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Genetic Analysis of Adult-Plant Resistance to Leaf Rust in Five Spring Wheat Genotypes
A Navabi1, R P Singh2, J P Tewari3
1Department of Agricultural, Food, and Nutritional Science, 4-10 Agriculture/Forestry Center, University of Alberta, Edmonton, AB, T6G 2P5, Canada.
Plant Disease
|March 1, 2019
Summary
Adult-plant resistance to wheat leaf rust is inherited through multiple genes, including Lr34, with additive gene action. This genetic understanding aids in breeding more resilient wheat varieties against Puccinia triticina.
Area of Science:
- Plant genetics
- Agricultural science
- Crop pathology
Background:
- Wheat leaf rust, caused by Puccinia triticina, significantly impacts global crop yields.
- Understanding the genetic basis of adult-plant resistance (APR) is crucial for developing durable resistance in wheat (Triticum aestivum).
Purpose of the Study:
- To investigate the inheritance patterns of APR to leaf rust in wheat.
- To identify the genetic components controlling APR and their interactions.
Main Methods:
- A one-way diallel cross was performed using five CIMMYT-derived resistant wheat genotypes and one susceptible genotype ('Avocet-YrA').
- Progenies (F1, F2, F3, F5) were evaluated under artificial leaf rust epidemics (MCJ/SP).
- Genetic analysis included assessing combining ability and heritability estimates.
Main Results:
- Adult-plant resistance was incompletely dominant and controlled by additive gene action, involving Lr34 and 2-3 additional genes.
- Transgressive segregation was observed, indicating the presence of nonallelic additive genes.
- General combining ability was the primary source of variation, with high narrow-sense heritability (0.67–0.97).
Conclusions:
- Wheat APR to leaf rust is a complex trait governed by multiple additive genes, with Lr34 playing a significant role.
- The findings provide valuable insights for marker-assisted selection and breeding programs aimed at enhancing wheat's resistance to Puccinia triticina.
Keywords:
diallel analysis
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