Abstract

Histological characterization of annatto seed coat and variations of bixin drift during physiological maturation

Author(s): Renata Vianna Lima, Jose Carlos Lopes, Renata Maria Strozi Alves Meira

The objective of this study was to investigate the maturation process of Bixa orellana (Bixaceae) seeds. Each inflorescence was identified considering the day of its respective anthesis. Diameter, weight, color, moisture content, and dry weight were determined for each fruit. Seeds were extracted and color, moisture content, dry weight, weight of one thousand seeds, speed germination, percentage of germination and bixin extraction were determined. The conclusions was: the physiological maturity point of the seeds occurred 77 days after anthesis; moisture content and dry weight were the best parameters for describing seed physiological maturity; better germination percentage and better bixin content were certified for seeds extracted 77 days after anthesis; seed vigor increased up to 77 days after anthesis; size and color of the fruits and seeds were also found to be efficient maturation parameters; the macrosclereids present high impermeability with initial fruit dehiscence occurring after 77 days after anthesis.