Korubin - Aleksoska, Ana and Miceska, Gordana and Dimitrieski, Miroslav (2014) GENETIC ANALYSIS OF NICOTINE INHERITANCE IN ONE-WAY DIALLEL CROSSES OF DIFFERENT TOBACCO TYPES. Science & Technologies, IV (6). pp. 6-9. ISSN 1314-4111

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Investigations are made with four parental genotypes, three of which are oriental (P-84, P 10-3/2 and YK-48), and one semi-oriental (FL) and their six one-way F1 diallels and the same number of F2, BC1(P1) and BC1(P2) crosses to estimate nicotine content in dry tobacco leaves. Crossings were made in 2010 and 2011 and the trial with parents and hybrids was set up in 2012 in the field of Tobacco Institute-Prilep, using randomized block design with four replicates. Usual cultural practices were applied during the growing season. The aim of investigation is to make genetic analysis of the inheritance of nicotine content, which would give reliable directions in selection of low-nicotine tobacco genotypes. The prevailing mode of inheritance in F1 is partial dominance, but positive and negative heterosis is also observed; in F2 intermediate mode is prevailing; in BC1 it varies, in backcrossing with P1 positive heterosis is present and in back-crossing with P2 negative heterosis. In F1 the additive (D) and dominant (H1 and H2) components of genetic variance are equal, while in the other generations the additive component has significantly higher magnitude than the dominant one. The interaction (F) value indicates that genes from the parent with lower nicotine content are predominant. The average degree of dominance shows complete dominance in F1 and partial dominance in F2 and BC1, which means rapid fixation of the trait in the successive selection. The ratio between dominant and recessive alleles indicates that recessive genes prevail. Degree of heritability (h2) confirms that nicotine is a highly heritable trait on which environmental factors have a limited effect.

Item Type: Article
Uncontrolled Keywords: tobacco (Nicotiana tabacum L.), nicotine, genetic analysis, mode of inheritance, components of genetic variance.
Subjects: Scientific Fields (Frascati) > Agricultural Sciences > Agriculture, forestry and fisheries
Divisions: Scientific Tobacco Institute
Depositing User: Prof. d-r. Ana Korubin - Aleksoska
Date Deposited: 02 Apr 2020 18:45
Last Modified: 02 Apr 2020 18:45

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