Correlation analysis showed that days to flowering (DTF) and days to maturity (DTM) had close association with agronomic traits as well as yield and yield components. Both DTF and DTM had positive correlation with the other characters except one hundred seed weight. Stepwise multiple linear regression revealed that seed and pod number were identified as being significant for plant yield. The results in this study indicated wide variation in agronomic traits including DTF and DTM, suggesting the valuable genetic resources in a soybean breeding program.

Genotypic Variation in Flowering and Maturing Periods and Their Relations with Plant Yield and Yield Components in Soybean

Truong Ngon Trong,Van Kyu-Jung,Kim Moon-Young,Lee Suk-Ha The Korean Society of Crop Science 2006 Korean journal of crop science Vol.51 No.2

Improvement of crop yield can be achieved through understanding genetic variation in reproductive characters and its impact on yield components. The present study was performed to evaluate genetic diversity for reproductive growth characters in exotic germplasm resources and to determine the relationships between developmental and growth periods with yield and yield components in soybean cultivar groups. For phenotypic evaluation such as reproductive and agronomic traits, a total of 80 indigenous and exotic soybean cultivars collected from four different geographical regions (China, Japan, Korea, and Vietnam) were grown from May to November of 2003 at the Seoul National University Farm, Suwon, Korea ($127^{\circ}02'E$ longitude, $37^{\circ}26'N$ latitude). Most of all the characters exhibited wide range of phenotypic variation, of which pod number, seed number, and plant yield showed greater range as compared to other characters. Korean cultivar groups showed greater diversity than the other cultivar groups in seven characters. Correlation analysis showed that days to flowering (DTF) and days to maturity (DTM) had close association with agronomic traits as well as yield and yield components. Both DTF and DTM had positive correlation with the other characters except one hundred seed weight. Stepwise multiple linear regression revealed that seed and pod number were identified as being significant for plant yield. The results in this study indicated wide variation in agronomic traits including DTF and DTM, suggesting the valuable genetic resources in a soybean breeding program.

Genetic variability and heritability of agronomic traits in a wheat collection used in southern Brazil

Fernandes Rebeca Catanio,Busanello Carlos,Viana Vívian Ebeling,Venske Eduardo,de Oliveira Victoria Freitas,Lopes Jennifer Luz,da Maia Luciano Carlos,Costa de Oliveira Antonio,Pegoraro Camila 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.3

Wheat is a staple food for a large part of the world's population and faces a continuous demand for increased productivity. The presence of genetic variability allows the success in developing cultivars with higher yield. The understanding of the genetic variability available is crucial for their efective use in breeding programs. Inheritance of wheat yield components is complex, due to polygenic control and the strong infuence of the environment. Therefore, an accurate heritability estimation can accelerate the selection gains towards increasing wheat yield. Thus, this study aimed to characterize agronomic traits related to yield in a collection of 99 wheat accessions used in Brazil. In addition, the heritability of these traits was estimated. The studied accessions showed variability for yield, which can be explained by the presence of variability in most yield components. Cluster analysis showed that there is variability in wheat genotypes, however, the introduction of new sources of variability in crossing blocks or the induction of mutations is suggested. The broad-sense heritability for grain yield was considered high, as well as for most of the studied agronomic traits, suggesting that it is possible to obtain genetic gain with selection in this environment. However, for greater accuracy, genetic gain values should be estimated and considered when designing selection strategies. Hectoliter weight showed low heritability, demonstrating the complexity of selection for this trait. In summary, this study demonstrates the presence of genetic variability and high heritability for agronomic traits, enabling genetic gain in breeding programs using these wheat accessions.

온도 상승 조건이 벼의 수량 및 수량구성요소에 미치는 영향

이규종 ( Kyu Jong Lee ),뉴안덕 ( Duc Nhuan Nguyen ),최덕환 ( Doug Hwan Choi ),반호영 ( Ho Young Ban ),이변우 ( Byun Woo Lee ) 한국농림기상학회 2015 한국농림기상학회지 Vol.17 No.2

기후변화로 야기되는 미래의 고온 환경은 벼의 생산성을 저하시킬 것으로 예측되고 있다. 본 연구에서는 기후변화에 따른 국내 벼 생산성의 신뢰성 있는 영향평가 기초자료를 확보하기 위해 고온 환경에서의 벼의 수량과 수량 구성 요소의 반응을 조사하고 분석하였다. 실험은 1/5000a 와그너 포트를 이용하여 2008년과 2009년에 걸쳐 서울대학교 부속실험농장(37o16``N, 128o59``E)의 온도조절 플라스틱 하우스에서 실시되었다. 2008년에는 자포니카계의 화성벼를 공시품종으로 이용하였으며, 시비수준을 120kg N ha-1와 180kg N ha-1 로 하였다. 온도처리는 대기온도, 대기온도 대비 +1.5oC, +3.0oC의 세 수준으로 하였다. 2009년에는 화성벼와 통일계의 다산벼를 공시품종으로 하여 120kg N ha-1 수준으로 시비하였다. 온도처리는 대기온도, 대기온도 대비 +1.5oC, +3.0oC 및 +5.0oC 수준으로 처리하였다. 수량 및 수량구성요소의 온도처리에 따른 영향은 품종별로 상이한 반응을 보였다. 이삭수와 이삭당 영화수는 두 품종 모두 온도처리의 영향을 받지 않았으나, 천립중과 등숙률에 대해 화성벼는 5.0℃, 다산벼는 1.5oC 이상의 온도처리에서 유의하게 감소하였다. 포트당 수량은 화성벼의 경우 5.0oC, 다산벼는 3.0oC 및 5.0oC 온도처리에서 유의한 감소를 나타냈다. 등숙 기간 동안의 평균기온에 대한 천립중과 등숙률 반응 또한 품종별로 다르게 나타났다. 다산벼의 경우 23oC이상의 평균 온도에 대해 등숙률과 천립중이 급격히 감소한데 반해, 화성벼는 23oC부터 27oC 범위에 대해 등숙률과 천립중의 변화가 크지 않았다. 기후변화에 의한 지속적인 기온상승이 예상되는 가운데 온도상승에 따른 등숙률과 천립중의 감소는 미래 기후 환경에서의 벼의 수량 감소를 야기하는 주요 원인으로 예측된다. 다만, 상승된 기온에 대한 벼의 반응은 품종별로 상이하기 때문에 고온에 둔감한 품종의 도입 또는 그러한 특성을 지닌 품종의 육종을 통해 기후변화에 따른 수량 감소의 위험을 낮출 수 있을 것이다. High temperature stress would affect rice production in the future as heat wave is expected to occur frequently under climate change conditions. The objective of this study was to obtain rudimentary information to assess the impact of heat stress on rice yield and its yield component in Korea. Two rice cultivars “Hwaseongbyeo” (Japonica) and “Dasanbyeo” (Tongil-type) were grown at different nitrogen fertilization levels in two seasons. These cultivars were grown in 1/5000a Wagner pot placed within four plastic houses where temperature was controlled at ambient, ambient+1.5oC, ambient+3oC and ambient+5oC throughout the rice growing season in Suwon (37o16``N, 128o59``E), Korea. The degree of temperature change affected grain yield whereas the level of nitrogen had little impact on grain yield. The number of panicle per pot and spikelet per panicle were not significantly different among temperature treatments in both cultivars tested. In contrast, 1000-grain weight and ripened grain ratio were decreased significantly under the treatments raising the air temperature to the level of 5.0oC and 1.5oC above the ambient air temperature in Dasanbyeo and Hwaseongbyeo, respectively. Reduction of 1000-grain weight and ripened grain ratio under the temperature treatments of 3.0oC and 5.0oC above the ambient air temperature resulted in significantly less grain yield for Dasanbyeo and Hwaseongbyeo, respectively. The greater sensitivity of grain yield to temperature increase in Dasanbyeo was attributable to the sharp decrease of 1000-grain weight and ripened grain ratio with the temperature rise above 23oC during ripening period. On the other hand, Hwaseongbyeo had little variation of them in the temperature range of 23-27oC. These results suggested that grain yield would decrease under future climate conditions due to grain weight decreased by shorter grain filling period as well as the ripened grain ratio reduced by spikelet sterility and early abortion of rice kernel development. Thus, it would be essential to use cultivars tolerant to heat stress for climate change adaptation, which merits further studies for developing varieties that have traits to avoid spikelet sterility and early abortion of rice kernel, e.g., early morning flowering, under heat wave.

Assessment of Genetic Diversity for Grain Yield and Yield Component Traits in Some Genotypes of Rice (Oryza Sativa L.)

Maxwell Darko Asante,Kossi Lorimpo Adjah,Ebenezer Annan-Afful 한국작물학회 2019 Journal of crop science and biotechnology Vol.22 No.2

Even though there are abundant rice genetic resources, only a fraction is used in breeding programs leading to a narrow genetic base for improved varieties. Increasing the use of available rice germplasm could lead to the development of varieties that are superior in yield and other important agronomic traits. One hundred rice genotypes were used to estimate the genetic variability, heritability, clustering, trait association, and principal components for eight yield and yield-related traits. The experiment was conducted in a 10x10 lattice design in three replications under field conditions. The GCV ranged from 4.3% for panicle length to 17.9% for grain yield. Grain yield (GY) had the highest PCV (37.3%), while kernel length had the lowest PCV (7.0%). High heritabilities and moderate genetic advances were observed for days to flowering (DF), plant height (PH), kernel length (KL), and kernel length-to-width ratio (KLW). In general, the magnitudes of genotypic correlations were higher than phenotypic correlations. Grain yield showed a positive association with DF and PL at both genotypic and phenotypic levels, and with PH and KW at the genotypic level only. The genotypes clustered into three groups and the first three principal components explained about 70.3% of the total variation with KLW, KL, DF, and GY being the principal discriminatory characters. There was adequate genetic variability in the germplasm to support breeding for improved grain yield and indirect selection for high yield can be done in early generations using DF, PH, and PL.

온도 조건에 따른 벼 수량 및 수량 관련 요소 반응의 품종간 차이

이규종 ( Kyu Jong Lee ),김동진 ( Dong Jin Kim ),반호영 ( Ho Young Ban ),이변우 ( Byun Woo Lee ) 한국농림기상학회 2015 한국농림기상학회지 Vol.17 No.4

생태형이 다른 8개 벼 품종을 대상으로 포트 실험을 실시하여 대기온, 대기온 대비 +1.5oC, +3.0oC, +5.0oC 온도 조건에서의 수량 및 수량 관련 요소의 반응을 분석하였다. 이삭수를 제외한 수량 및 수량 관련 요소들의 온도 상승 조건에 대한 반응은 생태형 및 품종에 따라 유의한 차이가 있음을 확인하였다. 온도가 높아짐에 따라 영화수는 증감의 경향이 명확하진 않았으나 대체로 대기온보다는 증가하였고, 천립중과 등숙률은 감소하는 경향을 나타냈다. 수량 관련 요소중 온도 상승에 가장 민감한 반응을 보인 요소는 등숙률이었으며, 가장 둔감한 요소는 천립중이었다. 등숙률의 하락과 맞물려 수량은 고온 조건일수록 낮아졌으나, 영화수 증가 영향으로 수량의 저하 정도는 등숙률의 그것보다 크지 않았다. 생태형 및 품종별 반응은 조생종의 오대벼와 운광벼가 온도 조건에 가장 민감하였으며, 중만생종 품종들의 반응은 대체로 둔감한 것으로 나타났다. 출수 후 온도의 영향 정도를 분석한 결과 천립중, 등숙률, 완전발육미율, 수량은 출수 후 20일간의 평균기온과 가장 높은 상관관계를 보였으며, 온도가 높아질수록 부정적인 영향을 미치는 것으로 나타났다. 상관분석 결과를 바탕으로 로지스틱 함수를 이용하여 품종 간 온도 반응 특성의 차이를 분석하였다. 수량의 경우 품종 간 온도 반응 특성이 다르지 않은 것으로 나타나, 품종에 상관없이 온도 반응에 대한 추정이 가능할 것으로 사료된다. 이와 달리 천립중, 등숙률, 완전발육미율, 임실률의 경우 품종별로 온도 반응 특성이 달랐으므로, 각 품종에 맞는 온도 반응 추정식을 이용해야 할 것이다. An experiment in a controlled environment was conducted to evaluate the genotypic differences of grain yield and yield-related elements of rice under elevated air temperature. Eight rice genotypes included in three maturing group (early, medium, and medium-late maturing group) were grown with 1/5,000 a Wagner pots at four plastic houses that were controlled to the temperature regimes of ambient temperature (AT), AT+1.5oC, AT+3.0oC, and AT+5.0oC throughout the rice growing season in 2011. Ripened grain ratio and 1000 grain weight showed the most susceptible and tolerant responses to elevated air temperature, respectively. The grain yield reduction was attributable to the sharp decrease of ripened grain ratio. Grain yield was significantly decreased above the treatment of AT+1.5oC and AT+3.0oC in early maturing group and the others, respectively. Highly correlation to average temperature from heading to 20 days was revealed in yield (r = -0.69), ripened grain ratio (r = -82), fully-filled grain (r = -70), and 1000 grain weight (r = -0.31). The responses of yield and yieldrelated elements except number of spikelets and panicle to elevated air temperature were fitted to a logistic function. The parameters of logistic function for each elements except grain yield could not be applied to the other varieties. In conclusion, yield and yield-related elements responded differentially to elevated air temperature according to maturity groups and rice varieties. Ongoing global warming is expected to decrease the grain yield not only by decreasing the grain weight but also decreasing the ripened grain ratio in the future. However, the yield reduction would be mitigated by adopting and/or breeding the less sensitive varieties to high temperature.

서로 다른 생태형의 벼 품종에 대한 수량 및 수량관련 형질의 유전분석

곽태순 한국국제농업개발학회 2002 韓國國際農業開發學會誌 Vol.14 No.3

생태형이 서로 다른 몇 가지 벼 품종에 대하여 수량, 수량구성요소, 수확지수 및 생산성계수 등의 차이를 비교 검토하고 각 형질들의 유전력과 유전상관을 파악하여 수량형질의 벼 품종 개량방향을 파악코자 수행한 결과를 요약하면 아래와 같다. 1. 분산분석결과 정조수량, 고중 및 수당영화수는 분산이 매우 큰 형질로 선발의 효과가 기대 되었고 유전력도 90% 이상의 높은 유전력을 보여 개량 가능성이 매우 큰 형질로 판단된다. 2. 등숙비율과 천립중은 42%이하의 낮은 유전력을 보여 환경의 영향이 크게 관여한다는 것을 알 수 있었다. 3. 조사된 모든 형질에서 유전상관의 값이 표현형 상관의 값보다 높게 나타났다. 4. 등숙비율은 환경상관의 값이 유전상관 및 표현형상관 값보다 크게 나타나 환경의 영향을 크게받는 형질인 것으로 나타났다. 5. 정조수량은 수수, 수당영화수, 수확지수, 생산성계수와 고도의 유의한 정의 유전상관 및 표현형상관을 보였고 특히 수확지수와 생산성계수는 환경상관까지도 유의한 정의 상관을 보였다. In order to get the basic informations regarding the rice breeding materials which are suitable at the whole parts in Korea, eighteen varieties which composed by 4 Indica cultivars, 2 upland rice varieties, 2 waxy Japonica cultivars, 2 direct seeding cultivars, 2 coloured rice cultivars, 5 native rice varieties and standard variety were grown at the Sangji University from May 1998 to October 1998. Yield and yield component's elements, harvest index and productivity score were investigated at the maturity stage and post harvest. Grain yield, straw yield and number of spikelets per panicle which had a great variance by the variance analysis were anticipated for the impact of selection and the possibility of character improving, and these characters had a great heritability, more than 90%. Ripened grain ratio and 1000 grain weight which had a low heritability, less than 42%, affected so much by the environmental elements such as temperature and solar radiation etc. The genetic correlation coefficient showed greater than phenotypic correlation coefficient in all investigated characters. The ripened grain ratio which had great environmental correlation than genetic and phenotypic correlation much effected by the environmental elements. Grain yield showed a great positive significant genetic and phenotypic correlations with the number of panicles per hill, number of spikelets per panicle, harvest index and productivity score. In case of harvest index and productivit score at the environmental correlation coefficients showed highly positive correlation with grain yield.