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Annals of Botany 61: 355-362, 1988
© 1988 Annals of Botany Company

RESEARCH-ARTICLE

The Effects of Temperature on Leaf Growth in Cyperus longus, a Temperate C4 Species

ROSEMARY P. COLLINS* and M. B. JONES

Botany Department, Trinity College, University of Dublin Dublin 2, Ireland

*Institute for Grassland and Animal Production, Welsh Plant Breeding Station, Plas Gogerddan, Aberystwyth SY23 3EB, UK.

Accepted: 12 November 1987   

Plants of the C4 sedge Cyperus longus L. were grown at 10, 20 and 30 °C. An asymptotic growth curve, the Richards function, was fitted to growth data for successive leaves. The mean rate of leaf appearance was a linear function of temperature with 0.014 leaves appearing per day for every 1 °C increase in temperature. The instantaneous relative rate of leaf extension showed a marked ontogenetic drift which was most rapid at 30 °C and slowest at 10 °C. The mean absolute extension rate for foliage had a temperature coefficient of 0.16 cm d–1 ° C–1 in the range from 10 to 30 °C. The duration of leaf growth was independent of leaf number at 10 and 20 °C but increased linearly with leaf number at 30 °C. The small differences in relative growth rate at the three temperatures resulted in large differences in foliage area produced at the end of a 30 d growth period. The final foliage areas at 20 and 10 °C were 51 and 9% respectively of that at 30 °C.

Cyperus longus, temperature, leaf growth, Richards function, growth analysis


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