The effect of storage at low temperature (4-degrees-C) on the germinat
ion of Trapa natans seeds was investigated. Optimum of germination occ
urred in a temperature range of 15-25-degrees-C. An enhancement of ger
mination was obtained by the cold treatment during the dormancy period
whereas, on the spring period, when the germination capability is beg
inning, no effect was detected. In the seeds analyzed, a long-lasting
germination behaviour was identified which might be of ecological sign
ificance.