Daylength change and leaf appearance in winter wheat |
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| Authors: | C K BAKER J N GALLAGHER J L MONTEITH |
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| Institution: | Department of Physiology and Environmental Studies, University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, LEI 2 5RD;Department of Botany, Rothamsted Experimental Station, Harpenden, Herts, AL5 2JQ |
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| Abstract: | Abstract In the field successive leaves of winter wheat appear at a rate which varies because it depends strongly upon temperature. When plotted against ‘thermal time’, however (temperature accumulated above a fixed base of 0°C), leaf appearance was a strictly linear function of temperature. The mean rate of leaf appearance in thermal time, R′, was faster for a spring sowing than for an autumn sowing. The variation in R′ between sowings was better correlated with the rate at which daylength was changing when the plants emerged than with the mean daylength while leaves were appearing. |
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