| Title: | Herbivory and Attenuated UV Radiation Affect Volatile Emissions of the Invasive Weed Calluna vulgaris |
| Author(s): | Effah E; Barrett DP; Peterson PG; Wargent JJ; Potter MA; Holopainen JK; Clavijo McCormick A; |
| Address: | "School of Agriculture and Environment, Massey University, Tennent Drive, Palmerston North 4474, New Zealand. Manaaki Whenua - Landcare Research, Riddet Road, Massey University, Palmerston North 4474, New Zealand. Department of Environmental and Biological Sciences, University of Eastern Finland, Yliopistonranta 1 E, FI-70210 Kuopio, Finland" |
| DOI: | 10.3390/molecules25143200 |
| ISSN/ISBN: | 1420-3049 (Electronic) 1420-3049 (Linking) |
| Abstract: | "Calluna vulgaris (heather) is an aggressive invasive weed on the Central Plateau, North Is., New Zealand (NZ), where it encounters different environmental factors compared to its native range in Europe, such as high ultraviolet radiation (UV) and a lack of specialist herbivores. The specialist herbivore Lochmaea suturalis (heather beetle) was introduced from the United Kingdom (UK) in 1996 as a biocontrol agent to manage this invasive weed. Like other plant invaders, a novel environment may be challenging for heather as it adjusts to its new conditions. This process of 'adjustment' involves morphological and physiological changes often linked to phenotypic plasticity. The biochemical responses of exotic plants to environmental variables in their invaded range is poorly understood. The production and release of volatile organic compounds (VOCs) is essential to plant communication and highly susceptible to environmental change. This study therefore aimed to explore the VOC emissions of heather in response to different levels of UV exposure, and to feeding damage by L. suturalis. Using tunnel houses clad with UV-selective filters, we measured VOCs produced by heather under NZ ambient, 20% attenuated, and 95% attenuated solar UV treatments. We also compared VOC emissions in the field at adjacent sites where L. suturalis was present or absent. Volatiles produced by the same target heather plants were measured at four different times in the spring and summer of 2018-2019, reflecting variations in beetle's abundance, feeding stage and plant phenology. Heather plants under 95% attenuated UV produced significantly higher amounts of (E)-beta-farnesene, decanal, benzaldehyde, and benzeneacetaldehyde compared to 25% attenuated and ambient UV radiation. We also found significant differences in volatiles produced by heather plants in beetle-present versus beetle-absent sites on most sampling occasions. We also recorded a lower number of generalist herbivores on heather at sites where L. suturalis was present. Interactions between invasive plants, a novel environment, and the native communities they invade, are discussed" |
| Keywords: | "Animals Biological Control Agents Calluna/*metabolism/*radiation effects Coleoptera *Herbivory New Zealand Plant Weeds/*metabolism/*radiation effects Stress, Physiological Ultraviolet Rays Volatile Organic Compounds/*metabolism biocontrol agents heather b;" |
| Notes: | "MedlineEffah, Evans Barrett, D Paul Peterson, Paul G Wargent, Jason J Potter, Murray A Holopainen, Jarmo K Clavijo McCormick, Andrea eng Doctoral Scholarship and Massey University Research Funds/Massey University/ Switzerland 2020/07/17 Molecules. 2020 Jul 13; 25(14):3200. doi: 10.3390/molecules25143200" |
