Abstract
Pleiochaeta root rot (PRR) caused by Pleiochaeta setosa is a serious, widespread fungal disease in lupin crops, especially in Lupinus albus (broad-leaf lupin, or white lupin). PRR resistance is common in the gene pool of L. albus with various landraces from the Mediterranean region being the most resistant, and suitable for use in breeding new cultivars. Heritability of resistance is sufficient to make good gains from selection but only when controlled-environment (CE) screening is used. Field disease nurseries on loamy soil gave much lower heritability of resistance. Field disease nurseries had spatially variable spore counts despite continuous lupin cropping, and this was partly responsible (along with climatic conditions) for their reduced precision compared to tests conducted in a CE. Giving infected L. albus roots a single, most-severe-lesion score on a 0–9 scale was adequate for CE screening but not as precise or discriminating as the more time-consuming method of six scores per root. Replication in CE experiments was reduced to two pots of 16 seedlings each without sacrificing genotype discrimination.
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Abbreviations
- BLS:
-
Brown leaf spot
- CE:
-
Controlled environment
- DN:
-
Disease nursery
- PRR:
-
Pleiochaeta root rot
- REML:
-
Residual maximum likelihood
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Acknowledgements
This work was partly supported by the GRDC (Grains Research & Development Corporation, Australia). We thank Bev Orchard for help with statistical advice. Colin Smith and Jon Clements provided seed from the Australian Lupin Germplasm Collection held at DAFWA in Perth, Western Australia. We thank John Harper and Gavin Ash for encouragement.
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Luckett, D.J., Cowley, R.B., Richards, M.F. et al. Breeding Lupinus albus for resistance to the root pathogen Pleiochaeta setosa . Eur J Plant Pathol 125, 131–141 (2009). https://doi.org/10.1007/s10658-009-9465-8
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DOI: https://doi.org/10.1007/s10658-009-9465-8