Infection of mungbean seed is more likely to result from localised pod infection than from systemic plant infection
Article
Article Title | Infection of mungbean seed is more likely to result from localised pod infection than from systemic plant infection |
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ERA Journal ID | 2652 |
Article Category | Article |
Authors | Fuhlbohm, M. J. (Author), Ryley, M. J. (Author) and Aitken, E. A. B. (Author) |
Journal Title | Plant Pathology |
Journal Citation | 62 (6), pp. 1271-1284 |
Number of Pages | 14 |
Year | 2013 |
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/ppa.12047 |
Web Address (URL) | http://onlinelibrary.wiley.com/doi/10.1111/ppa.12047/pdf |
Abstract | The ubiquitous fungal pathogen Macrophomina phaseolina is best known as causing charcoal rot and premature death when host plants are subject to post-flowering stress. Overseas reports of M. phaseolina causing a rapid rot during the sprouting of Australian mungbean seed resulted in an investigation of the possible modes of infection of seed. Isolations from serial portions of 10 mungbean plants naturally infected with the pathogen revealed that on most plants there were discrete portions of infected tissue separated by apparently healthy tissue. The results from these studies, together with molecular analysis of isolates collected from infected tissue on two of the plants, suggested that aerial infection of aboveground parts by different isolates is common. Inoculations of roots and aboveground parts of potted mungbean plants at nine moisture x temperature incubation combinations and of detached green pods strongly supported the concept that seed infection results from infection of pods by microsclerotia, rather than from hyphae growing systemically through the plant after root or stem infection. This proposal is reinforced by anecdotal evidence that high levels of seed infection are common when rainfall occurs during pod fill, and by the isolation of M. phaseolina from soil peds collected on pods of mungbean plants in the field. However, other experiments showed that when inoculum was placed with 130 mm of a green developing pod and a herbicide containing paraquat and diquat was sprayed on the inoculated plants, M. phaseolina was capable of partly systemic growth from vegetative tissue into the pods and seeds. |
Keywords | charcoal rot; infection; Macrophomina phaseolina; mungbean; seed |
ANZSRC Field of Research 2020 | 310805. Plant pathology |
300409. Crop and pasture protection (incl. pests, diseases and weeds) | |
310702. Infectious agents | |
Public Notes | © 2013 British Society for Plant Pathology. Published version deposited in accordance with the copyright policy of the publisher. |
Byline Affiliations | University of Queensland |
Department of Employment, Economic Development and Innovation, Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q263q/infection-of-mungbean-seed-is-more-likely-to-result-from-localised-pod-infection-than-from-systemic-plant-infection
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