Genetic Path Analysis and Correlation Studies of Yield and Its Components of Some Bread Wheat Varieties

Abstract

The research was applied in one of the farmers’ fields in Al-Khalidiyah / Anbar Governorate to determine the most appropriate traits to improve the yield of wheat grains during the two seasons 2017-2018 and 2018-2019. The experiment was carried out according to the randomized complete block design with three replicates, with aim of studying the path coefficient of the yield and its components for seven varieties of bread wheat (IPA 99, Buhooth 85, Iraq, Abu Ghraib 3, Tamoz 2, Sham 6, and Al-Rasheed). Most of the traits showed a significant positive correlation with grain yield. Also, the results of the analysis of the genetic path coefficient indicated that the indirect effect of the number of total tillers on the individual plant yield through the number of productive tillers, was 0.729 and 0.805 for the two seasons respectively, and very close to the direct effect of the number of productive tillers in the individual plant yield 0.887, 0.920. Also, the direct effect of the weight of 1000 grains on the yield of the plant was positive 0.514, 0.707, for the two seasons respectively, and its negative indirect effect of the number of productive tillers. Likewise, the direct effect was positive for the harvest index on individual plant yield and its indirect positive effect with the number of productive tillers. The study recommends focusing on breeding and improvement programs on the characteristics of the number of productive tillers, the weight of 1000 grains, and the harvest index is the best selection index to improve the cereal yield due to its significant correlation and its direct and high impact on the yield.

Genetic and Molecular Analysis of the Genotypes of Bread Wheat and its Single Cross Hybrids

“…The number of unique bundles is (3) bundles, which is a distinguishing feature for the varieties, and their appearance is an indication of the occurrence of mutations and new unions that produce hybrids in the plant gene, the genes related to the dominant genetic variance were more important than the genes related to the additive genetic variance in controlling the inheritance of traits characterized by high dominance genetic variance (Table 7). This result is in agreement with the other findings [15,10,22,23].…”

Unveiling the Complexity of Yield Traits through Genetic Variability, Correlation, and Path Analysis across Diverse Bread Wheat [Triticum aestivum (L.) em. Thell] Germplasm

“…Harvest index has Significant negative correlations with Days to 50% flowering (-0.47504). Similar results were shown by Abdulhamed et al, [30]; Baye et al, [31]; Poudel et al, [32].…”

RAPD Technique to Determine the Genetic Divergence of Barley Genotypes

“…Many morphological characteristics characterize barley cultivars. Knowing the association between genotype and phenotype, as well as their interplay, is a fundamental basis in plant breeding initiatives [2][3][4]. Isolating superior genotypes is critical to the success of breeding operations.…”