Manipulation of Light Spectrum for Crop Growth Regulation

Paul, Nandita; Moore, John P.

doi:10.17660/actahortic.2006.711.49

Cited by 5 publications

(16 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most previous studies have used laboratory filters such as cellulose diacetate or Teflon, which are transparent to solar UV radiation greater than approximately 290 nm, and certain clear polyester filters, which are opaque to UV‐B or the whole of the UV waveband. In our experiments, we have made use of newly available commercially produced polyethylene cladding films which have contrasting UV transmissions, as detailed in our previous study (Paul et al 2005). All these filters have PAR transmissions of 93–96% when new (Table 1), but contrasting UV transmission properties.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, UV‐B appears to affect multitrophic interactions, e.g. between host plant, herbivore and parasitoids attacking the herbivore (Foggo et al 2007) or between plants, pathogens and biocontrol agents (Paul and Moore 2005, Paul et al 2005). Thus, in considering the effects of changes in UV radiation in the biology of plant–herbivore or plant–pathogen interactions, it is necessary to look beyond simply plant responses to consider the diversity of UV effects of all the organisms involved.…”

Section: Introductionmentioning

confidence: 99%

“…For linear doses, UV sensitivity is simply a function of the slope of the dose response, and while this can clearly differ between species, estimates based on data from many studies (Newsham and Robinson 2009, Ballaré et al 2011) have suggested that an average plant response might be in the order of a 3% change in growth for a 10% change in UV weighted according to the most widely used plant action spectrum (PAS) (Caldwell et al 1986). However, there are also many examples of non‐linear relationships between UV dose and plant response and for microorganisms, highly non‐linear sigmoidal dose responses appear commonplace (Gunasekera et al 1997b, Paul 2000, Paul et al 2005). These sigmoidal responses show no significant response to low UV doses, presumed to be within the scope of an organism's innate protection and repair mechanisms, but a threshold dose at which the capacity for protection and repair is exceeded, and beyond which damage increases significantly with increasing dose.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ecological responses to UV radiation: interactions between the biological effects of UV on plants and on associated organisms

Paul

Moore

McPherson

et al. 2012

Physiologia Plantarum

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ecological responses to UV radiation: interactions between the biological effects of UV on plants and on associated organisms

Paul

Moore

McPherson

et al. 2012

Physiologia Plantarum

View full text Add to dashboard Cite

show abstract

“…; Rajapakse et al . ; Paul & Moore ; Lykas, Kittas & Katsoulas ). Large‐scale manipulation of spectral quality under field conditions to control dodder infestations will no doubt pose significant technical challenges.…”

Section: Discussionmentioning

confidence: 99%

“…Spectral manipulation techniques have previously been employed effectively for the control of other classes of pests and pathogens in greenhouses (Raviv & Antignus 2004;Nguyen et al 2009) and to control plant growth without the use of growth regulators (Decoteau et al 1988;Rajapakse et al 1999;Paul & Moore 2006;Lykas, Kittas & Katsoulas 2008). Large-scale manipulation of spectral quality under field conditions to control dodder infestations will no doubt pose significant technical challenges.…”

Section: Discussionmentioning

confidence: 99%

Manipulation of light spectral quality disrupts host location and attachment by parasitic plants in the genus Cuscuta

Johnson

Moraes

Mescher

2016

Journal of Applied Ecology

View full text Add to dashboard Cite

Science, ETH Z€ urich, Z€ urich 8092, Switzerland Summary 1. Parasitic plants in the genus Cuscuta (dodders) make their living by extracting resources from other plants. While relatively few dodder species are agricultural pests, those that are can be challenging to control, in part due to their intimate physical and physiological association with host plants. Consequently, dodders remain pervasive and economically damaging pests in a variety of crop systems. The development of improved management strategies would be facilitated by greater understanding of the ecological and environmental factors that influence the establishment and perpetuation of dodder infestations. 2. Light cues play an important role in dodder host location and attachment. To better understand the influence of light conditions on parasite ecology, and potential implications for management, we examined how manipulating the ratio of red to far-red wavelengths (R:FR), via both passive filtering of natural sunlight and active spectral manipulation using LEDs, affects host location and host attachment by two dodder species (C. campestris on tomato hosts and C. gronovii on jewelweed). 3. For both host-parasite combinations, host location and subsequent attachment by dodder parasites was dramatically reduced in high-R:FR environments compared to control conditions (with R:FR characteristic of sunlight) and low-R:FR conditions. Circumnutation by dodder seedlings was also significantly faster under high R:FR. 4. We observed short-term effects of high R:FR on the height and dry mass of tomato host plants (immediately following 7-day exposure), as well as changes in tomato volatile emissions. However, preliminary investigation of long-term effects on host plants suggests that short-term exposure to high R:FR (i.e. during the critical period when dodder seedlings emerge and attach to hosts) has little or no effect on host plant size or fruit yield at the time of harvest. 5. Synthesis and applications. Our findings suggest that spectral manipulation during the early stages of crop plant growth (e.g. via light-filtering row covers) may have significant potential to augment existing methods for managing or preventing dodder infestations in agricultural crops. We discuss potential obstacles to the realization of its potential, as well as next steps towards the development and optimization of spectral manipulation methods for use in agroecosystems.

show abstract

UV LEDs in horticulture: from biology to application

Wargent¹

2016

Acta Hortic.

View full text Add to dashboard Cite

Manipulation of Light Spectrum for Crop Growth Regulation

Cited by 5 publications

References 0 publications

Ecological responses to UV radiation: interactions between the biological effects of UV on plants and on associated organisms

Ecological responses to UV radiation: interactions between the biological effects of UV on plants and on associated organisms

Manipulation of light spectral quality disrupts host location and attachment by parasitic plants in the genus Cuscuta

UV LEDs in horticulture: from biology to application

Contact Info

Product

Resources

About