PJB-2022-450
GENETIC VARIABILITY AND CORRELATION AMONG YIELD RELATED TRAITS OF BARLEY GENOTYPES
Muhammad Junaid Khan
Abstract
This study was conducted to estimate heritability, selection response and genetic as well as phenotypic correlation among morpho-yield traits of 15 barley genotypes four (2-row) and 11 (6-row). The genotypes were evaluated in randomized complete block design with three replications at the Department of Plant Breeding and Genetics, University of Agriculture, Peshawar during the year 2020-21. Analysis showed highly significant (P ≤ 0.01) differences among barley genotypes for all the studied traits. Among 2-row barley, genotype BG4 was early to reach heading (106.7 days), maturity (154.7 days) and had highest tillers m-2 (373.3) and harvest index (39.0%), whereas BG2 had larger flag leaf area (12.1 cm2) and highest spike weight (2.3 g). Similarly, genotype BG1 produced longest spikes (11.3 cm) with more grains spike-1 (31.9), biological yield (6759.3 kg ha-1) and grain yield (2500.0 kg ha-1), whereas genotype BG3 had heavier 1000-grains (46.1 g). In contrast among 6-row barley, genotype BG10 was earlier in heading (105.7), maturity (154.0) and produced more tillers (436.3 m-2), biological yield (11234.6 kg ha-1) and grain yield (4395.1 kg ha-1). Likewise genotype BG12 had maximum grains spike-1 (75.3), whereas BG11 had higher 1000-grain weight (45.1 g) and harvest index (42.7%). Broad sense heritability and selection response for most of the traits were moderate to high in magnitude. High heritability with selection response was estimated for maturity (0.68 and 3.68 days), flag leaf area (0.63 and 3.50 cm2), spike length (0.73 and 1.10 cm), spike weight (0.73 and 0.85 g), grains spike-1 (0.91 and 20.72), and biological yield (0.66 and 2474.01 kg ha-1). Correlation analysis revealed that grain yield had significant positive genetic correlation with tillers m-2 (0.82**) and biological yield (0.97**), while significantly negative with heading (-0.74**), maturity (-0.71**) and 1000-grain weight (-0.62**). The phenotypic correlation of grain yield was significantly positive with tillers m-2 (0.74**) and biological yield (0.97**), while negative with heading (-0.60**), maturity (-0.67**) and 1000-grain weight (-0.52*). Hence, genotypes BG1, BG2 and BG4 were superior among 2-row barley, while BG6, BG8, BG10, BG11 and BG12 among 6-row barley genotypes in grain yield and maturity related traits and therefore, are recommended based on yield component and ultimate yield, for further testing in different agro-ecologies to establish their yield stability before possible release as barley cultivars for food, feed and forage purposes.
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