Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Highlighting the threat from current and near-future ozone pollution to clover in pasture
AU - Hewitt, Daniel
AU - Mills, G. E.
AU - Hayes, F.
AU - Wilkinson, Sally
AU - Davies, William John
PY - 2014/6
Y1 - 2014/6
N2 - 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.
AB - 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.
KW - Clover
KW - Nodulation
KW - Ozone
KW - Nitrogen fixation
KW - Pasture
KW - Background ozone
U2 - 10.1016/j.envpol.2014.02.033
DO - 10.1016/j.envpol.2014.02.033
M3 - Journal article
VL - 189
SP - 111
EP - 117
JO - Environmental Pollution
JF - Environmental Pollution
SN - 0269-7491
ER -