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Inheritance of cell membrane stability under PEG and atmospheric induced osmotic stress in barely genotypes

Maryam Fathollahzadeh Ardabili, Hossein Shahbazi

Department of Agronomy and Plant Breeding, Ardabil Branch, Islamic Azad University, Ardabil, Iran

Key words: Cell membrane stability, Diallel, drought, heritability.


BN-KL046_0922AF_P_20150922222035To evaluate the inheritance of cell membrane stability of barely, the F1 seeds of a 6×6 half diallel, along with their parents were grown in greenhouse in randomized complete block design with three replications. After flowering, leaf blades were used for evaluation of membrane injury Index under atmospheric and PEG Induced osmotic stress. The experiment was carried out at Islamic Azad University, Ardabil, Iran in 2014. Results showed that additive-dominant model was adequate for determining the inheritance of the traits. In spite of high broad sense heritability of the traits, they had relatively low narrow sense heritability. Both of the traits governed with over dominance, while the magnitude of average degree of dominance was greater in Membrane Injury index PEG. Higher frequency of dominant alleles in the parents was also demonstrated in both of the traits. Results showed that there was not a clear relation between dominance and favorability of Traits. The significant GCA mean square suggests that genetic gain is achievable through selection over the segregant populations. However, due to high average degree of dominance, selecting for traits under study must be done in advanced generations of barely breeding programs. Results of combining ability analysis also showed that parent number 1,3and 4 had good additive genes for membrane injury Index.

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