Keywords
germination rate
pregermination treatments
arid environments
How to Cite
Abstract
Several authors have studied the inf luence of hydration-dehydration (HD) treatments on the germination of various plant species. Certain seeds preserve a “hydration memory” in order to retain, during dehydration, the physiological changes produced during hydration. The hypothesis is that the seeds of desert species will have a higher germination percentage and a lower mean germination time after being subjected to hydration-dehydration treatments. The aim of this study was to evaluate five species of plants, namely Frankeniagypsophila (I.M. Johnst.), Muhlenbergia arenicola (Buckl.), Muhlenbergia villif lora (Hitch.), Senna demissa (Rose) and Aristida adscencionis L., after being subjected to the following HD treatments: T1= 8h·day-1, T2= 8h·day-1 + 8h·day-1 + 8h·day-1, T3= 24h·day-1and T4= control. HD treatments applied to the five species did not result in an increase in germination percentage. The hydration-dehydration cycles increased the germination rate and decreased the mean germination time (t50) of seeds of F. gypsophila, S. demissa and M. arenicola, which could be interpreted as one of the adaptations of these seeds to rainand drought intervals that occur in arid and semi-arid areas.
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