The passion fruit is among the major fruit crops grown in Brazil, being propagated by seeds due to ease of implementation. However, obtaining seeds of quality is associated with the proper time of collection. Thus, the objective was to determinate the physiological maturity of seeds of passion fruit (Passiflora edulis f. flavicarpa Degener) using the external color of the fruit. Seeds from passion fruit were collected from four plants. It was adopted a completely randomized design, separating the fruit into four stages of maturation, based on color of the epicarp and quantified as Munsell color chart and refractive index analysis using digital colorimeter. Seeds of completely green fruit did not germinate. Seeds from fruits with advanced stage of maturation tending to wilt, staining with 5 Y 7/10 according to the Munsell color chart and measures of refractive index falling, showed better physiological potential according to the integrity of their membranes, accumulation of dry matter and performance in tests of vigor. This stage was identified as the stage of physiological maturity of the passion fruit.
Key words: Maturation stage, germination, electric conductivity, vigor.
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