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

Authors
  • Hewitt, D K L1
  • Mills, G2
  • Hayes, F2
  • Wilkinson, S3
  • Davies, W3
  • 1 Centre for Ecology & Hydrology, Environment Centre Wales, Deinol Road, Bangor, Gwynedd LL57 2UW, UK; Lancaster University, Lancaster Environment Centre, Lancaster, Lancashire LA1 4YQ, UK. Electronic address: [email protected]
  • 2 Centre for Ecology & Hydrology, Environment Centre Wales, Deinol Road, Bangor, Gwynedd LL57 2UW, UK.
  • 3 Lancaster University, Lancaster Environment Centre, Lancaster, Lancashire LA1 4YQ, UK.
Type
Published Article
Journal
Environmental pollution (Barking, Essex : 1987)
Publication Date
Jun 01, 2014
Volume
189
Pages
111–117
Identifiers
DOI: 10.1016/j.envpol.2014.02.033
PMID: 24657604
Source
Medline
Keywords
License
Unknown

Abstract

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 modern 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.

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