Show simple item record Ougham, Helen J. Tomos, A. D. Farrell, A. D. 2009-07-23T11:26:48Z 2009-07-23T11:26:48Z 2006-04-28
dc.identifier.citation Ougham , H J , Tomos , A D & Farrell , A D 2006 , ' The effect of gibberellic acid on the response of leaf extension to low temperature ' Plant, Cell and Environment , pp. 1329-1337 . en
dc.identifier.issn 1365-3040
dc.identifier.other PURE: 113680
dc.identifier.other PURE UUID: 2fe710d2-1cd6-4fbf-9405-f86701ec4d80
dc.identifier.other dspace: 2160/2735
dc.description Farrell, A. D., Ougham, H. J., Tomos, A. D. (2006). The effect of gibberellic acid on the response of leaf extension to low temperature. Plant Cell and Environment, 29, (7), 1329-1337. RAE2008 en
dc.description.abstract The effect of cooling on leaf extension rate (LER) and on relative elemental growth rate (REGR) was measured in both gibberellic acid (GA)-responsive dwarf barley and in the same barley variety treated with GA. Seedlings were maintained at 20 °C while their leaf extension zone (LEZ) temperature was reduced either in steps to −6 °C in short-term cooling experiments, or to 10 °C for 48 h in long-term cooling experiments. Short-term cooling resulted in a biphasic response in LER, with a clear inflection point identified. Below this point, the activation energy for leaf extension becomes higher. The short-term response of LER to cooling was altered by the application of GA, which resulted in a lower base temperature (Tb), inflection point temperature and activation energy for leaf extension. Both GA-treated and untreated seedlings were less sensitive to cooling maintained for a prolonged period, with LER making a partial recover over the initial 5 h. Although long-term cooling reduced maximum REGR, it resulted in a longer LEZ and an increase in the length of mature interstomatal cells in GA-treated and untreated seedlings. These changes in overall physiology appear to enhance the ability of the leaves to continue expansion at suboptimal temperatures. In both GA-treated and cold-acclimated tissue, the occurrence of a longer LEZ was associated with a lower temperature sensitivity in LER. en
dc.format.extent 9 en
dc.language.iso eng
dc.relation.ispartof Plant, Cell and Environment en
dc.rights en
dc.title The effect of gibberellic acid on the response of leaf extension to low temperature en
dc.type /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article en
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en

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