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Increased root growth in elevated CO2: a biophysical analysis of root cell elongation

Record type: Article

A biophysical analysis of root expansion was conducted in four chalk downland herbs (Sanguisorba minor Scop., Lotus corniculatus L., Anthyllis vul-neraria L. and Plantago media L.) exposed to either ambient or elevated CO2in controlled environment cabinets. Measurements of fine (F) and extra-fine (EF) root extension rate (RER), water relations, and cell wall tensiometric extensibility revealed differences in the diurnal pattern of root growth between species. After 35 d of exposure to elevated CO2, RER of both F and EF roots increased significantly in darkness and on illumination for S. minor, whilst for A. vulneraria (EF roots only) and L. corniculatus a significant increase occurred at night whereas for P. media a significant increase occurred during the day. Cells measured in the zone of elongation were longer in all species exposed to elevated CO2. Water potential ({Psi}), solute potential ({Psi}), turgor pressure (P), yield turgor (Y) and effective turgor (Pe) were measured by stress-relaxation of excised root tips placed in psychro-meters. Solute potentials decreased significantly for all species following exposure to elevated CO2. In S. minor and L. corniculatus, P and Pe, respectively, were higher in elevated CO2. No significant effects of CO2 on Y were observed (not shown). Root cell wall tensiometric extensibility, measured as % plasticity, increased in all species exposed to elevated CO2. These results suggest that root growth is enhanced following increased cell expansion and that increased P and cell wall tensiometric extensibility are both important for root growth in elevated CO2.

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Citation

Ferris, R. and Taylor, Gail (1994) Increased root growth in elevated CO2: a biophysical analysis of root cell elongation Journal of Experimental Botany, 45, (11), pp. 1603-1612.

More information

Published date: 1994

Identifiers

Local EPrints ID: 159899
URI: http://eprints.soton.ac.uk/id/eprint/159899
ISSN: 0022-0957
PURE UUID: 319f398d-22b1-4f11-b3a6-6f773c077928

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Date deposited: 08 Jul 2010 09:27
Last modified: 18 Jul 2017 12:36

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Contributors

Author: R. Ferris
Author: Gail Taylor

University divisions


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