title: Physiological Response of Orchids to Mealybugs (Hemiptera: Pseudococcidae) Infestation.
abstract: The harmfulness of mealybugs resulting from sucking plant sap, secreting honeydew, and transmitting plant viruses can give them the status of serious pests. This study documents the influence of Pseudococcus maritimus (Ehrhorn) and Pseudococcus longispinus (Targioni Tozzetti) infestation on alterations in selected physiological parameters of Phalaenopsis x hybridum 'Innocence'. The condition of the cytoplasmic membranes was expressed as the value of thiobarbituric acid reactive substances. We have determined changes in the activities of catalase and guaiacol peroxidase and measured the following chlorophyll fluorescence parameters: maximum quantum yield of photosystem II (Fv/Fm), effective quantum yield (Y), photochemical quenching (qP), and nonphotochemical quenching (qN). The strongest physiological response of orchids was recorded in the initial period of mealybugs infestation. Prolonged insect feeding suppressed lipid peroxidation, peroxidase and catalase activity, as well as photosynthesis photochemistry. The pattern of changes was dependent on mealybug species. This indicated the complexity of the processes responsible for plant tolerance. Data generated in this study have provided a better understanding of the impact of two mealybug species infestation on Phalaenopsis and should be useful in developing pest management strategies.
authors: Department of Entomology, University of Life Sciences in Lublin, Leszczynskiego 7, 20-069 Lublin, Poland (katarzyna.kmiec@up.lublin.pl; izabela.kot@up.lublin.pl; katarzyna.golan@up.lublin.pl; edyta.drabik@up.lublin.pl; bozena.lagowska@up.lublin.pl).
authors: K
authors: K
authors: Kmiec
authors: Department of Entomology, University of Life Sciences in Lublin, Leszczynskiego 7, 20-069 Lublin, Poland (katarzyna.kmiec@up.lublin.pl; izabela.kot@up.lublin.pl; katarzyna.golan@up.lublin.pl; edyta.drabik@up.lublin.pl; bozena.lagowska@up.lublin.pl).
authors: I
authors: I
authors: Kot
authors: Department of Entomology, University of Life Sciences in Lublin, Leszczynskiego 7, 20-069 Lublin, Poland (katarzyna.kmiec@up.lublin.pl; izabela.kot@up.lublin.pl; katarzyna.golan@up.lublin.pl; edyta.drabik@up.lublin.pl; bozena.lagowska@up.lublin.pl).
authors: K
authors: K
authors: Golan
authors: Department of Entomology, University of Life Sciences in Lublin, Leszczynskiego 7, 20-069 Lublin, Poland (katarzyna.kmiec@up.lublin.pl; izabela.kot@up.lublin.pl; katarzyna.golan@up.lublin.pl; edyta.drabik@up.lublin.pl; bozena.lagowska@up.lublin.pl).
authors: E
authors: E
authors: Górska-Drabik
authors: Department of Entomology, University of Life Sciences in Lublin, Leszczynskiego 7, 20-069 Lublin, Poland (katarzyna.kmiec@up.lublin.pl; izabela.kot@up.lublin.pl; katarzyna.golan@up.lublin.pl; edyta.drabik@up.lublin.pl; bozena.lagowska@up.lublin.pl).
authors: B
authors: B
authors: Lagowska
authors: Department of Plant Physiology, University of Life Sciences in Lublin, Akademicka 15, 20-950 Lublin, Poland (katarzyna.rubinowska@up.lublin.pl).
authors: K
authors: K
authors: Rubinowska
authors: Department of General Ecology, University of Life Sciences in Lublin, Leszczynskiego 58, 20-069 Lublin, Poland (wladyslaw.michalek@up.lublin.pl).
authors: W
authors: W
authors: Michalek
mesh_terms: D000818:Animals; D000898:Antibiosis; D005260:Female; D006430:Hemiptera / Q000502:physiology*; D060434:Herbivory; D009758:Nymph; D029595:Orchidaceae / Q000502:physiology*
keywords: Pseudococcus longispinus; Pseudococcus maritimus; antioxidant; chlorophyll fluorescence; thiobarbituric acid reactive substance