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RESEARCH ARTICLE

Genetic interaction and inheritance of important traits in durum (Triticum turgidum ssp. durum) × emmer (Triticum turgidum ssp. dicoccum) crosses under two water regimes

Majid Mohammadi A , Aghafakhr Mirlohi https://orcid.org/0000-0002-3445-5770 A * , Mohammad Mahdi Majidi https://orcid.org/0000-0003-4746-9036 A , Mohsen Esmaeilzadeh Moghaddam B , Farzaneh Rabbani A and Fatemeh Noori A
+ Author Affiliations
- Author Affiliations

A Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran.

B Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj 31395-33151, Iran.

* Correspondence to: mirlohi@iut.ac.ir

Handling Editor: Victor Sadras

Crop & Pasture Science 72(11) 874-890 https://doi.org/10.1071/CP21118
Submitted: 28 February 2021  Accepted: 2 August 2021   Published: 12 November 2021

© 2021 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Emmer wheat (Triticum turgidum ssp. dicoccum) is an important gene source for wheat improvement but less studied in crosses with its descendant species durum (Triticum turgidum ssp. durum), especially in respect to the type of genetic components, intergenic interactions and the genetic mechanisms governing responses to drought. In this study, generation means analysis was performed using F1, F2, BC1P1 and BC1P2 from two different crosses of emmer × durum. Seeds were planted in a RCBD design with three replications under two water regimes. Results showed that there was a highly considerable difference between generations for all studied traits. The presence of significant mean parameter for all the traits, indicated the quantitative inheritance of the traits. Estimating the number of effective genes, polygenic control of the traits were confirmed. In moisture stress condition, epistatic effect for grain yield and yield-related traits illustrated the importance of epistasis in plant adaptation and performance stability. The additive × additive effect, which is fixable, was remarkable in both crosses. Under both water regimes, narrow-sense heritability was relatively high and estimates of gain from selection were positive for most of the traits. Among generations studied, the backcrosses were superior for drought tolerant indices. Based on the results, emmer wheat seems to have genetic potential for durum improvement.

Keywords: backcross breeding, drought stress, epistasis effects, genetic bottleneck, genetic gain, number of effective genes, polygenic control, tetraploid wheat.


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