Potencial alelopático de seis espécies do gênero Croton L. Na germinação de alface e tomate

Abstract

This study aimed to evaluate the phytotoxicity and allelopathic potential of hydrolats of Croton argyrophylloides Muell. Arg., C. blanchetianus Baill., C. jacobinensis Baill., C. nepetaefolius Kunth., C. sincorensis Mart. ex Muell. Arg. and C. zehntneri Pax. et. Hoffm. in the germination of diaspores of lettuce and tomato. There were daily observations and measurement of the standard test of germination (TSG), first count (1a C) and germination speed index (GSI). The intensity of the phytotoxic activity of each species varied according to concentration, species and photoperiod. C. argyrophylloides, C. blanchetianus, and C. nepetaefolius were inhibited in all photoperiods. Some stimulating effects were observed for C. sincorensis and C. argyrophylloides. Nevertheless, the results of this study provide consistent indications of the allelopathic potential of tested species.