Breeding barley varieties with durable resistance - Can the new technologies improve the odds
2004
Barr, A.R. | Eglinton, J.K. | Jefferies, S.P. (University of Adelaide, Waite Campus, Glen Osmond (South Australia). Department of Plant Science) | Wallwork, H. | Williams, K. | Davies, P.A. (South Australian Research and Development Inst., Waite Campus, Adelaide (South Australia)) | Brown, T. (CSIRO Plant Industry, Black Mountain, Canberra, Adelaide (South Australia))
South Australia is a dry environment and most barley growing regions lie between 35 and 38 degrees South with an annual rainfall of 250 - 500 mm. However, most of the cropping area is close to the coast and more humid than the rainfall would indicate. Foliar disease is common and, especially in more favourable seasons, can be severe. The most important diseases, in order of importance, are leaf scald, spot form net blotch (SFNB), leaf rust, net form net blotch (NFNB), powdery mildew and barley yellow dwarf. State-wide losses in favourable seasons may be 10%, 5%, 3%, 1%, 1% and 1% respectively. Note, these figures are variety/pathotype dependant. NFNB could be much more severe than SFNB in future, if projected changes in virulence occur Mildew would be much more severe but for the use of systemic seed treatments. Hence, breeding for resistance to a broad spectrum of diseases is an important priority for breeding programs across southern Australia. Farmers rate this as an important goal, especially in malting varieties where the level and breadth of disease resistance is considerably poorer than in feed varieties. In this paper, we discuss our strategies for breeding for resistance to these diseases and how we have integrated a number of new approaches into this strategy
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