Lower photorespiration in elevated CO2 reduces leaf N concentrations in mature Eucalyptus trees in the field

Global Change Biology
Agnieszka Wujeska-KlauseDavid S Ellsworth

Abstract

Rising atmospheric CO2 concentrations is expected to stimulate photosynthesis and carbohydrate production, while inhibiting photorespiration. By contrast, nitrogen (N) concentrations in leaves generally tend to decline under elevated CO2 (eCO2 ), which may reduce the magnitude of photosynthetic enhancement. We tested two hypotheses as to why leaf N is reduced under eCO2 : (a) A "dilution effect" caused by increased concentration of leaf carbohydrates; and (b) inhibited nitrate assimilation caused by reduced supply of reductant from photorespiration under eCO2 . This second hypothesis is fully tested in the field for the first time here, using tall trees of a mature Eucalyptus forest exposed to Free-Air CO2 Enrichment (EucFACE) for five years. Fully expanded young and mature leaves were both measured for net photosynthesis, photorespiration, total leaf N, nitrate ( N O 3 - ) concentrations, carbohydrates and N O 3 - reductase activity to test these hypotheses. Foliar N concentrations declined by 8% under eCO2 in new leaves, while the N O 3 - fraction and total carbohydrate concentrations remained unchanged by CO2 treatment for either new or mature leaves. Photorespiration decreased 31% under eCO2 supplying less...Continue Reading

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Citations

Feb 22, 2021·Tree Physiology·Angela C BurnettAlistair Rogers
May 11, 2021·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Namraj Dhami, Christopher Ian Cazzonelli
May 26, 2021·Journal of Hazardous Materials·Hamada AbdElgawadWalid Abuelsoud

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