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Elevated CO2, water relations and biophysics of leaf extension in four chalk grassland herbs

Elevated CO2, water relations and biophysics of leaf extension in four chalk grassland herbs
Elevated CO2, water relations and biophysics of leaf extension in four chalk grassland herbs
Diurnal measurements of leaf or leaflet, extension, water relations and cell wall extensibility (ø) were made on young growing leaves of four chalk downland herbs (Sanguisorba minor Scop., Lotus corniculatus L., Anthyllis vulneraria L. and Plantago media L.) growing in controlled environment cabinets and exposed to either ambient or elevated CO2. This study revealed differences in that effect of CO2 and the- control of leaf growth between the four species. Leaf extension rate (LER) increased significantly at night (average over 8 h) in elevated C02 for S. minor A. vulneraria and P. Media with a significant increase over the first 4h of darkness for S. minor, L, corniculatus and P. media, whilst for S. minor and P. media average day-time LER (over 16 h) also increased significantly in elevated CO2, as compared with ambient CO2. Water potential (?pS), solute potential (?pS), turgor pressure (P), yield turgor (Y) and the effective turgor for growth (Pe) were measured using psychrometers. Bollrte potentials of s, minor, A. vulneraria and P. media decreased significantly following exposure to elevated co2 with a Significant reduction in ?pS, during the day in A. Vulneraria. Turgor pressure increased significantly in elevated CO2 as compared with ambient CO2 in A. vulneraria but there was no effect of elevated CO2 on P in the uther species. effects of CO2 on ?pS; or ?pS; were observed, Leaf cell wall extensibility (ø) increased significantly in leaves of V. minor, L. corniculatus and P. exposed to elevated Co2. whereas in A. vulneraria, there was no effect of CO2 on extensibility.

These results suggest that the mechanism by which elevated CO2 promotes leaf growth differs between species arisce in S. minor, L. corniculatus, and p media. CO2 through an influence on cell wall properties, whist in A vulneraria higher values of P explain that increased leaf growth in elevated CO2 for this species.
0028-646X
297
Ferris, Rachel
f2e7c7a9-8dbe-4196-9b49-f06525d45514
Taylor, Gail
f3851db9-d37c-4c36-8663-e5c2cb03e171
Ferris, Rachel
f2e7c7a9-8dbe-4196-9b49-f06525d45514
Taylor, Gail
f3851db9-d37c-4c36-8663-e5c2cb03e171

Ferris, Rachel and Taylor, Gail (1994) Elevated CO2, water relations and biophysics of leaf extension in four chalk grassland herbs. New Phytologist, 127 (2), 297. (doi:10.1111/j.1469-8137.1994.tb04280.x).

Record type: Article

Abstract

Diurnal measurements of leaf or leaflet, extension, water relations and cell wall extensibility (ø) were made on young growing leaves of four chalk downland herbs (Sanguisorba minor Scop., Lotus corniculatus L., Anthyllis vulneraria L. and Plantago media L.) growing in controlled environment cabinets and exposed to either ambient or elevated CO2. This study revealed differences in that effect of CO2 and the- control of leaf growth between the four species. Leaf extension rate (LER) increased significantly at night (average over 8 h) in elevated C02 for S. minor A. vulneraria and P. Media with a significant increase over the first 4h of darkness for S. minor, L, corniculatus and P. media, whilst for S. minor and P. media average day-time LER (over 16 h) also increased significantly in elevated CO2, as compared with ambient CO2. Water potential (?pS), solute potential (?pS), turgor pressure (P), yield turgor (Y) and the effective turgor for growth (Pe) were measured using psychrometers. Bollrte potentials of s, minor, A. vulneraria and P. media decreased significantly following exposure to elevated co2 with a Significant reduction in ?pS, during the day in A. Vulneraria. Turgor pressure increased significantly in elevated CO2 as compared with ambient CO2 in A. vulneraria but there was no effect of elevated CO2 on P in the uther species. effects of CO2 on ?pS; or ?pS; were observed, Leaf cell wall extensibility (ø) increased significantly in leaves of V. minor, L. corniculatus and P. exposed to elevated Co2. whereas in A. vulneraria, there was no effect of CO2 on extensibility.

These results suggest that the mechanism by which elevated CO2 promotes leaf growth differs between species arisce in S. minor, L. corniculatus, and p media. CO2 through an influence on cell wall properties, whist in A vulneraria higher values of P explain that increased leaf growth in elevated CO2 for this species.

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Published date: 1994

Identifiers

Local EPrints ID: 159903
URI: https://eprints.soton.ac.uk/id/eprint/159903
ISSN: 0028-646X
PURE UUID: 30f0331a-6ef4-45fa-8b02-9aed9f51538d
ORCID for Gail Taylor: ORCID iD orcid.org/0000-0001-8470-6390

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Date deposited: 08 Jul 2010 09:02
Last modified: 25 May 2019 00:36

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Author: Rachel Ferris
Author: Gail Taylor ORCID iD

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