Infestation of Broad Bean (Vicia faba) by the Green Stink Bug (Nezara viridula) Decreases Shoot Abscisic Acid Contents under Well-Watered and Drought Conditions

Frontiers in Plant Science

Gianandrea Salerno¹  Francesca Frati¹  Stefano Colazza²  Francesco Loreto³  Luisa Ederli⁴  Stefania Pasqualini⁴  Mauro Centritto⁵  Cecilia Brunetti⁵  Giovanni Marino⁵ 

[1] Department of Agricultural, Food and Environmental Sciences, University of PerugiaPerugia, Italy;Department of Agricultural, Food and Forest Sciences, University of PalermoPalermo, Italy;Department of Biology, Agriculture and Food Sciences, National Research Council of ItalyRome, Italy;Department of Chemistry, Biology and Biotechnology, University of PerugiaPerugia, Italy;Trees and Timber Institute, National Research Council of ItalySesto Fiorentino, Italy;

关键词: ABA;    hydrogen peroxide;    Nezara viridula;    photosynthesis;    salicylic acid;    Vicia faba;   

DOI  :  10.3389/fpls.2017.00959

来源: DOAJ

【 摘 要 】

The response of broad bean (Vicia faba) plants to water stress alone and in combination with green stink bug (Nezara viridula) infestation was investigated through measurement of: (1) leaf gas exchange; (2) plant hormone titres of abscisic acid (ABA) and its metabolites, and of salicylic acid (SA); and (3) hydrogen peroxide (H2O2) content. Furthermore, we evaluated the effects of experimentally water-stressed broad-bean plants on N. viridula performance in terms of adult host–plant preference, and nymph growth and survival. Water stress significantly reduced both photosynthesis (A) and stomatal conductance (gs), while infestation by the green stink bug had no effects on photosynthesis but significantly altered partitioning of ABA between roots and shoots. Leaf ABA was decreased and root ABA increased as a result of herbivore attack, under both well-watered and water-deprived conditions. Water stress significantly impacted on SA content in leaves, but not on H2O2. However, infestation of N. viridula greatly increased both SA and H2O2 contents in leaves and roots, which suggests that endogenous SA and H2O2 have roles in plant responses to herbivore infestation. No significant differences were seen for green stink bug choice between well-watered and water-stressed plants. However, for green stink bug nymphs, plant water stress promoted significantly lower weight increases and significantly higher mortality, which indicates that highly water-stressed host plants are less suitable for N. viridula infestation. In conclusion two important findings emerged: (i) association of water stress with herbivore infestation largely changes plant response in terms of phytohormone contents; but (ii) water stress does not affect the preference of the infesting insects, although their performance was impaired.

【 授权许可】

Unknown