More specifically, will a plant virus achieve greater inoculation success if the vector feeds on a growing plant part vs. a senescent part?
I've heard that fast growing parts of a plant may be more susceptible to infection from viruses, but haven't been able to find anything empirical backing this up.
Hi Paul,
Not easy to give a straightforward answer to this question.
When we carry out manual and aphid inoculations in the lab/glasshouse we always carry these out on very young test plants (4 leaf stage, about 3 weeks post emergence), due to the increased success rate of transmission studies.
In terms of field relevance, there are several complicating factors in giving an overview answer. The first of these are that the response will depend upon the virus species (or even the strain), the plant host species (or even the cultivar) and the particular vector, the prevailing temperature and the pathosystem in question (e.g. sources of virus). An additional emerging factor is the effect of circadian rhythm on infection success.(see links to plantcell and sciencedirect below)
As a general rule young plants are considered more susceptible to virus infection than mature plants. However, this may (at least in part) be a function of the relative attractiveness of the plant to attack by the vectors (see link to Cambridge work below...).
Some further thoughts on the subject....
In seed potatoes, we recognise 'mature plant resistance' can affect the rates of translocation of the virus in the plant and this can affect the rate of secondary infections (vertical transmission) in subsequent crops. however, the rates of these changes vary with cultivar and strain of virus. (See de Bokx, 1972, Viruses of potatoes and seed-potato production, Chapter. 11 ).
We have also bee studying viruses of carrot crops and it looks as though the different viruses arrive in the crops in 'waves' through the growing season, some from wild hosts (weeds) and some from surrounding similar crops. This is possibly driven by both the emergence of reservoir hosts and the migration of aphids as much as the susceptibility of the receiver plant.
this is by no means a complete answer, but happy to discuss further...
http://www.plantcell.org/content/21/9/2546.full
http://www.sciencedirect.com/science/article/pii/S1369526613001003
https://www.cambridge.org/core/journals/bulletin-of-entomological-research/article/effects-of-plant-age-leaf-age-and-virus-yellows-infection-on-the-population-dynamics-of-myzus-persicae-homoptera-aphididae-on-sugarbeet-in-field-plots/9EEDA80503612DF11D22E72097446210
Paul,
I also meant to say that I realise the above comment doesn't directly answer your question, but I am not aware of any research which looks specifically at relative transmission to different parts of the same plant....
Good luck with your research,
Adrian
Dear Paul Chisholm
Usually we Called it age resistance, its not only for transmission by vectors, also affected by interference , signals and pathways, movement protein, plant hormone (http://www.springer.com/us/book/9789401792844)...
Pls. find the attached files
http://apsjournals.apsnet.org/doi/abs/10.1094/PDIS.2002.86.4.429
http://link.springer.com/article/10.1007/s00705-007-1086-y
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC160262/pdf/050191.pdf
http://vegetablemdonline.ppath.cornell.edu/factsheets/Virus_Pepper.htm
http://www.plantphysiol.org/content/153/4/1859.full
http://www.nature.com/nrmicro/journal/v3/n10/full/nrmicro1239.html
http://www.annualreviews.org/doi/abs/10.1146/annurev.py.10.090172.001141
http://ee.oxfordjournals.org/content/early/2015/01/21/ee.nvu013
http://www.microbiologyresearch.org/docserver/fulltext/jgv/78/10/0782683a.pdf?expires=1479317249&id=id&accname=guest&checksum=A62E00725A347D801D21B433C0B56A29
http://apsjournals.apsnet.org/doi/pdf/10.1094/MPMI-20-11-1376
https://www.researchgate.net/publication/5845646_Effect_of_plant_age_at_inoculation_on_expression_of_genetic_resistance_to_tomato_yellow_leaf_curl_virus
page 287 in: IRRI, 1969 The Virus Diseases of the Rice Plant: Proceedings of a Symposium at the International Rice Research Institute, April, 1967 International Rice Research Institute
http://www.pnas.org/content/98/9/4910.full
http://www.cabi.org/isc/datasheet/2747
https://www.ncbi.nlm.nih.gov/pubmed/15384488
Hoping this will be helpful
Regards
Prof. Houda Kawas
Article Effect of plant age at inoculation on expression of genetic ...
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