Influ那ncia da luz e da temperatura na germinaˋˋo de sementes de Marcetia taxifolia (A. St.-Hil.) DC. (Melastomataceae)

作者：Silveira; Fernando A O; Negreiros; Daniel; Fernandes; G Wilson

来源：Acta Botanica Brasilica, 2004.

DOI：10.1590/S0102-33062004000400015

• rupestrian fields
• photoblastism
• seed germination
• serra do cipo.

marcetia taxifolia (a. st.-hil.) dc. (melastomataceae) is a shrub widely distributed in the rupestrian fields of serra do cip車, brazil. in spite of m. taxifolia being a potential species to be used in land rehabilitation, no complete study has been conducted regarding its seed germination. the goal of this work was to evaluate the effect of light and temperature on seed germination of m. taxifolia. seeds were collected in may/2001 and were submitted to germination tests at constant temperatures of 15, 20, 25, 30 and 35oc under a photoperiod of 12 hours, and in the absence of light for 30 days. there were statistically significant differences between seed germination and mean time of germination for seeds submitted to the light and dark treatments at 15, 20, 25 and 30oc (p %26lt; 0,05; all). seed germination under 35oc was totally inhibited. the higher germination percentages were obtained at 15 and 20oc, which differed significantly from the temperatures of 25 and 30oc (anova = 13,65; p %26lt; 0,001). the data contribute to further studies focusing the propagation of m. taxifolia for land rehabilitation purposes.