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Recalcitrant forest tropical seeds storage and its effects example of symphonia globulifera l.f. from french guyana



Recalcitrant forest tropical seeds storage and its effects example of symphonia globulifera l.f. from french guyana



Bois et Forets des Tropiques (212): 35-46



Through the research of the best storage conditions for a timber species from French Guyana, Symphonia globulifera L.f. (Clusiaceae), a protocol has been defined to study the rain forest tropical seeds characterized by a high moisture content (recalcitrant seeds). Two storage methods, based on moist ambiant, had been proposed by the previous experiments: 1) place the seeds at 15.degree.C, the lowest temperature which does not kill the embryo, 2) germinate the seeds at 25.degree.C, then transfer at 15.degree.C to limit the growth. The repercussions of these treatments on the subsequent development have been analysed. The storage over one year, according to the second method, results with a strong mortality for Symphonia globulifera ; the few anomalies observed during the treatment are not prejudicial to the subsequent development after planting out in nursery. For less than one year, the storage of this species does not pose any problem ; on longer periods only the first method appears to be satisfactory. It must be underlined that up to now the prevention of the germination of the tropical seeds with a high moisture content seems impossible through physical treatments. Will chemical methods reach this aim in the future?

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