Influência do fotoperíodo na germinação de sementes de catingueira (Poincianella pyramidalis)

Abstract

This study was conducted at the Seed Laboratory of the Universidade Federal do Recôncavo da Bahia in Cruz das Almas, Bahia, to evaluate the influence of photoperiod on seed germination behavior matrices catingueira (Poincianella pyramidalis), A native of caatinga vegetation with a great resistance to drought and high economic potential. The experiment was a Completely Randomized Design in factorial 5 x 2 (five matrices and two photoperiods) totaling 10 treatments with three repetition and 25 seeds per repetition. There were scores of germinated seeds in the second and seventh day after installation of the experiment. We evaluated the Germination Velocity index, the germination percentage, the ratio of root / shoot and root length and shoot. At last count were quantified abnormal seedlings, normal seedlings, hard seeds, dead seeds, germinated seeds and dead seeds germinated. Data were submitted to analysis of variance and tests of means, Tukey and Duncan, at 5% probability. There was no difference in speed of germination index for photoperiods used. The lowest percentage of germination occurred in the matrix in four 12-hour photoperiod. For the conditions under which the experiment was executed, it is recommended for the species Poincianella pyramidalis photoperiod of 8 hours.