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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Does carbon storage confer waterlogging tolerance? Evidence from four evergreen species of a temperate rainforest

M. Delgado A B C D , A. Zúñiga-Feest A D G and F. I. Piper E F
+ Author Affiliations
- Author Affiliations

A Laboratorio de Biología Vegetal, Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile (UACh), Valdivia, Chile.

B Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus (BIOREN), Universidad de La Frontera, Temuco, Chile.

C Departamento de Ciencias Químicas y Recursos Naturales, Facultad de Ingeniería y Ciencias. Center of Plant, Soil Interaction, Universidad de la Frontera, Temuco, Chile.

D Centro de Investigaciones en Suelos Volcánicos (CISVo), UACh.

E Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Moraleda 16, Coyhaique, Chile.

F Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile.

G Corresponding author. Email: alejandrazunigafeest@gmail.com

Australian Journal of Botany 66(1) 74-84 https://doi.org/10.1071/BT17104
Submitted: 8 June 2017  Accepted: 13 December 2017   Published: 8 February 2018

Abstract

Deep shade and waterlogging are two common stressors affecting seedling performance in the understorey of evergreen rainforests. It has been hypothesised that high levels of carbon storage confer shade- and waterlogging tolerances by preventing carbon limitation under such stresses. Whether the tolerance to both stresses is positively or negatively related remains unclear. To explore the role of carbon storage in the relationships of waterlogging and shade tolerance, we investigated the responses to waterlogging and the levels of carbon storage in two species pairs with contrasting shade tolerance: Embothrium coccineum J.R.Forst. & G.Forst. and Gevuina avellana Mol. (Proteaceae) and Nothofagus dombeyi (Mirb.) Oerst. and Nothofagus nitida (Phil.) Krasser (Nothofagaceae). We subjected seedlings to waterlogging or control conditions for 30 days and evaluated survival, relative growth rate (RGR), biomass distribution, leaf chlorophyll fluorescence (Fv/Fm), and concentrations of total soluble sugars, starch and non-structural carbohydrates in different plant tissues. Waterlogging reduced survival, Fv/Fm and RGR in all species; however, the magnitude of reduction of Fv/Fm and RGR was significantly higher in the shade-intolerant species than in their shade-tolerant counterparts. In general, shade-intolerant species had significantly higher non-structural carbohydrate concentrations in waterlogging than in control conditions. By contrast, shade-tolerant species had similar non-structural carbohydrate concentrations under both conditions. Our results indicate that relatively shade-tolerant species performed better under waterlogging. A reduction in non-structural carbohydrates under waterlogging was not observed in any of studied species; rather, shade-intolerant species exhibited non-structural carbohydrate accumulation suggesting that carbon storage does not confer waterlogging tolerance in these species.

Additional keywords: carbon limitation, climate change, cluster roots, flooding, non-structural carbohydrates, swamp forests, Valdivian rainforest.


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