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RESEARCH ARTICLE
Contents Vol 45(9)

New sources of resistance in Trifolium subterraneum to rust (Uromyces trifolii-repentis)

M. J. Barbetti A C and P. G. H. Nichols B
+ Author Affiliations
- Author Affiliations

A School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.

B Western Australian Department of Agriculture, Baron-Hay Court, South Perth, WA 6151, Australia.

C Corresponding author. Email: mbarbett@cyllene.uwa.edu.au

Australian Journal of Experimental Agriculture 45(9) 1163-1166 https://doi.org/10.1071/EA04150
Submitted: 29 July 2004  Accepted: 13 December 2004   Published: 10 October 2005

Abstract

Fifty-seven genotypes, including 10 cultivars, of Trifolium subterraneum var. subterraneum and var. yanninicum were screened in the field for resistance to rust (Uromyces trifolii-repentis) using artificial inoculation. There was outstanding resistance among the var. yanninicum, types with all but 1 genotype showing no rust symptoms. Several var. subterraneum genotypes also showed only a low rust incidence (≤3.5 on a 0–10 scale) with little or no leaf collapse from rust infection, including 83S19–07, CPI 103906F, EP132Sub-E, 84S20–02, and 84S20–01. Several other lines had a significant incidence of rust, while little leaf collapse from the disease was evident. Several highly susceptible lines were identified, including cultivars Green Range, Seaton Park and York, all with 100% of leaves affected by rust and extensive leaf collapse. There was excellent positive correlation between rust incidence and leaf collapse across the genotypes tested (R2 = 0.91). The excellent rust resistance observed in the majority of var. yanninicum lines and the good resistance in some var. subterraneum lines, indicates that these are useful sources of resistance that can be exploited, either directly as new cultivars to minimise leaf collapse from this disease or as parents in breeding programmes to develop more rust-resistant cultivars.

Additional keywords: disease screening, incidence, severity.


Acknowledgments

We thank Dr Ming Pei You for statistical analyses; Mr William Pickering, Mr Russell Skinner and Mr John Titterington for technical assistance; and Australian Wool International for financial support.


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