Sweet potato little leaf strain V4 phytoplasma associated with snake bean in the Northern Territory, Australia

Tran-Nguyen, Lucy T. T.; Smith, Stanley W.; Liberato, J. R.

doi:10.1007/s13314-012-0071-9

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…Less common, regional diseases that can cause spoilage in storage roots Clark et al (2013) Bacterial soft rot Dickeya dadantii (Erwinia chrysanthemi) Major problem in storage or transport to markets Kokoa (2001) a This taxonomy is based on SPLL detected in Australia (Tran-Nguyen et al, 2012). No reference was found for any testing on SPLL elsewhere.…”

Section: Rotsmentioning

confidence: 99%

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Invertebrate pests and diseases of sweetpotato (Ipomoea batatas): a review and identification of research priorities for smallholder production

Johnson

Gurr

2016

Ann Appl Biol

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Sweetpotato has been the subject of little research worldwide compared with other major crop staples, and this is especially so for less developed countries where sweetpotato is critical for food security. This review synthesises information on plant protection issues that affect smallholder sweetpotato farmers in less developed countries to identify major issues and suggest research priorities. Though the pests and diseases of sweetpotato in less developed countries are largely common to industrialised systems, their relative importance differs and losses tend to be more severe as a result of differing agronomic practices and relative unavailability of management options and technical support that are important in developed countries. Smallholders are heavily reliant on cultural practices such as traditional forms of biological control using ants and livestock, fallowing and composting (sometimes with plant materials having biocidal properties). Crop protection methods that have been developed for use in sweetpotato production in developed countries, such as pathogen-tested planting material, early maturing varieties, pheromone trapping and pesticides are less accessible to, and relevant for, smallholders. Smallholders also typically harvest a given crop progressively which extends the period over which storage roots are potentially vulnerable to attack but reduces the risk of post-harvest losses. Human population growth in developing countries is leading to an increase in cropping intensity with shorter fallow periods and more years of continuous crops. This has the dual effect of depleting soil nutrients and increasing the potential for pest and pathogen build-up. Associated with this, the adoption of strategies to manage crop nutrition, such as not burning crop residues, promote carryover of pests and pathogen inocula. As a consequence of these factors, sweetpotato yield losses from diseases, especially viruses, and pests, particularly weevils, can be high. Climate change is likely to result in more frequent drought and this will increase losses caused by sweetpotato weevils that are favoured by dry conditions. This review of sweetpotato pests and their management options concludes with suggestions for some future research priorities including the combination of traditional practices that have pest management outcomes with relevant practices from industrial production that are able to be transferred or modified for use in smallholder production. Increased technical support for decision making and diagnostics, including molecular approaches that have scope for field use, will be important in reducing the burden imposed by biotic threats to this important global crop.

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Section: Rotsmentioning

confidence: 99%

“…Sweetpotato little leaf (SPLL) is reported from parts of Oceania (Clark et al, 2002), parts of Asia (Clark et al, 2013) and is common in northern Australia (Davis et al, 2003;Tran-Nguyen et al, 2012). Common symptoms of infection include yellowing, stunting and various growth and flowering abnormalities.…”

Section: Phytoplasmasmentioning

confidence: 99%

Invertebrate pests and diseases of sweetpotato (Ipomoea batatas): a review and identification of research priorities for smallholder production

Johnson

Gurr

2016

Ann Appl Biol

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“…[8, 12]), Echinacea purpurea (previous detection in Echinacea pallida [69]), Gomphocarpus fruticosus (previous detection in Gomphocarpus physocarpus [70]), Goodenia scaevolina (previous detection reported as Goodenia sp. [13]), and Phyllanthus fuernrohrii (previous detection in Phyllanthus amarus [71]) ( and S1).…”

Section: Resultsmentioning

confidence: 95%

A metagenomic investigation of phytoplasma diversity in Australian vegetable growing regions

Rodrigues Jardim,

Gambley,

Tran-Nguyen

et al. 2024

Microbial Genomics

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In this study, metagenomic sequence data was used to investigate the phytoplasma taxonomic diversity in vegetable-growing regions across Australia. Metagenomic sequencing was performed on 195 phytoplasma-positive samples, originating either from historic collections (n=46) or during collection efforts between January 2015 and June 2022 (n=149). The sampled hosts were classified as crop (n=155), weed (n=24), ornamental (n=7), native plant (n=6), and insect (n=3) species. Most samples came from Queensland (n=78), followed by Western Australia (n=46), the Northern Territory (n=32), New South Wales (n=17), and Victoria (n=10). Of the 195 draft phytoplasma genomes, 178 met our genome criteria for comparison using an average nucleotide identity approach. Ten distinct phytoplasma species were identified and could be classified within the 16SrII, 16SrXII (PCR only), 16SrXXV, and 16SrXXXVIII phytoplasma groups, which have all previously been recorded in Australia. The most commonly detected phytoplasma taxa in this study were species and subspecies classified within the 16SrII group (n=153), followed by strains within the 16SrXXXVIII group (‘Ca. Phytoplasma stylosanthis’; n=6). Several geographic- and host-range expansions were reported, as well as mixed phytoplasma infections of 16SrII taxa and ‘Ca. Phytoplasma stylosanthis’. Additionally, six previously unrecorded 16SrII taxa were identified, including five putative subspecies of ‘Ca. Phytoplasma australasiaticum’ and a new putative 16SrII species. PCR and sequencing of the 16S rRNA gene was a suitable triage tool for preliminary phytoplasma detection. Metagenomic sequencing, however, allowed for higher-resolution identification of the phytoplasmas, including mixed infections, than was afforded by only direct Sanger sequencing of the 16S rRNA gene. Since the metagenomic approach theoretically obtains sequences of all organisms in a sample, this approach was useful to confirm the host family, genus, and/or species. In addition to improving our understanding of the phytoplasma species that affect crop production in Australia, the study also significantly expands the genomic sequence data available in public sequence repositories to contribute to phytoplasma molecular epidemiology studies, revision of taxonomy, and improved diagnostics.

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Update on phytoplasma diseases associated with starchy root and tuber crops in Asia

Reddy¹,

Serçe²,

Hoat³

et al. 2023

Phytoplasma Diseases of Major Crops, Trees, and Weeds

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Sweet potato little leaf strain V4 phytoplasma associated with snake bean in the Northern Territory, Australia

Cited by 6 publications

References 15 publications

Invertebrate pests and diseases of sweetpotato (Ipomoea batatas): a review and identification of research priorities for smallholder production

Invertebrate pests and diseases of sweetpotato (Ipomoea batatas): a review and identification of research priorities for smallholder production

A metagenomic investigation of phytoplasma diversity in Australian vegetable growing regions

Update on phytoplasma diseases associated with starchy root and tuber crops in Asia

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