Dussert Stéphane auteur aut IRD Chabrillange Nathalie auteur aut IRD Engelmann Florent auteur aut IRD Hamon Serge auteur aut IRD text journalArticle eng text/pdf reformatted digital access Seed desiccation sensitivity was studied in nine species of the genus Coffea by measuring seed viability after equilibration over various saturated salt solutions. A quantal response model based on the logistic distribution was developed in order to describe the typical S-shaped patterns observed. The closeness of fit of the desiccation sensitivity model was shown, and the assumption that seed desiccation sensitivity follows a continuous distribution within species was verified. For each species, the water content at which 50% of initial viability was reached, WC50, and a specific parameter describing the intra-specific variability, Beta, were calculated using a non-linear regression. A simplified water sorption model was developed which allowed easy calculation of water activity and water potential corresponding to WC50 (aW50 and psi50) for relative humidities ranging between 10 and 100%. Distribution of WC50 and psi50 (or aW50) in the genus Coffea was homogeneous within the following intervals : from 0.05 to 0.38 g H2O/g dw for WC50 or psi50 was used for classification. The continuum for desiccation sensitivity observed within the nine species studied confirmed that coffee is an appropriate material for studying desiccation sensitivity. (Résumé d'auteur) specialized CAFE GRAINE DESSICCATION SENSIBILITE RESISTANCE MODELISATION 076PHYBIO02 076AMEPLA02 9 2 135-144 1999 0960-2585 https://www.documentation.ird.fr/hor/fdi:010018287 0960-2585 [F B010018287] https://www.documentation.ird.fr/hor/fdi:010018287 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_49-50/010018287.pdf IRD - Base Horizon / Pleins textes 1999-07-16 2020-08-03 fdi:010018287 fre