Journal article
Differential Symptom Development and Viral RNA Loads in 10 Nicotiana benthamiana Accessions Infected with the Tobamovirus Yellow Tailflower Mild Mottle Virus
Plant disease, Vol.106(3), pp.984-989
2022
PMID: 34735277
Abstract
Yellow tailflower mild mottle virus (YTMMV, genus Tobamovirus) was identified from wild plants of solanaceous species in Australia. Nicotiana benthamiana is a species indigenous to the arid north of Australia. N. benthamiana accession RA-4 (the lab type), which has a mutant, functionally defective, RNA-dependent RNA polymerase 1 (Rdr1) gene (Nb-Rdr1m), has played a significant role in plant virology, but little study has been done regarding responses to virus infection by other accessions of N. benthamiana. All wild-collected N. benthamiana accessions used in this study harbored wild-type Rdr1 genes (Nb-Rdr1). We compared symptoms of YTMMV infection and viral RNA load on RA-4 and nine wild-collected accessions of N. benthamiana from mainland Western Australia, an island, and the Northern Territory. After inoculation with YTMMV, RA-4 plants responded with systemic hypersensitivity and all individuals were dead 35 days postinoculation (dpi). Plants of wild-collected accessions exhibited a range of symptoms, from mild to severe, and some, but not all, died in the same period. Quantitative reverse transcription PCR revealed that the Rdr1 mutation was not a predictor of viral RNA load or symptom severity. For example, wild-collected A019412 plants carried more than twice the viral RNA load of RA-4 plants, but symptom expression was moderate. For plants of most accessions, viral RNA load did not increase after 10 dpi. The exception was plants of accession Barrow-1, in which viral RNA load was low until 15 dpi, after which it increased more than 29-fold. This study revealed differential responses by N. benthamiana accessions to infection by an isolate of YTMMV. The Rdr1 gene, whether mutant or wild-type, did not appear to influence viral RNA load or disease expression. Genetic diversity of the 10 N. benthamiana accessions in some cases reflected geographical location, but in other accessions this was not so.
Details
- Title
- Differential Symptom Development and Viral RNA Loads in 10 Nicotiana benthamiana Accessions Infected with the Tobamovirus Yellow Tailflower Mild Mottle Virus
- Authors/Creators
- Weinan Xu - Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, ChinaYuxia Guo - College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, ChinaHua Li - Plant Biotechnology Research Group (Virology), Western Australian State Agricultural Biotechnology Centre, Murdoch University, Murdoch 6150, AustraliaKrishnapillai Sivasithamparam - Plant Biotechnology Research Group (Virology), Western Australian State Agricultural Biotechnology Centre, Murdoch University, Murdoch 6150, AustraliaMichael G K Jones - Plant Biotechnology Research Group (Virology), Western Australian State Agricultural Biotechnology Centre, Murdoch University, Murdoch 6150, AustraliaXin Chen - Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, ChinaSteve Wylie - Plant Biotechnology Research Group (Virology), Western Australian State Agricultural Biotechnology Centre, Murdoch University, Murdoch 6150, Australia
- Publication Details
- Plant disease, Vol.106(3), pp.984-989
- Publisher
- The American Phytopathological Society
- Identifiers
- 991005649369607891
- Copyright
- © 2022 The American Phytopathological Society
- Murdoch Affiliation
- Food Futures Institute
- Language
- English
- Resource Type
- Journal article
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- 3.267 Virology - Plant
- 3.267.356 Plant Virus Interactions
- Web Of Science research areas
- Plant Sciences
- ESI research areas
- Plant & Animal Science