Abstract

ROSO, Rodrigo et al. Biometric characteristics and physiological seeds of Echium plantagineum L. in different times of harvesting. Rev. de Ciências Agrárias [online]. 2019, vol.42, n.4, pp.161-170. ISSN 0871-018X.  https://doi.org/10.19084/rca.18099.

The objective of this work was to evaluate the biometric and physiological characteristics of diaspores (carcerulide: seeded seed fruit) of Echium plantagineum harvested at different times, and the influence of diaspores storage on seed germination and viability. A 5 x 2 factorial was used to evaluate fruit harvesting times (03/Oct, 18/Oct, 01/Nov, 15/Nov and 01/Dec) and dormancy break treatment (presence or absence). The diaspores were submitted to physiological quality evaluation through tests of germination, germination speed index and seed viability after each harvested and after storage for six months, as well as their biometric characterization. The fruits produced at the beginning of the reproductive period present have larger dimensions and larger mass, occurring seeds dormancy before fruit dispersal. There is variation in the germination of E. plantagineum seeds during the fruit harvesting periods, which may be related to genetic and environmental factors. Seed dormancy is broken with storage for six months and immersion in potassium nitrate (0.2%) for 12-h and gibberellic acid (500 mg L^-1) for 48-h.

Keywords : gibberellic acid; diaspores; purple-flower; potassium nitrate; viability.

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