Optimal environmental conditions for the infection and development of Puccinia purpurea on sorghum

Article


White, J. A., Ryley, M. J., George, D. L. and Kong, G. A.. 2014. "Optimal environmental conditions for the infection and development of Puccinia purpurea on sorghum." Australasian Plant Pathology. 43 (4), pp. 447-457. https://doi.org/10.1007/s13313-014-0292-9
Article Title

Optimal environmental conditions for the infection and development of Puccinia purpurea on sorghum

ERA Journal ID2559
Article CategoryArticle
AuthorsWhite, J. A. (Author), Ryley, M. J. (Author), George, D. L. (Author) and Kong, G. A. (Author)
Journal TitleAustralasian Plant Pathology
Journal Citation43 (4), pp. 447-457
Number of Pages11
Year2014
PublisherSpringer
Place of PublicationDordrecht, Netherlands
ISSN0815-3191
1448-6032
Digital Object Identifier (DOI)https://doi.org/10.1007/s13313-014-0292-9
Web Address (URL)http://link.springer.com/article/10.1007/s13313-014-0292-9
Abstract

Although rust can reduce grain yields of late-planted sorghum crops in Queensland, little research has been conducted on environmental parameters affecting infection and development. The effects of temperature, leaf wetness period, plant growth stage, urediniospore concentration and darkness period on the development of rust (Puccinia purpurea) on the inbred Sorghum bicolor line IS8525 were evaluated separately by artificial inoculation of plants under controlled conditions. Rust developed between 16 and 28 °C, with the optimum temperature being 20 °C. Disease severity (pustules cm−2) increased as the length of leaf wetness increased from 4 to 24 h. Infection occurred when plants were exposed to full light, full darkness and varying periods of darkness for the first 24 h after inoculation; 16 h of darkness resulted in the highest rust severity. Plants of IS8525 and of the more resistant line IS12539 inoculated 21–49 days after sowing developed higher levels of rust than others inoculated at, or close to, flowering (63 days after sowing). Rust severity also increased with increasing urediniospore concentrations, but leaf death occurred on young plants inoculated with the highest concentration (50 mg 100 mL water−1). The findings of this study have been used to develop an inoculation technique to detect putative pathotypes of P. purpurea in Australia.

Keywordsartificial inoculation; darkness period; leaf wetness period; plant growth stage; temperature; Urediniospore concentration
ANZSRC Field of Research 2020310701. Bacteriology
300409. Crop and pasture protection (incl. pests, diseases and weeds)
300101. Agricultural biotechnology diagnostics (incl. biosensors)
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Byline AffiliationsDepartment of Agriculture, Fisheries and Forestry, Queensland
University of Queensland
Cooperative Research Centre for National Plant Biosecurity, Australia
Institution of OriginUniversity of Southern Queensland
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