Contrasting nonstructural carbohydrate dynamics of tropical tree seedlings under water deficit and variability

Michael J O'Brien, David F R P Burslem, Alexa Caduff, John Tay, Andy Hector

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Drought regimes can be characterized by the variability in the quantity of rainfall and the duration of rainless periods. However, most research on plant response to drought has ignored the impacts of rainfall variation, especially with regard to the influence of nonstructural carbohydrates (NSCs) in promoting drought resistance. To test the hypothesis that these components of drought differentially affect NSC dynamics and seedling resistance, we tracked NSC in plant tissues of tropical tree seedlings in response to manipulations of the volume and frequency of water applied. NSC concentrations decreased in woody tissues under infrequent-high watering but increased under no watering. A faster decline of growth relative to stomatal conductance in the no watering treatment was consistent with NSC accumulation as a result of an uncoupling of growth and photosynthesis, while usage of stored NSCs in woody tissues to maintain function may account for the NSC decline under infrequent-high watering. NSCs, and specifically stem NSCs, contributed to drought resistance under severe water deficits, while NSCs had a less clear role in drought resistance to variability in water availability. The contrasting response of NSCs to water variability and deficit indicates that unique processes support seedling resistance to these components of drought.

Original languageEnglish
Pages (from-to)1083-1094
Number of pages12
JournalNew Phytologist
Volume205
Issue number3
Early online date31 Oct 2014
DOIs
Publication statusPublished - Feb 2015

Keywords

  • climate change
  • drought resistance
  • nonstructural carbohydrates (NSCs)
  • plant–climate interactions
  • relative growth response
  • stomatal conductance
  • tropical forests

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