ESTMATING PHENOTYPIC, GENOTYPIC AND ENVIRONMENT PATH COEFFICIENTS IN WHEAT (TRITICUM AESTIVUM L.) GENOTYPES | ||
| Fayoum Journal of Agricultural Research and Development | ||
| Article 27, Volume 23, Issue 1, January 2009, Pages 76-86 PDF (412.87 K) | ||
| Document Type: Research articles. | ||
| DOI: 10.21608/fjard.2009.197038 | ||
| Authors | ||
| Ahmed, A. M. Atia1; S.K.A. Ismail2 | ||
| 1Agricultural Economics Research Institute-Agric. Res. Center- Giza- Egypt. | ||
| 2Agron. Dept. Fac. Agric., Fayoum Univ. Egypt. | ||
| Abstract | ||
| Two field experiments were carried out during two successive seasons on six wheat genotypes at the experimental farm, Faculty of Agriculture, ElFayoum Univ. In 2005/2006 season, the six parental genotypes were planted and all possible crosses excluding reciprocals were hand made to produce 15 F1 hybrids. In the second season (2006/2007), the parents and hybrids were planted using the randomized complete block design with five replications. The correlation coefficients and path analysis were calculated between grain yield and yield components of the 21 wheat genotypes. The tested genotypes exhibited significant differences due to the presence of sufficient genetic variability, and standard error values were in the range of 0.5 for spike length to 2.54 for number of grains/spike. Consequently the latter trait showed the highest values of phenotypic, genotypic and environmental variances followed by those of grain yield/ plant. Heritability and genetic advance values were high for days to heading, days to maturity, number of grains /spike and grain yield /plant. Grain yield /plant was positively correlated phenotypically and genotypically with days to heading and days to maturity and negatively with number of grains /spike. Phenotypic path coefficient revealed that the direct effect of days to maturity on grain yield was the highest (0.57) with relative importance of 18.8% followed by those of spike length. Concerning genotypic path coefficient, both traits, respectively, ranked as the first and second traits affecting grain yield /plant. The indirect phenotypic effects on grain yield exhibited by days to heading, days to maturity, plant height and spike length were 0.39, -0.11, 0.22 and 0.028, respectively. The relative importance of indirect genotypic effects on grain yield showed by plant height, days to maturity and spike length were 27.6, 21.1, and 11.8, respectively. | ||
| Keywords | ||
| ANOVA; ANCOVA; Path analysis; Wheat | ||
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