Estimation of Genetic Parameters of Different Wheat Genotype Traits in Chitwan, Nepal

Abstract

This research was carried out to estimate the genetic parameters of fifty wheat genotypes received from the Agriculture Botany Division, Nepal Agriculture Research Council (NARC), Khumaltar, Lalitpur, in the winter season of 2014/2015 at Agriculture and Forestry University (AFU), Chitwan, Nepal. The experiment was performed in an alpha lattice design with two replications in five blocks in each replication and ten plots in each block. The analysis of variance showed highly significant differences among the genotypes for all the studied traits except spike length. This implies that, except for spike length, all other traits exhibited genetic variability. The phenotypic coefficient of variation (PCV) was generally higher than the genotypic coefficient of variation (GCV) for all characters. The difference between PCV and GCV was large in spike length followed by grain weight per spike, the number of grains per spike, grain yield, thousand-grain weight, and harvest index indicating that these traits are affected by the environment as well. Moderate to high heritability associated with a high genetic gain was observed for days to flag leaf appearance, panicle length, thousand-grain weight, grain yield, and harvest index indicating the involvement of additive gene action. Grain weight per spike, number of grains per spike, thousand-grain weight, biological yield, and harvest index were significantly correlated with grain yield indicating their important contribution to grain yield. WK 2525, WK 2437, and WK 2506 were three promising genotypes in terms of grain yield.

Assessing the phenotypic variation, heritability and genetic advance in bread wheat (Triticum aestivum L.) candidate lines grown under rainfed semi-arid region of Algeria

“…Among the yield attributing traits, the PCV values were, in general, greater than the GCV, which reflects the influence of the environment in the expression of these evaluated characteristics. These findings were in agreement with those of Din et al (2018) and Regmi et al (2021).…”

“…GAM was found just intermediate in the FLA (15.22) and low in the remaining traits. The obtained results are consistent with those of Seyoum and Sisay (2021) for PH, Hossain et al (2021) for CT, Fellahi et al (2019) for heading date and FLA, Din et al (2018) for TKW, and Regmi et al (2021) for the number of fertile tillers and GY.…”

“…According to Regmi et al (2021), PCV and GCV only indicate the amount of total variability available in an assessed trait and do not split it into heritable (genotypic variance) and non-heritable (environmental variance) fractions. Thus, the heritability parameter is largely used to separate genetic and environmental components of this phenotypic variation.…”

Assessment of selected elite lines from CIMMYT’s semi-arid and collaborative wheat yield trials in advanced stage of testing under the agro climatic condition of Kohat, Khyber Pakhtunkhwa

“…The analysis result confirmed the presence of significant (P<0.1) differences among the experimental material having the genetic variance of 23.9 and residual variance of 8.8 (Table 2). Results of [19,20] are in alliance with our study. Means for plant height of all wheat genotypes ranged from 91.5 (Pirsabak 15) to 113.5 (EBWL-41) (Fig.…”

“…Heritability was high (0.84) for plant height (Table 2) with response to selection of 8.1cm (Table 3). High heritability estimate was also stated by [20,21]. Negative selection differential (-15.88 cm) was estimated for said trait (Table 3) and it is favorable for taller genotypes as there is chances that in next breeding cycle the height will reduce to desirable range.…”