Premium
Leaf day respiration: low CO 2 flux but high significance for metabolism and carbon balance
Author(s) -
Tcherkez Guillaume,
Gauthier Paul,
Buckley Thomas N.,
Busch Florian A.,
Barbour Margaret M.,
Bruhn Dan,
Heskel Mary A.,
Gong Xiao Ying,
Crous Kristine Y.,
Griffin Kevin,
Way Danielle,
Turnbull Matthew,
Adams Mark A.,
Atkin Owen K.,
Farquhar Graham D.,
Cornic Gabriel
Publication year - 2017
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.14816
Subject(s) - respiration , photosynthesis , photorespiration , metabolism , carbon cycle , carbon dioxide , flux (metallurgy) , cellular respiration , chemistry , botany , ecosystem , biology , zoology , ecology , biochemistry , organic chemistry
Summary It has been 75 yr since leaf respiratory metabolism in the light (day respiration) was identified as a low‐flux metabolic pathway that accompanies photosynthesis. In principle, it provides carbon backbones for nitrogen assimilation and evolves CO 2 and thus impacts on plant carbon and nitrogen balances. However, for a long time, uncertainties have remained as to whether techniques used to measure day respiratory efflux were valid and whether day respiration responded to environmental gaseous conditions. In the past few years, significant advances have been made using carbon isotopes, ‘omics’ analyses and surveys of respiration rates in mesocosms or ecosystems. There is substantial evidence that day respiration should be viewed as a highly dynamic metabolic pathway that interacts with photosynthesis and photorespiration and responds to atmospheric CO 2 mole fraction. The view of leaf day respiration as a constant and/or negligible parameter of net carbon exchange is now outdated and it should now be regarded as a central actor of plant carbon‐use efficiency.ContentsSummary 986 I. Introduction 987 II. Pioneering metabolic studies of day respiration with 14 C 987 III. Metabolic flux pattern of day respiration 988 IV. Significance of day respiration for leaf N assimilation 991 V. Significance of day respiration for leaf gas exchange 992 VI. Is day respiration influenced by CO 2 mole fraction? 995 VII. Significance of day respiration at the plant and ecosystem levels 997 VIII. Conclusions and perspectives 998References 998