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More carbohydrates make trees more resistant to drought

Date:
June 30, 2014
Source:
University of Zurich
Summary:
How well tropical trees weather periods of drought depends on the carbohydrates stored, as revealed by a novel experiment conducted by an international team of researchers. The findings are extremely important for assessing the resistance of tropical forests to climate change and reforestation.

Malula Field Station in Malaysia: The experiments are conducted under controlled conditions in the large, black cubes. The installations are large enough to be able to grow the tree saplings unrestrictedly.
Credit: Michael O'Brien/UZH

How well tropical trees weather periods of drought depends on the carbohydrates stored, as revealed by a novel experiment conducted by an international team of researchers headed by ecologists from the University of Zurich in contribution to the University Research Priority Program on "Global Change and Biodiversity." The findings are extremely important for assessing the resistance of tropical forests to climate change and reforestation.

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Water is the limiting factor for many plants and trees. Consequently, there are grave concerns that the rainfall patterns altered by climate change could trigger a forest decline on a global scale. According to climate researchers, Switzerland is also affected: The climate models even project hotter and drier summers for this country. An international research team headed by Michael O'Brien, an ecologist at the University of Zurich, is now studying which factors govern the resistance of tropical trees to periods of drought. As the scientists reveal in their study published in Nature Climate Change, stored carbohydrates play a key role in the resilience of the individual plant.

1,400 saplings of ten species monitored

While stored starch and soluble sugar in plant tissues were thought to influence the resistance and resilience of trees positively during periods of drought, this supposition had not been proven. O'Brien and his team planted 1,400 saplings of ten different tropical tree species in Malaysia and devised a novel experiment to manipulate the carbohydrates stored and observe their reaction.

The researchers increased or decreased the concentration of stored carbohydrates and exposed the seedlings to an artificial drought period. It became clear that young trees with more stored carbohydrates were able to maintain the vital water content in the stem for longer than those with fewer stored carbohydrates. "The better drought resistance and thus the greater chance of surviving a period of drought evidently depends on the quantity of carbohydrates stored," concludes O'Brien.

Carbohydrate content different in every tree species

According to the scientists, the ability to store carbohydrates varies both within and between species: "As different trees display a different mortality due to aridity, the impact of a forest decline triggered by climate change is cushioned," O'Brien is convinced. These new insights are also significant for reforestation: The planting of species that store more carbohydrates can be favored to boost the forests' resistance to the drier climates predicted by the climate change models.


Story Source:

The above story is based on materials provided by University of Zurich. Note: Materials may be edited for content and length.


Journal Reference:

  1. Michael J. O’Brien, Sebastian Leuzinger, Christopher D. Philipson, John Tay, Andy Hector. Drought survival of tropical tree seedlings enhanced by non-structural carbohydrate levels. Nature Climate Change, 2014; DOI: 10.1038/nclimate2281

Cite This Page:

University of Zurich. "More carbohydrates make trees more resistant to drought." ScienceDaily. ScienceDaily, 30 June 2014. <www.sciencedaily.com/releases/2014/06/140630093637.htm>.
University of Zurich. (2014, June 30). More carbohydrates make trees more resistant to drought. ScienceDaily. Retrieved November 23, 2014 from www.sciencedaily.com/releases/2014/06/140630093637.htm
University of Zurich. "More carbohydrates make trees more resistant to drought." ScienceDaily. www.sciencedaily.com/releases/2014/06/140630093637.htm (accessed November 23, 2014).

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