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Atmospheric pCO2 impacts leaf structural and physiological traits in Quercus petraea seedlings.

Abstract：

MAIN CONCLUSION:Atmospheric p CO 2 impacts Quercus petraea biomass production and cell wall composition of the leaves in favor of cellulose at the expense of lignin, and enhances foliar non-structural carbohydrate levels and sucrose contents in a pCO 2 concentration-dependent manner. Sessile oak (Quercus petraea Liebl.) was grown for ca. half a year from seeds at ambient control (525 ppm), 750, 900, and 1000 ppm atmospheric pCO2 under controlled conditions. Increasing pCO2 enhanced biomass production, modified the cell wall composition of the leaves in favor of cellulose at the expense of lignin, and enhanced the foliar non-structural carbohydrate level, in particular the sucrose content; as well as total N content of leaves by increased levels of all major N fractions, i.e., soluble proteins, total amino acids, and structural N. The enhanced total amino acid level was largely due to 2-ketoglutarate and oxalo acetate-derived compounds. Increasing pCO2 alleviated oxidative stress in the leaves as indicated by reduced H2O2 contents. High in vitro glutathione reductase activity at reduced H2O2 contents suggests enhanced ROS scavenging, but increased lipid peroxidation may also have contributed, as indicated by a negative correlation between malone dialdehyde and H2O2 contents. Almost all these effects were at least partially reversed, when pCO2 exceeded 750 or 900 ppm. Apparently, the interaction of atmospheric pCO2 with leaf structural and physiological traits of Q. petraea seedlings is characterized by a dynamic response depending on the pCO2 level.

journal_name

Planta

journal_title

Planta

authors

Arab L,Seegmueller S,Kreuzwieser J,Eiblmeier M,Rennenberg H

doi

10.1007/s00425-018-3016-5

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

481-495

issue

2

eissn

0032-0935

issn

1432-2048

pii

10.1007/s00425-018-3016-5

journal_volume

249

pub_type

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