Topic
Chrysolina
About: Chrysolina is a research topic. Over the lifetime, 129 publications have been published within this topic receiving 1301 citations.
Papers published on a yearly basis
Papers
TL;DR: Evidence indicates that the beetles do not sequester these steroid glycoside derivatives linked to a pentose from their host plants.
Abstract: The defensive secretions of some chrysomelid beetles belonging to the genera Chrysolina, Chrysochloa, and Dlochrysa contain complex mixtures of cardenolides. The spectral data for some of these compounds suggest that they are monohydroxylated digitoxigenin derivatives linked to a pentose (such as xylose or arabinose). Evidence indicates that the beetles do not sequester these steroid glycosides from their host plants.
78 citations
TL;DR: An in vitro detached assay was used to assess the effects of specialist and generalist herbivore damage on the levels of hypericins and hyperforin and found that Feeding by the specialist beetle or mechanical wounding caused little change in phytochemical levels in plant tissue, whereas the small amount of feeding by the generalists caused 30–100% increases in hypericin and hyper forin as compared to control levels.
Abstract: Plants respond to herbivore and pathogen attack by a variety of direct and indirect mechanisms that include the induction of secondary metabolites. The phytomedicinal plant Hypericum perforatum L. produces two different classes of secondary metabolites:hyperforins, a family of antimicrobial acylphloroglucinols; and hypericins, a family of phototoxic anthraquinones exhibiting antimicrobial, antiviral, and antiherbivore properties in vitro. To determine whether these compounds are part of the herbivore-specific inducible plant defense system, we used an in vitro detached assay to assess the effects of specialist and generalist herbivore damage on the levels of hypericins and hyperforin. Greenhouse-grown H. perforatum plant sections were challenged with the specialist, Chrysolina quadrigemina, or with one of the following generalist feeders: Spilosoma virginica, Spilosoma congrua,or Spodoptera exigua. Feeding by the specialist beetle or mechanical wounding caused little change in phytochemical levels in plant tissue, whereas the small amount of feeding by the generalists caused 30–100% increases in hypericins and hyperforin as compared to control levels. Although the leaf damage index of the specialist feeding was 2.7 times greater, C. quadrigemina had little effect on H. perforatum chemical defenses in response to feeding damage in comparison to generalist feeding.
63 citations
TL;DR: This paper reviews studies on adult Chrysomelid beetles which have provided insight into the role of phytochemicals as feeding attractants, stimulants, deterrents and host-recognition factors in general.
48 citations
TL;DR: Data collected between 1981 and 1987 on an infestation of St John's wort Hypericum perforatum and its biological control agent in eucalypt forest that was burnt twice during the study period indicates that the compatibility of biological control with existing management strategies must be considered when it is proposed as an option for the control of invasive weeds in protected natural areas.
48 citations
Journal Article•
TL;DR: For the first time it is reported that a phytophagous insect is able to complete its entire life cycle for several generations feeding exclusively on leaves of a hyperaccumulating plant.
Abstract: One of the explanations given for nickel hyperaccumulation by plants is a pathogen/herbivore defence hypothesis. Some insects, however, have adapted to such an unusual phenomenon and feed on plants with a high nickel content. During field studies at Agnes Mine (Mpumalanga Province, South Africa), five phytophagous beetle species were collected on the leaves of the Ni-hyperaccu- mulating plant, Berkheya coddii Roessl. (Asteraceae), a serpen- tine-endemic. These are: Chrysolina pardalina (Fabricius) (family: Chrysomelidae), Listroderes costirostris Schoenherr, Brachy- trachelus pseudopatrinus Oberprieler and two Holcolaccus species (family: Curculionidae). Chrysolina pardalina exhibited host preferences, feeding exclusively on leaves of B. coddii for four generations. For the first time it is reported that a phytophagous insect is able to complete its entire life cycle for several generations feeding exclusively on leaves of a hyperaccumulating plant. This insect may have practical application as a weed control agent.
46 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 4 |
| 2020 | 2 |
| 2019 | 1 |
| 2018 | 1 |
| 2017 | 1 |
| 2016 | 1 |