Abstract Detail



Biogeography

Ritter, Matt [1], Johns, Jason [2], Yost, Jenn [3], NIcolle, Dean [4], Igic, Boris [5].

Worldwide hemisphere-dependent lean in Cook pines.

A tree's form is determined by the complex interactions of genetics and environmental stimuli (Braam 2005). Under most conditions, trees grow vertically in response to the opposing influences of light and gravity (Loehle 1986). In challenging environments, where competition for light or mechanical stress is intense, trees may grow in a non-vertical fashion (Braam 2005, Telewski 2006). Although the growth responses contributing to vertical growth have been studied for over 100 years, the mechanisms driving them remain only partly elucidated (Darwin and Darwin 1880, Sinnott 1952, Wyatt and Kiss 2013). We described a novel leaning growth habit in Araucaria columnaris (Cook pine), a conifer endemic to New Caledonia and cultivated throughout the world (Johns et al. 2017). Specifically, in a large sample of individuals from around the world, we demonstrate that the Cook pines' lean is non-random: trees in the northern hemisphere lean south, and those in the southern hemisphere lean north. Additionally, the magnitude of the lean is more pronounced at higher latitudes in both hemispheres. Our data and the pattern that we described elucidate the fact that plants are responding to their global environment in a way not yet fully understood. Braam, J. 2005. In touch: plant responses to mechanical stimuli. New Phytologist 165:373-389. Darwin, C., and F. Darwin. 1880. The power of movement in plants. Appleton, London, UK. Loehle, C. 1986. Phototropism of whole trees: effects of habitat and growth form. American Midland Naturalist 116:190-196. Sinnott, E. W. 1952. Reaction wood and the regulation of tree form. American Journal of Botany 39:69-78. Telewski, F. W. 2006. A unified hypothesis of mechanoperception in plants. American Journal of Botany 93:1466-1476. Wyatt, S. E., and J. Z. Kiss. 2013. Plant tropisms: From Darwin to the international space station. American Journal of Botany 100:1-3. Johns et al. 2017. Worldwide hemisphere-dependent lean in Cook pines. Ecology 98: 2482-2484.


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1 - Cal Poly, SLO, Biology Department, 1 Grand Ave., San Luis Obispo, CA, 93407, United States
2 - 4426 La Paloma Ave., Santa Barbara, CA, 93105, United States
3 - Cal Poly, SLO, Biology Department, 1 Grand Ave., San Luis Obispo, CA, 93401, USA
4 - Currency Creek Arboretum, PO Box 808, Melrose Park, SA, 5039, Australia
5 - University of Illinois at Chicago, Department of Biological Sciences, 840 West Taylor Street MC067, Chicago, IL, 60607, USA

Keywords:
tree form
Araucaria
phototropism
worldwide plant distribution
conifer.

Presentation Type: Oral Paper
Session: 4, Biogeography
Location: 105/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 10:15 AM
Number: 4009
Abstract ID:619
Candidate for Awards:None


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