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4 September 2013 Interactions between waterlogging and ray blight in pyrethrum
Muhammad Javid, Pingjie Zhang, Paul W. J. Taylor, Sarah J. Pethybridge, Tim Groom, Marc E. Nicolas
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The effects of waterlogging, alone and combined with ray blight disease (caused by Stagonosporopsis tanaceti), on pyrethrum (Tanacetum cinerariifolium) plant growth were quantified in glasshouse trials. Six pyrethrum cultivars were initially studied for their response to 6 days of waterlogging and their recovery from waterlogging during 26 days post-waterlogging. Waterlogging caused substantial root death and leaf wilting and accelerated senescence in all cultivars. Root growth was 80% more reduced than shoot growth. Cultivar ‘F’ showed significantly higher root porosity and growth following waterlogging than other cultivars. In contrast, cv. ‘C’ had the greatest growth reduction from waterlogging and poor root-system recovery after waterlogging. Plants of cvv. C and F inoculated with S. tanaceti and then waterlogged were more significantly affected than were those exposed to waterlogging only. For both cultivars, shoot growth under the combined treatment, relative to initial growth, recovered up to 25%, but root growth suffered irreversible damage. The combined treatment decreased the number of stems by 39% compared with waterlogging alone after the post-waterlogging period. In conclusion, pyrethrum cultivars showed differential reactions to waterlogging; but growth in all cultivars was seriously affected by a combination of waterlogging and infection by ray blight.

© CSIRO 2013
Muhammad Javid, Pingjie Zhang, Paul W. J. Taylor, Sarah J. Pethybridge, Tim Groom, and Marc E. Nicolas "Interactions between waterlogging and ray blight in pyrethrum," Crop and Pasture Science 64(7), 726-735, (4 September 2013).
Received: 15 February 2013; Accepted: 1 July 2013; Published: 4 September 2013
growth recovery
ray blight
tolerance responses
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