Temperature effect in the number of seedlings per seed in cultivated specimens of Handroanthus chrysotrichus (Bignoniaceae)
Mots-clés :
polyembryony, seed germination, TabebuiaRésumé
Handroanthus chrysotrichus (Mart. ex DC.) Mattos is a polyembryonic species widely cultivated in urban areas, and with potential interest for reforestation purposes. The effects of light and temperature were tested on the germination rates and on the number of seedlings that emerge per seed. Germinability was higher in light (56%) and in temperatures between 25 and 30ºC (59%). The highest mean numbers of seedlings per seed were observed from 20 to 30ºC. Germinability and the mean seedling number per seed fi t to the quadratic polynomial model, with higher germination rate estimated for 30.1ºC (60.2%) and with the maximum number of seedlings per seed estimated at 26.3ºC (1.9). These results point out that the seed germination rate was more affected by low temperatures than the mean seedling number per seed, but both were negatively affected by temperatures higher than 30°C.
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