Phytocercomonas venanatans, a New Species of Cercozoa Associated with Chlorotic Streak of Sugarcane

Article


Ngo, Chuong N., Braithwaite, K.S., Bass, D., Young, A.J. and Croft, B.. 2018. "Phytocercomonas venanatans, a New Species of Cercozoa Associated with Chlorotic Streak of Sugarcane ." Phytopathology: International Journal of the American Phytopathological Society. 108 (4), pp. 479-486. https://doi.org/10.1094/PHYTO-07-17-0237-R
Article Title

Phytocercomonas venanatans, a New Species of Cercozoa Associated with Chlorotic Streak of Sugarcane

ERA Journal ID2639
Article CategoryArticle
AuthorsNgo, Chuong N., Braithwaite, K.S., Bass, D., Young, A.J. and Croft, B.
Journal TitlePhytopathology: International Journal of the American Phytopathological Society
Journal Citation108 (4), pp. 479-486
Number of Pages8
YearApr 2018
PublisherAmerican Phytopathological Society
Place of PublicationUnited States
ISSN0031-949X
1943-7684
Digital Object Identifier (DOI)https://doi.org/10.1094/PHYTO-07-17-0237-R
Web Address (URL)https://apsjournals.apsnet.org/doi/10.1094/PHYTO-07-17-0237-R
Abstract

Chlorotic streak is a global disease of commercial sugarcane (Saccharum spp. hybrids). The disease is transmitted by wet soil, water, as well as in diseased planting material. Although first recognized almost 90 years ago and despite significant research effort, the identity of the causal agent has been elusive. Metagenomic high throughput sequencing (HTS) facilitated the discovery of novel protistan ribosomal and nuclear genes in chlorotic streak-infected sugarcane. These sequences suggest a possible causal agent belonging to the order Cercomonadida (Rhizaria, phylum Cercozoa). An organism with morphological features similar to cercomonads (=Cercomonadida) was isolated into pure axenic culture from internal stalk tissues of infected sugarcane. The isolated organism contained DNA sequences identical to those identified in infected plants by HTS. The DNA sequences and the morphology of the organism did not match any known species. Here we present a new genus and species, Phytocercomonas venanatans, which is associated with chlorotic streak of sugarcane. Amplicon sequencing also supports that P. venanatans is associated with this disease. This is the first reported member from Cercomonadida showing a probable pathogenic association with higher plants.

KeywordsSugarcane; Chlorotic streak
ANZSRC Field of Research 2020300409. Crop and pasture protection (incl. pests, diseases and weeds)
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Byline AffiliationsSugar Research Australia, Australia
Natural History Museum London, United Kingdom
Centre for Crop Health
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