Genetic parameters and agronomic characterization of elite barley accessions under irrigation in the Cerrado

Abstract

There is a demand for barley cultivars that are suitable for the malt industry as well as genotypes that are stable and better adapted for irrigation in the Cerrado. This study aimed to estimate the genetic parameters by assessing 69 barley genotypes from different countries, from 2012 to 2014, under irrigation in the Cerrado. Six agronomic characteristics were assessed: grain yield, plumpness kernel, thousand seeds weight, plant height, degree of plant lodging and days to heading. Analysis of variance, cluster test and phenotypic, genotypic and environmental correlations were performed. Significant effects were observed for genotypes, years and the G x E interaction. High values of broad-sense heritability (> 86%) were found for all the characteristics, which enabled direct selection. The Colombian accession MCU363PI402112 stood out for its agronomic characteristics. Genotype selection based on the phenotypic evaluations was possible due to their good experimental accuracy and precision. Precocious genotypes with high grain yields and homogeneous grain sizes were selected. Due to the environmental influence on the grain yield, additional studies concerning the components of yield in this environment are necessary to facilitate the selection of more productive genotypes.

Variability, Correlation, and Path Coefficient Analysis of Grain Yield and Yield-Related Traits of Facultative Barley Accessions Grown Under Rainfed Conditions

“…Very high heritability was observed for plant height (90.52%) and spike length (91.06%). Low values of broad-sense heritability for barley grain yield were also found by Ahmadi et al (2016) while other authors reported from medium (Sayd et al 2019) to high (Al-Tabbal et al, 2012) heritability estimates. The mean values of studied traits of facultative barley accessions are presented in Table 4.…”

Genetic parameters and gains with the selection of fig tree genotypes

“…Traits related to growth and production, despite being affected by the environment, show wide genetic variability, which allows for achieving greater selection gains by selecting genotypes with a higher growth capacity in tropical climates and lower I1, resulting in longer harvest and better yield at the end of the productive cycle (Sayd, Amabile, Faleiro, Coelho, & Montalvão, 2019). In this context, MSA is a significant trait for the selection of figs trees in the initial stage of production, since more vigorous plants tend to achieve greater production and longer harvest; however, the evaluation of productivity in the initial period may neglect the potential of genotypes with a young appearance but prolonged harvest (Pinheiro et al, 2013).…”

“…In this context, MSA is a significant trait for the selection of figs trees in the initial stage of production, since more vigorous plants tend to achieve greater production and longer harvest; however, the evaluation of productivity in the initial period may neglect the potential of genotypes with a young appearance but prolonged harvest (Pinheiro et al, 2013). Moderate-tohigh ℎ 2 values and genetic variation are associated with high genetic variability and selective accuracy as well as the possibility of the successful selection of accessions with agronomic traits of interest (Sayd et al, 2019).…”

Elucidation of gene action and combining ability for productive tillering in spring barley

“…In the other words, it is a measure of the degree to which a phenotype is genetically determined and can be changed by selection. In the studies by various authors in barley the coefficient of heritability in the broad sense varied from 0.22 for peduncle length to 0.57 for thousand kernel weight (Dinsa et al, 2018), from 0.50 for grain yield to 0.98 for kernel number per spike and thousand kernel weight (Marzougui & Chargui, 2018;Ali & Sayed, 2019;Sayd et al, 2019), from 0.24 for grain yield to 0.96 for kernel number for spike (Ahmadi et al, 2016). Several reports showed that for productive tillering in barley the coefficient of heritability in a broad sense varied from low (0.22) (Matin et al, 2019) to high (0.70-0.89) (Kumar et al, 2013;Yadav et al, 2015), and the coefficient of heritability in a narrow sense varied from 0.14 to 0.42 (Malik et al, 2018;Habouh, 2019).…”