Infection of mungbean seed is more likely to result from localised pod infection than from systemic plant infection

Article


Fuhlbohm, M. J., Ryley, M. J. and Aitken, E. A. B.. 2013. "Infection of mungbean seed is more likely to result from localised pod infection than from systemic plant infection." Plant Pathology. 62 (6), pp. 1271-1284. https://doi.org/10.1111/ppa.12047
Article Title

Infection of mungbean seed is more likely to result from localised pod infection than from systemic plant infection

ERA Journal ID2652
Article CategoryArticle
AuthorsFuhlbohm, M. J. (Author), Ryley, M. J. (Author) and Aitken, E. A. B. (Author)
Journal TitlePlant Pathology
Journal Citation62 (6), pp. 1271-1284
Number of Pages14
Year2013
PublisherJohn Wiley & Sons
Place of PublicationChichester, West Sussex. United Kingdom
ISSN0032-0862
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.

Keywordscharcoal rot; infection; Macrophomina phaseolina; mungbean; seed
ANZSRC Field of Research 2020310805. 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 AffiliationsUniversity of Queensland
Department of Employment, Economic Development and Innovation, Queensland
Institution of OriginUniversity of Southern Queensland
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