Leaf day respiration: low CO2 flux but high significance for metabolism and carbon balance

摘要: Contents   'Summary' 986 I. 'Introduction' 987 II. 'Pioneering metabolic studies of day respiration with 14C' 987 III. 'Metabolic flux pattern respiration' 988 IV. 'Significance for leaf N assimilation' 991 V. 'Significance gas exchange' 992 VI. 'Is influenced by CO2 mole fraction?' 995 VII. 'Significance at the plant and ecosystem levels' 997 VIII. 'Conclusions perspectives' 998   References 998 Summary It has been 75 yr since respiratory metabolism in light (day respiration) was identified as a low-flux pathway that accompanies photosynthesis. In principle, it provides carbon backbones nitrogen assimilation evolves thus impacts on balances. However, long time, uncertainties have remained to whether techniques used measure efflux were valid responded environmental gaseous conditions. past few years, significant advances made using isotopes, ‘omics’ analyses surveys rates mesocosms or ecosystems. There is substantial evidence should be viewed highly dynamic interacts photosynthesis photorespiration responds atmospheric fraction. The view constant and/or negligible parameter net exchange now outdated regarded central actor carbon-use efficiency.