Abstract
The growth of two natural populations of cocksfoot from contrasting climatic regions (Norway and Portugal) was studied at four temperatures and two photoperiods. Serial harvests were taken and quadratic curves were fitted to log dry weight and leaf area for each replicate in order to calculate growth attributes at a constant plant weight for all treatments. Interactions of population, temperature, and photoperiod on relative growth-rate (RGR) were found, with the greatest population differences at 5 and 30 °C in an 8-h photoperiod. Leaf-area ratio (LAR) played a larger part than net assimilation rate (NAR) in determining the differential population responses in RGR to daylength, and these differences in LAR were primarily the result of different patterns of dry-matter distribution within the plant.
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