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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Correlation and Path Analysis of Palm Oil Yield Components in Oil Palm (Elaeis guineensis Jacq.)) ผู้เขียน: Sudanai Krualee, Sayan Sdoodee, Theera Eksomtramage, Vinich Sereeprasert สื่อสิ่งพิมพ์:pdf AbstractThis research aimed to evaluate the correlation coefficients, direct effects and indirect effects of agronomic characters on palm oil yield components for selection and improvement of next-generation oil palm populations. The seven crosses of oil palms aged 4 yr were investigated at three locations in southern Thailand. The experiment at each location was designed as a completely randomized design with five replications. Data on bunch yield, yield components and bunch components were collected from July 2009 to June 2010. Combined analysis was used to estimate the variance and covariance for the calculation of correlation coefficient and path coefficient values. The results showed that the bunch yield, single weight, fresh mesocarp per fruit and fruit per bunch had positive genotypic and phenotypic correlation coefficient values with regard to palm oil yield (1.03, 0.93, 1.70, 0.13 and 0.85, 0.56, 0.32, 0.34, respectively). The path analysis indicated that the bunch yield, fresh mesocarp per fruit and fruit per bunch had a positive direct effect on both the genotype and phenotype of palm oil yield (1.32, 0.68, 0.27 and 0.94, 0.20, 0.31, respectively). Although, the single weight had a positive correlation coefficient value for both genotype and phenotype, it had a negative direct genotypic and phenotypic effect on palm oil yield. Therefore, palm oil yield improvement should be considered especially in terms of the bunch yield, fresh mesocarp per fruit and fruit per bunch, because these characters had high, positive direct genotypic and phenotypic effects on palm oil yield. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Path Analysis of Yield Components in Rice) ผู้เขียน:M.K. Sinha, S.P. Banerjee สื่อสิ่งพิมพ์:pdf AbstractPath coefficient analysis was made on the data obtained from an experiment with 74 strains of rice. The path analysis revealed that the number of ear bearing tillers makes the largest positive and direct contribution to grain yield followed by number of grains per panicle. Length/breadth ratio and 100 grain weight have a direct influence on yield. Most of the auxiliary characters contribution to yield, plant height has not been found to channelize its indirect influence through two biggest direct contributors. Hence, inclusion of shorter height as objective of breeding would not in any way jeopardize the breeding for improvement of ear bearing tillers and number of grains per panicle. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Genetic Variation, Heritability and Path-Analysis in Ethiopian Finger Millet [Eleusine coracana (L.) Gaertn] Landraces) ผู้เขียน:Kebere Bezaweletaw,  ดร.ประภา ศรีพิจิตต์, รองศาสตราจารย์ , ดร.วาสนา วงษ์ใหญ่, รองศาสตราจารย์ , ดร.วิภา หงษ์ตระกูล, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractA total of 66 finger millet accessions constituted of 64 landraces and two standard varieties were evaluated for 15 morpho-agronomic characters in randomized complete block design with three replications at Aresi-Negele Research Sub-Center in Ethiopia during 2004 main cropping season. The objectives were to assess the variability and association of characters. The mean squares of genotypes were highly significant for all characters. Relatively, grain yield per plant exhibiting the highest range (4.87-21.21g) and days to maturity showed the lowest range (143-200 days) of 336 and 40% where maximal values were greater than the corresponding minimal values, respectively. For all characters, the phenotypic and genotypic coefficients of variations varied in the orders of 8.05-31.23% and 6.52- 24.21% in both cases for days to maturity and grain yield per plant, respectively. Heritability estimates ranged from 20% for grain-filling duration to 84% for days to heading. Values of expected genetic advance varied from 6.67-44.14% for grain-filling duration and finger width, respectively. Finger width and length exhibited high heritability coupled with high genetic advance. The strongest positive association was observed between culm thickness and leaf blade width while the strongest negative association was found between 1,000-grain weight and finger number. Grain yield per plant associated positively with productive tillers, 1,000-grain weight, the number of grains per spikelet and finger number and negatively associated with days to heading and maturity. The genotypic correlation and path-coefficient analysis showed 1,000-grain weight, finger number and productive tillers as a major contributor to grain yield per plant. Generally, the result revealed the existence of variability for the characters studied in finger millet landraces. Hence, this is a potential character of interest which could be used in the genetic improvement of finger millet through hybridization and/or selection. |
ที่มา:The National Graduate Conferenceหัวเรื่อง:การจำแนกวัตถุเคลื่อนที่ในบริเวณถูกบดบังโดยการวิเคราะห์เส้นทางการเคลื่อนที่ของส่วนประกอบ |
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ที่มา:สำนักงานคณะกรรมการการอุดมศึกษาหัวเรื่อง:Correlation and path analysis of yieldrelated traits in Bang Boet dura oil palm |
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