Quantitative analysis of gene actions controlling root length under water stress in spring wheat (Triticum aestivum L.) genotypes
Habtamu Ayalew A B , Hui Liu A and Guijun Yan A C
+ Author Affiliations
- Author Affiliations
A School of Plant Biology, Faculty of Science and Institute of Agriculture, The University of Western Australia, Crawley, WA 6009, Australia.
B Department of Horticulture, College of Agriculture and Natural Resources, Debre Markos University, PO Box 269, Debre Markos, Ethiopia.
C Corresponding author. Email: guijun.yan@uwa.edu.au
Crop and Pasture Science 67(5) 489-494 https://doi.org/10.1071/CP15244
Submitted: 22 July 2015 Accepted: 24 November 2015 Published: 31 May 2016
Abstract
Understanding the genetic control of agronomic traits is important in designing crop improvement programs. Study was conducted to analyse the genetic control of root length under water stress. A full diallel cross of four spring wheat lines, along with their F1 progenies was evaluated under –0.82 MPa water stress in a hydroponic culture. Analysis of variance showed highly significant (P < 0.01) difference among the parental lines and their F1 progenies. Genotypes Santa Elena, Colotana 296–52 and Pato showed comparable longer roots whereas Tincurrin grew significantly (P < 0.05) shorter roots. Genotypes with long roots were found to have more dominant genes than those with shorter roots. Both general and specific combining abilities were highly significant (P < 0.01) indicating the importance of additive and dominant gene effects in the control of root length under water stress. Genotype Santa Elena was found to be the best general combiner whereas the specific cross Santa Elena × Pato was the best hybrid. Moderate narrow-sense heritability (38%) was observed indicating the possibility of improving root length under water stress. The highly significant specific combining ability value (dominant genetic control) suggests that genotypes with more dominant genes should be selected as parents for hybridisation and the hybrid wheat approach might be helpful in improving water stress resistance.
Additional keywords: crop improvement, diallel analysis, drought tolerance.
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