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- Title
Indirect effects of insect herbivory on leaf gas exchange in soybean.
- Authors
Aldea, Mihai; Hamilton, Jason G.; Resti, Joseph P.; Angerl, Arthur R.; Berenbaum, May R.; Delucia, Evan H.
- Abstract
Herbivory can affect plant carbon gain directly by removing photosynthetic leaf tissue and indirectly by inducing the production of costly defensive compounds or disrupting the movement of water and nutrients. The indirect effects of herbivory on carbon and water fluxes of soybean leaves were investigated using gas exchange, chlorophyll fluorescence and thermal imaging. Herbivory byPopillia japonicaandHelicoverpa zea(Boddie) caused a 20–90% increase in transpiration from soybean leaflets without affecting carbon assimilation rates or photosynthetic efficiency (ΦPSII). Mechanical damage to interveinal tissue increased transpiration up to 150%. The spatial pattern of leaf temperature indicated that water loss occurred from injuries to the cuticle as well as from cut edges. A fluorescent tracer (sulforhodamine G) indicated that water evaporated from the apoplast approximately 100 µm away from the cut edges of damaged leaves. The rate of water loss from damaged leaves remained significantly higher than from control leaves for 6 d, during which time they lost 45% more water than control leaves (0.72 mol H2O per cm of damaged perimeter). Profligate water loss through the perimeter of damaged tissue indicates that herbivory may exacerbate water stress of soybeans under field conditions.
- Subjects
SOYBEAN; PHOTOSYNTHESIS; GAS exchange in plants; JAPANESE beetle; CHLOROPHYLL; PLANT transpiration
- Publication
Plant, Cell & Environment, 2005, Vol 28, Issue 3, p402
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.2005.01279.x