| Title: | Effects of amount and recurrence of leaf herbivory on the induction of direct and indirect defences in wild cotton |
| Author(s): | Abdala-Roberts L; Reyes-Hernandez M; Quijano-Medina T; Moreira X; Francisco M; Angulo DF; Parra-Tabla V; Virgen A; Rojas JC; |
| Address: | "Departamento de Ecologia Tropical, Campus de Ciencias Biologicas y Agropecuarias, Universidad Autonoma de Yucatan, Merida, Yucatan, Mexico. Mision Biologica de Galicia (MBG-CSIC), Pontevedra, Spain. Departamento de Agricultura, Sociedad y Ambiente, ECOSUR Unidad Tapachula, Tapachula, Chiapas, Mexico" |
| ISSN/ISBN: | 1438-8677 (Electronic) 1435-8603 (Linking) |
| Abstract: | "The induction of defences in response to herbivory is a key mechanism of plant resistance. While a number of studies have investigated the time course and magnitude of plant induction in response to a single event of herbivory, few have looked at the effects of recurrent herbivory. Furthermore, studies measuring the effects of the total amount and recurrence of herbivory on both direct and indirect plant defences are lacking. To address this gap, here we asked whether insect leaf herbivory induced changes in the amount and concentration of extrafloral nectar (an indirect defence) and concentration of leaf phenolic compounds (a direct defence) in wild cotton (Gossypium hirsutum). We conducted a greenhouse experiment where we tested single event or recurrent herbivory effects on defence induction by applying mechanical leaf damage and caterpillar (Spodoptera frugiperda) regurgitant. Single events of 25% and 50% leaf damage did not significantly influence extrafloral nectar production or concentration. Extrafloral nectar traits did, however, increase significantly relative to controls when plants were exposed to recurrent herbivory (two episodes of 25% damage). In contrast, phenolic compounds increased significantly in response to single events of leaf damage but not to recurrent damage. In addition, we found. that local induction of extrafloral nectar production was stronger than systemic induction, whereas the reverse pattern was observed for phenolics. Together, these results reveal seemingly inverse patterns of induction of direct and indirect defences in response to herbivory in wild cotton" |
| Keywords: | Animals Gossypium/*metabolism/*parasitology Herbivory Phenols/metabolism Plant Leaves/*metabolism/*parasitology Plant Nectar/metabolism Spodoptera/pathogenicity Extrafloral nectar induced defences phenolic compounds recurrent herbivory wild cotton; |
| Notes: | "MedlineAbdala-Roberts, L Reyes-Hernandez, M Quijano-Medina, T Moreira, X Francisco, M Angulo, D F Parra-Tabla, V Virgen, A Rojas, J C eng AGL2015-70748-R/Spanish National Research Grant/ CB-250925/Consejo Nacional de Ciencia y Tecnologia/ CONACYT/ England 2019/06/27 Plant Biol (Stuttg). 2019 Nov; 21(6):1063-1071. doi: 10.1111/plb.13022. Epub 2019 Jul 30" |
