Morphological characterization and genetic analysis in bread wheat germplasm: A combined study of heritability, genetic variance, genetic divergence and association of characters

  1. Gerema1*, D. Lule2, F. Lemessa4, T. Mekonnen3

1Bako Agriculture Research Center, Oromia, Ethiopia

2Oromia Agriculture Research Institute, Finfinne, Ethiopia

3Institute of Biotechnology, Addiss Ababa University, Ethiopia

4Department of Horticulture and plant Science, Jimma University, Jimma, Ethiopia

(Manuscript received 20 May 2020; accepted for publication 5 November 2020)

Abstract. The present study was conducted to assess the nature and magnitude of genetic variability and traits association of bread wheat genotypes for yield and related traits. A total of 180 genotypes were evaluated in alpha lattice design with three replications in 2017/18 cropping season. Data for 10 quantitative traits were collected and subjected to analysis of variance. The result from the analysis of variance revealed highly significant variability observed among genotypes for all traits studied. Phenotypic coefficient of variation (PCV) is superior over genotypic coefficient of variation (GCV) for most traits but narrow variations were found between PCV and GCV for most of the traits. Heritability in broad sense and genetic advance as percent of the mean (GA%) were relatively higher for Kernels per spike and grain filling period. Grain yield showed positive and highly significant (p≤0.01) association with number of tillers, kernel per spike and plant height both on genotypic and phenotypic levels.The path coefficient analysis showed that spike length, plant height and kernels per spike had positive direct effect on grain yield on both genotypic and phenotypic levels. Divergence analysis (D2) grouped the total test germplasm into 10 clusters. Among those, clusters IV and IX showed the highest genetic distance and thus the possibility to develop segregating populations upon the crossing of widely related genotypes in those clusters. The results could help researches to utilize the most promising wheat genotypes of this study in future breeding programmes for enhancing desirable traits.

Correlation between grain yield and yield components in winter barley varieties

N. Markova Ruzdik1*, D.Valcheva2, D.Vulchev2, Lj. Mihajlov1, I. Karov1, V. Ilieva1

1Faculty of Agriculture, “Goce Delchev” University, 2000 Stip, Macedonia 2Institute of Agriculture, 8400 Karnobat, Bulgaria

Abstract. The objective of this study was to determine the correlation between yield and its components and their direct and indirect effects on grain yield in two-row winter barley varieties. The experimental work was conducted during the period of 2012-2014 on the research fields of the Faculty of Agriculture, in two different areas in the Republic of Macedonia, Ovche Pole and Strumica. As far as material is concerned, 21 genotypes were used with Macedonian, Serbian, Croatian and Bulgarian origin. Significant and positive coefficient of correlations were obtained between grain yield and number of spike per m2, number of productive tillers per plant and grain weight per plant, number of grain per spike and grain weight per spike, grain weight per spike and 1000 grains weight in both localities. The highest direct effect to grain yield was obtained by number of spikes per m2 in both localities. Therefore, this trait can be used as a criterion in breeding to improve the yield of barley varieties.


Correlations between grain yield and yield related traits in barley mutant lines

B. Dyulgerova

Abstract. The present study was undertaken with the objective to determine the association between yield and its component characters and their direct and indirect effects on grain yield in winter barley (Hordeum vulgare L.) mutant lines. The study was conducted at the Institute of Agriculture, Karnobat, during the period 2009–2011 and included 19 lines, developed by mutant treatment with sodium azide of cultivar Veslets. Phenotypic correlations of grain yield were highly significant and positive with number of grains in spike, weight of grains in a spike and weight of grains in a plant. The maximum direct contribution to grain yield was made by weight of grains in a plant and number of grains in spike. Therefore, these traits can be used as selection criteria to high-yielding winter feed barley mutants.