Journal
PLANT JOURNAL
Volume 77, Issue 4, Pages 653-663Publisher
WILEY
DOI: 10.1111/tpj.12417
Keywords
plant-insect interactions; plant defense; mutualism; Myzus persicae; Nicotiana benthamiana; Arabidopsis thaliana; Turnip mosaic virus; Vector; Pathogen; aphid
Categories
Funding
- US National Science Foundation [IOS-1121788]
- United States Department of Agriculture [2010-65105-20558, 2013-2013-03265]
- American Society for Plant Biologists Summer Undergraduate Research Fellowship
- Binational Agricultural Research and Development Agency [US-4165-08C]
- Iowa State University Plant Sciences Institute Virus-Insect Interactions group
- NIFA [2010-65105-20558, 581007] Funding Source: Federal RePORTER
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1121788] Funding Source: National Science Foundation
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Many plant viruses depend on aphids and other phloem-feeding insects for transmission within and among host plants. Thus, viruses may promote their own transmission by manipulating plant physiology to attract aphids and increase aphid reproduction. Consistent with this hypothesis, Myzus persicae (green peach aphids) prefer to settle on Nicotiana benthamiana infected with Turnip mosaic virus (TuMV) and fecundity on virus-infected N.benthamiana and Arabidopsis thaliana (Arabidopsis) is higher than on uninfected controls. TuMV infection suppresses callose deposition, an important plant defense, and increases the amount of free amino acids, the major source of nitrogen for aphids. To investigate the underlying molecular mechanisms of this phenomenon, 10 TuMV genes were over-expressed in plants to determine their effects on aphid reproduction. Production of a single TuMV protein, nuclear inclusion a-protease domain (NIa-Pro), increased M.persicae reproduction on both N.benthamiana and Arabidopsis. Similar to the effects that are observed during TuMV infection, NIa-Pro expression alone increased aphid arrestment, suppressed callose deposition and increased the abundance of free amino acids. Together, these results suggest a function for the TuMV NIa-Pro protein in manipulating the physiology of host plants. By attracting aphid vectors and promoting their reproduction, TuMV may influence plant-aphid interactions to promote its own transmission.
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