Inheritance of leaf resistance to Septoria nodorum Berk. in two crosses of spring wheat

Reijo Karjalainen

doi:10.23986/afsci.72139

Abstract

The F2 progeny of two spring wheat crosses involving susceptible and moderately resistant parent cultivars were tested in the field for their reaction to infection by Septoria nodorum Berk. The variation in symptom expression was continuous, providing no support for the existence of individually acting major genes. The broad sense heritability values for the crosses were moderate at 0.47 and 0.34 with over half of the variation being of environmental origin. The results are discussed in relation to developing a resistance breeding strategy for wheat to S. nodorum.

Highlights

Septoria nodorum Berk., the cause of the glume blotch disease of wheat, has become a major wheat pathogen in Europe, in several parts of Asia, and in South and North America (SAARI and WILCOXSON 1974).Resistance is the most feasible method for the control of the diseases in the Septoria complex in terms of economic advantage and long term protection (DOODSON 1981)
Available experimental analyses indicate that the resistance of wheat to S. nodorum is under polygenic control and involves several genes (LAUBSCHER et al 1966, NELSON 1980, MULLANEY et al 1982, SCOTT et al 1982)
There is some evidence that resistance at the seedling stage is conferred by dominant gene(s)

Summary

Introduction

Septoria nodorum Berk., the cause of the glume blotch disease of wheat, has become a major wheat pathogen in Europe, in several parts of Asia, and in South and North America (SAARI and WILCOXSON 1974).Resistance is the most feasible method for the control of the diseases in the Septoria complex in terms of economic advantage and long term protection (DOODSON 1981). Available experimental analyses indicate that the resistance of wheat to S. nodorum is under polygenic control and involves several genes (LAUBSCHER et al 1966, NELSON 1980, MULLANEY et al 1982, SCOTT et al 1982). There is some evidence that resistance at the seedling stage is conferred by dominant gene(s). KLEIJER et al (1977) have shown that the cultivar Atlas 66 carries a single dominant gene located on the wheat chromosome 1 B and this gene is responsible for resistance to S. nodorum at the seedling stage. Hitherto there is no evidence for the existence of single genes which alone could give an detectable level of resistance at the mature plant stage (SCHAREN and EYAL 1980)

Objectives

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Results