Pinus sylvestris switches respiration substrates under shading but not during drought

2015-08 | journal article

Jump to:Cite & Linked | Documents & Media | Details | Version history

Cite this publication

​Pinus sylvestris switches respiration substrates under shading but not during drought​
Fischer, S.; Hanf, S.; Frosch, T.; Gleixner, G.; Popp, J.; Trumbore, S. & Hartmann, H. ​ (2015) 
The New Phytologist207(3) pp. 542​-550​.​ DOI: https://doi.org/10.1111/nph.13452 

Documents & Media

License

GRO License GRO License

Details

Authors
Fischer, Sarah; Hanf, Stefan; Frosch, Torsten; Gleixner, Gerd; Popp, Jürgen; Trumbore, Susan; Hartmann, Henrik 
Abstract
Reduced carbon (C) assimilation during prolonged drought forces trees to rely on stored C to maintain vital processes like respiration. It has been shown, however, that the use of carbohydrates, a major C storage pool and apparently the main respiratory substrate in plants, strongly declines with decreasing plant hydration. Yet no empirical evidence has been produced to what degree other C storage compounds like lipids and proteins may fuel respiration during drought. We exposed young scots pine trees to C limitation using either drought or shading and assessed respiratory substrate use by monitoring the respiratory quotient, δ(13) C of respired CO2 and concentrations of the major storage compounds, that is, carbohydrates, lipids and amino acids. Only shaded trees shifted from carbohydrate-dominated to lipid-dominated respiration and showed progressive carbohydrate depletion. In drought trees, the fraction of carbohydrates used in respiration did not decline but respiration rates were strongly reduced. The lower consumption and potentially allocation from other organs may have caused initial carbohydrate content to remain constant during the experiment. Our results suggest that respiratory substrates other than carbohydrates are used under carbohydrate limitation but not during drought. Thus, respiratory substrate shift cannot provide an efficient means to counterbalance C limitation under natural drought.
Issue Date
August-2015
Journal
The New Phytologist 
ISSN
0028-646X
eISSN
1469-8137
Language
English

Reference

Citations


Social Media