Physiological performance of Garcinia gardneriana (Planch. & Triana) Zappi: a species with recalcitrant and dormant seeds
Willian Goudinho Viana, Ana Paula Lando, Rosa Angelica da Silva,Cláudia Dias da Costa, Pedro Henrique Mastriane Vieira, Neusa Steiner
Garcinia gardneriana (Planch. & Triana) Zappi is a native species widely distributed in
Brazil. It has ornamental features, edible fruits, and its leaves have medicinal properties; however,
its potential has not been explored. The aim of this study was to evaluate seed physiological
performance due to dormancy, desiccation and storage tolerance. Only decoated seeds
germinated. Seeds had an initial water content of 1.07 g H2O.g-1 dw and final germination of 95%.
Both desiccation to 0.67 g H2O.g-1 dw and storage at 25 °C for ninety days resulted in decreased
germination, 43 and 41%, respectively. Desiccation below 0.25 g H2O.g-1 dw and storage for ninety
days at 5 °C were lethal. A rapid decrease in enzymic protection by superoxide dismutase and
ascorbate peroxidase was correlated to desiccation sensitivity. Total polyamines content was
higher in fresh seeds and markedly decreased with desiccation. The decrease in enzyme activity
and polyamines content seems to be associated with seed viability loss. In sum, G. gardneriana
seeds have a low tolerance to desiccation and are sensitive to chilling. Therefore, the seeds can be
categorized as recalcitrant and dormant, a rare combination in terms of seed biology.
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