Dussert Stéphane, Chabrillange Nathalie, Engelmann Florent, Hamon Serge. (1999). Quantitative estimation of seed desiccation sensitivity using a quantal response model : application to nine species of the genus Coffea L.. Seed Science Research, 9 (2), p. 135-144. ISSN 0960-2585.
Titre du document
Quantitative estimation of seed desiccation sensitivity using a quantal response model : application to nine species of the genus Coffea L.
Année de publication
1999
Type de document
Article
Auteurs
Dussert Stéphane, Chabrillange Nathalie, Engelmann Florent, Hamon Serge
Source
Seed Science Research, 1999,
9 (2), p. 135-144 ISSN 0960-2585
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)
