Abstract
Solar ultraviolet (UV)-B radiation (280-315 nm) has a wide range of effects on terrestrial ecosystems, yet our understanding of how UV-B influences the complex interactions of plants with pest, pathogen and related microorganisms remains limited. Here, we report the results of a series of experiments in Lactuca sativa which aimed to characterize not only key plant responses to UV radiation in a field environment but also consequential effects for plant interactions with a sap-feeding insect, two model plant pathogens and phylloplane microorganism populations. Three spectrally modifying filters with contrasting UV transmissions were used to filter ambient sunlight, and when compared with our UV-inclusive filter, L. sativa plants grown in a zero UV-B environment showed significantly increased shoot fresh weight, reduced foliar pigment concentrations and suppressed population growth of green peach aphid (Myzus persicae). Plants grown under a filter which allowed partial transmission of UV-A radiation and negligible UV-B transmission showed increased density of leaf surface phylloplane microbes compared with the UV-inclusive treatment. Effects of UV treatment on the severity of two plant pathogens, Bremia lactucae and Botrytis cinerea, were complex as both the UV-inclusive and zero UV-B filters reduced the severity of pathogen persistence. These results are discussed with reference to known spectral responses of plants, insects and microorganisms, and contrasted with established fundamental responses of plants and other organisms to solar UV radiation, with particular emphasis on the need for future integration between different experimental approaches when investigating the effects of solar UV radiation.
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Claims 5
Claim · model-written summary
Lettuce plants grown under zero UV-B had significantly higher shoot fresh weight than under the UV-inclusive filter.
- Taxon
- L. sativa
Lactuca sativae0 - Treatment
- zero UV-B environmente0
- Outcome
- shoot fresh weighte0
- Direction
- increasede0
- Comparator
- UV-inclusive filtere0
- Setting
- zero UV-B environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when compared with our UV-inclusive filter, L. sativa plants grown in a zero UV-B environment showed significantly increased shoot fresh weight”
Claim · model-written summary
Lettuce plants grown under zero UV-B had significantly lower foliar pigment concentrations than under the UV-inclusive filter.
- Taxon
- L. sativaLactuca sativae0
- Treatment
- zero UV-B environmente0
- Outcome
- foliar pigment concentrationse0
- Direction
- reducede0
- Comparator
- UV-inclusive filtere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. sativa plants grown in a zero UV-B environment showed significantly increased shoot fresh weight, reduced foliar pigment concentrations”
e1“when compared with our UV-inclusive filter”
Claim · model-written summary
Zero UV-B suppressed population growth of green peach aphid on lettuce compared with the UV-inclusive filter.
- Taxon
- L. sativaLactuca sativae0
- Treatment
- zero UV-B environmente0
- Interactor
- green peach aphid (Myzus persicae)
Myzus persicaee0pest - Outcome
- population growth of green peach aphide0
- Direction
- suppressede0
- Comparator
- UV-inclusive filtere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. sativa plants grown in a zero UV-B environment showed significantly increased shoot fresh weight, reduced foliar pigment concentrations and suppressed population growth of green peach aphid (Myzus persicae)”
e1“when compared with our UV-inclusive filter”
Claim · model-written summary
Plants under a filter with partial UV-A and negligible UV-B transmission had higher density of leaf surface phylloplane microbes than under the UV-inclusive treatment.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- filter which allowed partial transmission of UV-A radiation and negligible UV-B transmissione1
- Outcome
- density of leaf surface phylloplane microbese1
- Direction
- increasede1
- Comparator
- UV-inclusive treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lactuca sativa”
e1“Plants grown under a filter which allowed partial transmission of UV-A radiation and negligible UV-B transmission showed increased density of leaf surface phylloplane microbes compared with the UV-inclusive treatment”
Claim · model-written summary
Effects of UV treatment on the severity of Bremia lactucae and Botrytis cinerea were complex: both the UV-inclusive and zero UV-B filters reduced pathogen persistence severity.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- UV treatmente1
- Interactor
- Bremia lactucae
.jpg?width=60)
Bremia lactucaee1pathogen - Second interactor
- Botrytis cinerea
Botrytis cinereae1pathogen - Outcome
- severity of pathogen persistencee1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Lactuca sativa”
e1“Effects of UV treatment on the severity of two plant pathogens, Bremia lactucae and Botrytis cinerea, were complex as both the UV-inclusive and zero UV-B filters reduced the severity of pathogen persistence”
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