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Non-photosynthetic mechanisms of growth reduction in pea (Pisum sativum L.) exposed to UV-B radiation

Gonzalez-Cuesta, Raquel and Mepsted, R. and Wellburn, Alan and Paul, Nigel (1998) Non-photosynthetic mechanisms of growth reduction in pea (Pisum sativum L.) exposed to UV-B radiation. Plant, Cell and Environment, 21 (1). pp. 23-32. ISSN 0140-7791

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Abstract

Pisum sativum cv. Guido grown under controlled environment conditions was exposed to either low or high UV-B radiation (2·2 or 9·9 kJ m–2 d–1 plant-weighted UV-B, respectively). Low or high UV-B was maintained throughout growth (LL and HH treatments, respectively) or plants were transferred between treatments when 22 d old (giving LH and HL treatments). High UV-B significantly reduced plant dry weight and significantly altered plant morphology. The growth and morphology of plants transferred from low to high UV-B were little affected, when compared with those of LL plants. By contrast, plants moved from high to low UV-B showed marked increases in growth when compared with HH plants. This contrast between HL and LH appeared to be related to the effect of UV-B on plant development. Exposure to high UV-B throughout development consistently reduced leaf areas. In fully expanded leaves there was no significant UV-B effect on cell area and reduced leaf area could be attributed to reduced cell number, suggesting effects on leaf primordia. Further reductions in the leaf area of younger leaves were the result of the slower development rate of plants grown at high UV-B, which also resulted in significant reductions in leaf number.

Item Type: Article
Journal or Publication Title: Plant, Cell and Environment
Uncontrolled Keywords: Pisum sativum ; cell area/number ; chlorophyll fluorescence;
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 51001
Deposited By: ep_importer_pure
Deposited On: 11 Nov 2011 10:58
Refereed?: Yes
Published?: Published
Last Modified: 22 Feb 2013 09:00
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/51001

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