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Relative growth rates of vines and shrubs of western poison oak, Toxicodendron diversilobum (Anacardiaceae)

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  • Because of different mechanical constraints on vines and self-supporting plants, vines are thought to differ from trees and shrubs in a variety of their growth characteristics. I tested the hypotheses that vines grow faster than shrubs and that supported shoots have delayed leaf expansion relative to stem elongation, using western poison oak, Toxicodendron diversilobum (T. & G. ) Greene, a plant that grows as a vine when externally supported but otherwise as a shrub. In the field, supported shoots (vines) had significantly higher aboveground biomass and relative growth rates than did their paired unsupported shoots (shrubs) growing nearby. This was not due to differences in leaf phenology, but may have resulted from vines growing into more favorable habitats for growth. in contrast, whereas 2-yr-old cloned plants in a comon garden differend in their stem and internode lengths, they had the same aboveground dry weight, proportion of dry weight that was leaf, and relative rate of increase in primary stem length whether grown with stakes (vines) or without stakes (shrubs). These results suggest that there is no inherent requirement of vines to grow faster than shrubs. As hypothesized, leaf elongation was more delayed relative to stem elongation in staked than unstaked individuals in 19 paired plants (each pair cloned from a different source plant). Thus, physical cues resulting from the presence of support can alter the plant's spatial and temporal paterns of develoment, but do not necessarily dictate the quantity of biomass that will be produced.
  • Keywords: liana, plant biomechanics, Rhus diversilobum, biomass allocation
  • Keywords: liana, plant biomechanics, Rhus diversilobum, biomass allocation
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  • Gartner, B. L. 1991. Relative growth rates of vines and shrubs of western poison oak, Toxicodendron diversilobum (Anacardiaceae). American Journal of Botany 10:1345-1353.
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  • 78
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  • 10
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