Estimation of Genetic variability and Correlation Coefficient for yield and its components and Root Length in Faba Bean Genotypes under Water Stress

Determine and improving drought tolerance genotype is a major goal of plant breeding to face climate change .The productivity of faba bean in Egypt is affected by abiotic stress especially drought stress .The present study aimed assessing sixty faba bean genotypes, consists of fifty four finish families selected from 180 lines based on it seed yield and six check Egyptian cultivars to estimates of genetic variability, heritability , genetic advance and phenotypic correlations coefficient of seed yield and components in faba bean genotypes under water stress .This assessment was carried out in field experiment under water regimes consisting of three systems (100%, 75% and 50% of field capacity), through two locations (Ismailia , North Sinai governorates) during tow successive growing seasons (2019\2020 and 2020\2021). The field experiments were laid out in split-plot with randomized complete block design with four replications, where the main plots were allocated to three watering levels (100%75%and 50% of field capacity), while the subplots were a located the genetic material (60 genotype of faba bean). The results cleared that the phenotypic coefficient of variation and Genotypic coefficient variation (GCV) were higher for number of branches/plants, number of pods/plants, number of seed/pods, seed yield/plot dry mater production, harvest index and water use efficiency. The obtained results are indicating greats for improvement of these  character by simple selection .The high  broad since heritability estimate, which recorded in tow season (2019-2020 and 2020-2021) for dray matter production ( 89.91 and 76.33 , respectively) , harvest index (86.08 and 81.81 , respectively) , seed index (79.69 and 84,o6 ), number of seed/pod (65,0 and 65.1 , respectively), water use efficiency (86.61 and 78.19  respectively) and root length (86.78 and 81.27, respectively) traits indicated less influence of environment on respective character. Hence, direct selection can be followed to improve faba bean genotypes for this trait is early maturing genotypes. In addition, the high heritability coupled with high genetic advance absolved indicated the most of studied trait were mainly governed by additive gene action and are greatly influence for direct selection for genetic improvement by pedigree selection methods of heritable trait. Positive and highly significant correlation was observed of study characters. The strong as so giving on of these characters can be give importance during selection to improve the yield potential of faba bean.