Header

UZH-Logo

Maintenance Infos

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


O'Brien, Michael J; Burslem, David F R P; Caduff, Alexa; Tay, John; Hector, Andy (2015). Contrasting nonstructural carbohydrate dynamics of tropical tree seedlings under water deficit and variability. New Phytologist, 205(3):1083-1094.

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.

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.

Statistics

Citations

15 citations in Web of Science®
15 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

42 downloads since deposited on 19 Mar 2015
24 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:climate change, drought resistance, nonstructural carbohydrates (NSCs), plant-climate interactions, relative growth response, stomatal conductance, tropical forests
Language:English
Date:February 2015
Deposited On:19 Mar 2015 06:38
Last Modified:05 Apr 2016 19:10
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:0028-646X
Additional Information:This is the accepted version of the following article: O'Brien, Michael J; Burslem, David F R P; Caduff, Alexa; Tay, John; Hector, Andy (2015). Contrasting nonstructural carbohydrate dynamics of tropical tree seedlings under water deficit and variability. New Phytologist, 205(3):1083-1094, which has been published in final form at DOI: 10.1111/nph.13134
Publisher DOI:https://doi.org/10.1111/nph.13134
PubMed ID:25358235

Download

Download PDF  'Contrasting nonstructural carbohydrate dynamics of tropical tree seedlings under water deficit and variability'.
Preview
Content: Accepted Version
Filetype: PDF
Size: 2MB
View at publisher