Sorghum ergot can develop without local Claviceps africana inoculum from nearby infected plants
Article
Article Title | Sorghum ergot can develop without local Claviceps africana inoculum from nearby infected plants |
---|---|
ERA Journal ID | 2652 |
Article Category | Article |
Authors | Chakraborty, S. (Author) and Ryley, M. J. (Author) |
Journal Title | Plant Pathology |
Journal Citation | 57 (3), pp. 484-492 |
Number of Pages | 9 |
Year | 2008 |
Publisher | John Wiley & Sons |
Place of Publication | Chichester, West Sussex. United Kingdom |
ISSN | 0032-0862 |
1365-3059 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1365-3059.2008.01832.x |
Web Address (URL) | http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3059.2008.01832.x/pdf |
Abstract | Batches of glasshouse-grown flowering sorghum plants were placed in circular plots for 24hr at two field sites in southeast Queensland, Australia on 38 occasions in 2003 and 2004, to trap aerial inoculum of Claviceps africana. Plants were located 20-200m from the centre of the plots. Batches of sorghum plants with secondary conidia of C. africana on inoculated spikelets were placed at the centre of each plot on some dates as a local point source of inoculum. Plants exposed to field inoculum were returned to a glasshouse, incubated at near-100% relative humidity for 48hr and then at ambient relative humidity for another week before counting infected spikelets to estimate pathogen dispersal. Three times as many spikelets became infected when inoculum was present within 200m of trap plants, but infected spikelets did not decline with increasing distance from local source within the 200m. Spikelets also became infected on all 10 dates when plants were exposed without a local source of infected plants, indicating that infection can occur from conidia surviving in the atmosphere. In 2005, when trap plants were placed at 14 locations along a 280km route, infected spikelets diminished with increasing distance from sorghum paddocks and infection was sporadic for distances over 1km. Multiple regression analysis showed significant influence of moisture related weather variables on inoculum dispersal. Results suggest that sanitation measures can help reduce ergot severity at the local level, but sustainable management will require better understanding of long-distance dispersal of C. africana inoculum. |
Keywords | aerial spore dispersal; long-distance spore dispersal; secondary conidia; sorghum bicolor |
ANZSRC Field of Research 2020 | 310705. Mycology |
300409. Crop and pasture protection (incl. pests, diseases and weeds) | |
310804. Plant developmental and reproductive biology | |
Public Notes | © 2008 CSIRO. Published version deposited in accordance with the copyright policy of the publisher. |
Byline Affiliations | Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia |
Department of Primary Industries and Fisheries, Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q26wx/sorghum-ergot-can-develop-without-local-claviceps-africana-inoculum-from-nearby-infected-plants
1655
total views6
total downloads1
views this month0
downloads this month