Adaptational changes in white clover populations selected under marginal conditions

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dc.contributor.author Dalmannsdottir, S.
dc.contributor.author Helgadottir, Aslaug
dc.contributor.author Collins, Rosemary P.
dc.date.accessioned 2009-11-10T08:43:40Z
dc.date.available 2009-11-10T08:43:40Z
dc.date.issued 2009-11-10
dc.identifier.citation Dalmannsdottir , S , Helgadottir , A & Collins , R P 2009 , ' Adaptational changes in white clover populations selected under marginal conditions ' mixture with Lolium perenne L.: a model approach to plant-environment interactions. Annals of Botany , pp. 771-780 . en
dc.identifier.issn 0305-7364
dc.identifier.other PURE: 136419
dc.identifier.other dspace: 2160/3461
dc.identifier.uri http://hdl.handle.net/2160/3461
dc.description Helgadottir, A., Dalmannsdottir, S., Collins, R. P. (2001). Adaptational changes in white clover populations selected under marginal conditions. Annals of Botany, 88, (Special Issue), 771-780. en
dc.description.abstract To extend the cultivation of white clover into the marginal areas of northern Europe it is important to identify morphological and physiological characters of adaptive value. These can form the basis of selection criteria for genetic improvement. The objectives of this study were to (1) characterize the morphology of survivor populations of the white clover cultivars AberHerald and Undrom selected under Icelandic conditions; (2) investigate the growth response of selected populations in simulated spring temperatures; and (3) study how these responses affected persistence and production potential of the populations when grown under field conditions in Iceland. Results showed that natural selection had led to morphological changes in the AberHerald survivor populations in the direction of the morphology of plants adapted to the northern, marginal environment. Results obtained under simulated spring temperatures also indicated a selection for genotypes that maintained their leaf production potential. In contrast, selection in Undrom occurred for improved general efficiency and competitive ability rather than for improved survival of the harsh winter climate. The different responses of the two cultivars may partly reflect the fact that AberHerald survivors were selected after only one winter but Undrom survivors were selected after three growing seasons in experimental plots. The observed morphological changes in AberHerald were not sufficient to improve persistence when tested under field conditions. Undrom survivors, on the other hand, suffered less winter damage and showed greater production potential over the following growing season than the original population. Implications of the results for breeding white clover for marginal areas are discussed. en
dc.format.extent 10 en
dc.language.iso eng
dc.relation.ispartof mixture with Lolium perenne L.: a model approach to plant-environment interactions. Annals of Botany en
dc.title Adaptational changes in white clover populations selected under marginal conditions en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


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