Genetic and Phenotypic Correlations Between the Yield and Its Components For Three Genotypes of Broad Bean, As Affected By Humic Acid and Iron and Zinc Elements and It's Partitioning into Direct and Indirect Effects
European Journal of Molecular & Clinical Medicine,
2020, Volume 7, Issue 11, Pages 297-307
AbstractThree genotypes of broad bean (local, Spanish, LOZ DE OTO and Italian FAVA DE ORTO) were planted at the Research Station of the Faculty of Agriculture, University of Kirkuk in Al-Sayada through the winter agricultural season (2018-2019), at three levels of humic acid (0, 12 and 24 mg.L-1 ) and four levels of iron and zinc (0, 80 Fe, 60 Zn, and 60 Zn + 80 Fe) mg.L-1 ), carried out as factorial experiment using randomized complete block design with three replications, to evaluate the traits: dry seed yield per plant and some of its components from other traits (plant height, number of branches per plant, number of nodes on the main stem, number of pods per plant, pod length, 100 seeds weight, number of seeds per pod), and analysis of the genetic and phenotypic path coefficient between the yield and its components. The results showed that the Italian genotype was significantly surpassed others for most number of traits, including the dry seed yield per plant, followed by the local genotype. It turns out that 20.25, 9.5, 12, 10 and 13.5 mg.L-1 of humic acid gave the highest means of plant height, number of nodes on the main stem, number of pods per plant, 100 seeds weight, and dry seeds yield per plant respectively, and the treatment Zn 60 mg.L-1 gave the highest yield of dry seeds per plant with a non-significant difference from the control treatment. The results of path coefficient analysis showed that the highest direct and indirect effects through other traits genetically were for the traits 100 seeds weight, and pod length, but phenotypically, the direct effects were positive and high for five traits: number of branches per plant, number of nodes, number of pods per plant, pod length and 100 seeds weight, and the indirect effects of the traits number of pods per plant, 100 seeds weight and pod length through other traits being the best, therefore, these three traits can be relied upon as a selection criteria in breeding programs for higher dry seed yield.
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