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Highlighting the threat from current and near-future ozone pollution to clover in pasture

Hewitt, D.K.L.; Mills, G.; Hayes, F.; Wilkinson, S.; Davies, W.. 2014 Highlighting the threat from current and near-future ozone pollution to clover in pasture. Environmental Pollution, 189. 111-117. 10.1016/j.envpol.2014.02.033

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Abstract/Summary

Globally, the legume-rhizobia symbiosis, contained within specialised organs called root nodules, is thought to add at least 30 Tg N annually to agricultural land. The growth and functioning of a moderncurrent white clover (Trifolium repens cv. Crusader) and red clover (T. pratense cv. Merviot) cultivar were investigated in current and future ozone scenarios in solardomes. Both cultivars developed leaf injury and had significant reductions in root biomass and root nodule number in response to ozone, with Crusader also displaying a reduced size and mass of nodules. In-situ measurements of N-fixation in Crusader by acetylene reduction assay revealed reduced N-fixation rates in a future scenario with an increased background and moderate peaks of ozone. The implications for the sustainability of temperate pasture are discussed.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.envpol.2014.02.033
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry
CEH Sections: Emmett
ISSN: 0269-7491
Additional Keywords: clover, nodulation, ozone, nitrogen, fixation, pasture, background ozone
NORA Subject Terms: Ecology and Environment
Agriculture and Soil Science
Atmospheric Sciences
Biology and Microbiology
Botany
Date made live: 25 Mar 2014 14:25 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/505787

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