Germination-Rate Dependency on Temperature ofGeranium carolinianumSeeds

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Abstract
Germination-rate dependency on temperature in the sub-optimal range and its spread in a seed population of Geranium carolinianum L. were analysed through a detailed time course study. With and without Arrhenius transformation the relationship between the germination rate and temperature could be well approximated by straight lines. The thermal time (θ), one of the parameters characterizing the simple linear relationship had a distribution within the seed population, which could be described by the following distribution function: F(θ)= l−[Aθ−m+ (A/3) ⅓)3 + 1) ½ where m is the median of the distribution and A is a shape parameter characterizing the pattern of the distribution. Moist chilling treatment for 3–7 d caused a change in the value for A to make the spread of germination time much wider.