Uso do bioestimulante 'Adubo Sertanejo' como promotor de germinação em Passiflora cincinnata

Abstract

The wild passion fruit (Passiflora cincinnata Mast.) is a species native to the Caatinga, resistant to pests and drought. Seedling production depends on the optimization of germination, which is limited by seed dormancy. This study aimed to evaluate the bio-stimulant ‘Adubo Sertanejo’ as a promoter of germination in Passiflora cincinnata. The experiment was conducted at the UFS Campus Sertão laboratory, in a 2×5 split-plot design, with light conditions as the main plots and bio-stimulant doses as the subplots. Seed viability was evaluated using the tetrazolium test, followed by the germination test. The evaluated variables were: germination percentage (G%), first germination count (FGC), germination speed index (GSI), hard seeds (HS), and dead seeds (DS). The tetrazolium test confirmed that the seeds were viable; however, no germination was 6 observed during the evaluated period, indicating that dormancy was not overcome by the biostimulant. The seeds that were not deteriorated after the germination test were subjected again to the tetrazolium test, which showed that the seeds were alive. It is concluded that, under the experimental conditions adopted, the bio-stimulant ‘Adubo Sertanejo’ was not efficient in overcoming the dormancy of Passiflora cincinnata seeds.