Simultaneous selection of wheat plants with resistance to root-lesion nematodes, crown rot and yellow spot

Sheedy, J. G. and Thompson, J. P. and Reen, R. A. (2012) Simultaneous selection of wheat plants with resistance to root-lesion nematodes, crown rot and yellow spot. In: 7th Australasian Soilborne Diseases Symposium, 18-20 Sept 2012, Freemantle, WA, Australia.

Abstract

Root-lesion nematodes (Pratylenchus thornei [Pt] and P. neglectus [Pn]), crown rot (CR; Fusarium pseudograminearum) and yellow spot (YS; Pyrenophora triticirepentis) are four economically important diseases of wheat that commonly occur in combination and cost northern growers $137 M annually. Therefore, we need to develop germplasm with combinations of disease resistance to minimise yield loss in these situations. To achieve this, the established screening methods for each disease were combined and where necessary modified, to allow testing of up to 4 diseases simultaneously. Initial experiments tested every disease combination on up to 42 fixed cultivars covering resistant to susceptible disease reactions to develop a procedure that could be used to select individuals with resistance to Pt, Pn, CR and YS. This procedure was used to select resistant individuals in an experiment of 21 check cultivars and 132 segregating F3’s exposed to all 4 diseases. The check cultivars in the F3 experiment were significantly correlated with long-term rankings for YS (r = 0.96***), CR (r = -0.61**) Pt (r = 0.84**) and Pn (r = 0.52*) and we were able to select nine F3’s (7%) with resistance to all four diseases. This procedure will likely hasten the development of multiple-disease resistant parents, suitable for introduction into commercial breeding programs.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: Yes
Item Status: Live Archive
Additional Information: Abstract only published - #79.
Faculty / Department / School: No Faculty
Date Deposited: 05 Sep 2016 06:29
Last Modified: 30 Jun 2017 03:16
Fields of Research : 07 Agricultural and Veterinary Sciences > 0706 Horticultural Production > 070603 Horticultural Crop Protection (Pests, Diseases and Weeds)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
URI: http://eprints.usq.edu.au/id/eprint/29652

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