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RESEARCH ARTICLE
Contents Vol 46(1)

Genotypic variation in metribuzin tolerance in narrow-leafed lupin (Lupinus angustifolius L.)

P. Si A C , M. W. Sweetingham A B , B. J. Buirchell A B , D. G. Bowran B and T. Piper B
+ Author Affiliations
- Author Affiliations

A Centre for Legumes in Mediterranean Agriculture, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.

B Western Australian Department of Agriculture, Locked Bag No. 4, Bentley Delivery Centre, WA 6983, Australia.

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

Australian Journal of Experimental Agriculture 46(1) 85-91 https://doi.org/10.1071/EA04272
Submitted: 21 December 2004  Accepted: 4 August 2005   Published: 9 February 2006

Abstract

Tolerance to metribuzin herbicide is an essential agronomic trait for narrow-leafed lupin (L. angustifolius L.) grown in Western Australia (WA), however, metribuzin causes up to 30% yield loss in cv. Tanjil. Tanjil is widely used as a parent in the WA lupin breeding programme to provide anthracnose resistance. Hence, identification of genotypes tolerant to metribuzin and incorporation of this tolerance into the disease-resistant cultivar is necessary for maintaining lupin production. This study identified tolerance to metribuzin among lupin cultivars and advanced breeding lines under both controlled temperature and natural winter conditions.

Differences in dose responses between cultivars revealed that cv. Gungurru was tolerant and cv. Tanjil susceptible to metribuzin. Gungurru seedlings survived metribuzin applications of up to 1600 g/ha, whereas Tanjil seedlings exhibited zero survival at 800 g/ha. The rate of herbicide application that caused a 50% growth reduction (GR50, excluding dead plants) for Gungurru was 2 times greater than that for Tanjil. The level of tolerance in Gungurru is adequate to protect plants against metribuzin damage in the field. Large and consistent differences in tolerance between genotypes were identified among cultivars and advanced breeding lines across controlled temperatures (20°C during the day and 12°C at night) and in natural winter conditions. One breeding line (95L208–13–13) showed marginally better tolerance than Gungurru. A number of advanced breeding lines were as susceptible to metribuzin as Tanjil, indicating that it is very important to select for metribuzin tolerance concurrently with disease resistance in the breeding programme. Of the 6 measures of tolerance used in this study, leaf score proved to be the simplest and most effective measure and could be used for the selection of individual tolerant plants in segregating populations. Tolerance was independent of early vigour, suggesting that it is possible to combine both early vigour and tolerance into a cultivar for better weed management. In conclusion, breeding for metribuzin tolerance in lupin is feasible, and the screening method tested here was simple and consistent, which would assist a breeding programme in making rapid progress towards herbicide-tolerant plants.

Additional keywords: dose response, early vigour, herbicide tolerance, leaf score.


Acknowledgments

The Grains Research and Development Cooperation (GRDC) provided financial support for this research. We are grateful to Mr Shrestha for technical support and to the Western Australian Herbicide Resistance Initiative for providing the herbicide application facility.


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