Genetic improvement of lucerne for anthracnose (<i>Colletotrichum trifolii</i>) resistance

Irwin, J. A. G.; Aitken, Karen S.; Mackie, J. M.; Musial, J. M.

doi:10.1071/ap06059

Cited by 16 publications

(4 citation statements)

References 29 publications

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“…Unfortunately, the model of single tetrasomic gene inheritance could not be verified using Australian germplasm. Depending on the plant material, resistance was either simply inherited and of qualitative nature or of quantitative nature where several QTL with small-to-medium effects were involved in resistance (Mackie et al 2003(Mackie et al , 2007Irwin et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Phenotypic variation and quantitative trait loci for resistance to southern anthracnose and clover rot in red clover

et al. 2022

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Key message High variability for and candidate loci associated with resistance to southern anthracnose and clover rot in a worldwide collection of red clover provide a first basis for genomics-assisted breeding. Abstract Red clover (Trifolium pratense L.) is an important forage legume of temperate regions, particularly valued for its high yield potential and its high forage quality. Despite substantial breeding progress during the last decades, continuous improvement of cultivars is crucial to ensure yield stability in view of newly emerging diseases or changing climatic conditions. The high amount of genetic diversity present in red clover ecotypes, landraces, and cultivars provides an invaluable, but often unexploited resource for the improvement of key traits such as yield, quality, and resistance to biotic and abiotic stresses. A collection of 397 red clover accessions was genotyped using a pooled genotyping-by-sequencing approach with 200 plants per accession. Resistance to the two most pertinent diseases in red clover production, southern anthracnose caused by Colletotrichum trifolii, and clover rot caused by Sclerotinia trifoliorum, was assessed using spray inoculation. The mean survival rate for southern anthracnose was 22.9% and the mean resistance index for clover rot was 34.0%. Genome-wide association analysis revealed several loci significantly associated with resistance to southern anthracnose and clover rot. Most of these loci are in coding regions. One quantitative trait locus (QTL) on chromosome 1 explained 16.8% of the variation in resistance to southern anthracnose. For clover rot resistance we found eight QTL, explaining together 80.2% of the total phenotypic variation. The SNPs associated with these QTL provide a promising resource for marker-assisted selection in existing breeding programs, facilitating the development of novel cultivars with increased resistance against two devastating fungal diseases of red clover.

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Section: Discussionmentioning

confidence: 99%

Phenotypic variation and quantitative trait loci for resistance to southern anthracnose and clover rot in red clover

et al. 2022

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“…It means that every alfalfa cultivar may contain a varying proportion of susceptible and resistant plants. Irwin et al ( 2006 ) indicated the importance of increasing the proportion of individual plants resistant to Colletotrichum trifolii within alfalfa cultivars. The response of individual plants within varieties to inoculation with pathogenic isolates was also very variable.…”

Section: Resultsmentioning

confidence: 99%

Quantitative Traits Breeding for Multifunctional Grasslands and Turf

Sokolović¹,

Huyghe²,

Radovic³

2014

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“…Mackie et al (2007) linked races 1, 2 and 4 of C. trifolii to quantitative trait loci (QTL) conferring resistance to C. trifolii in lucerne. However, since the relationship between specific genes for avirulence in the pathogen and resistance genes in the host has not been established, these variations in the pathogen should be referred to as pathotypes as described by Irwin et al (2006).…”

Section: Infraspecific Taxonomymentioning

confidence: 99%

First Report of Anthracnose Caused by Colletotrichum brevisporum on Gac (Momordica cochinchinensis) in Thailand

Chai

Zhao

et al. 2018

Plant Disease

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Colletotrichum is the causal agent of anthracnose and other diseases on leaves, stems and fruits of numerous plant species, including several important crops. Accurate species identification is critical to understand the epidemiology and to develop effective control of these diseases. Morphologically-based identification of Colletotrichum species has always been problematic, because there are few reliable characters and many of these characters are plastic, dependent upon methods and experimental conditions. Rapid progress in molecular phylogenetic methods is now making it possible to recognise stable and well-resolved clades within Colletotrichum. How these should be reflected in a classification system remains to be resolved. An important step in providing a stable taxonomy for the genus is to epitypify existing names, and in so doing link them to genetically defined clades. We recommend a polyphasic approach to the recognition and identification of species within Colletotrichum, matching genetic distinctness with informative morphological and biological characters. This paper reviews various approaches in the study of Colletotrichum complexes including morphology, pathogenicity, physiology, phylogenetics and secondary metabolite production. A backbone phylogenetic tree using ITS sequence data from 42 ex-type specimens has been generated. Phylogenetic analysis using ITS sequence data is a useful tool to give a preliminarily identification for Colletotrichum species or place them in species complexes. However, caution must be taken here as the majority of the ITS sequences deposited in GenBank are wrongly named. Multi-gene phylogenetic data provides much better understanding of the relationships within Colletotrichum and should be employed where possible. We propose that an ideal approach for Colletotrichum systematics should be based on a multi-gene phylogeny, with comparison made with type specimens, and a well-defined phylogenetic lineage should be in conjunction with recognisable polyphasic characters, such as morphology, physiology, pathogenicity, cultural characteristics and secondary metabolites. Finally a set of protocols and methodologies is provided as a guideline for future studies, epitypification and the description of new species.

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Genetic improvement of lucerne for anthracnose (Colletotrichum trifolii) resistance

Cited by 16 publications

References 29 publications

Phenotypic variation and quantitative trait loci for resistance to southern anthracnose and clover rot in red clover

Phenotypic variation and quantitative trait loci for resistance to southern anthracnose and clover rot in red clover

Quantitative Traits Breeding for Multifunctional Grasslands and Turf

First Report of Anthracnose Caused by Colletotrichum brevisporum on Gac (Momordica cochinchinensis) in Thailand

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