Effect of the seed coat on dormancy and germination in Stylosanthes humilis H. B. K. Seeds

Author:

Chaves Izabel de Souza1,Silva Nilo Cesar Queiroga1,Ribeiro Dimas Mendes1

Affiliation:

1. Universidade Federal de Viçosa, Brazil

Abstract

Abstract: Seed of Townsville stylo (Stylosanthes humilis H.B.K.) is known to exhibit a hard seed coat and when freshly harvested also show a physiological dormancy, however, the nature of the co-actions between seed coat and embryo growth that determine dormancy is poorly understood. In this study, physical dormancy of Townsville stylo seeds was not reduced during natural ageing at room temperature, in contrast to the physiological dormancy, which is gradually overcome during after-ripening. Furthermore, the permeability of seed coat was affected by scarification treatments as well as by low-pH solutions. Together, these data indicate that physical dormancy overcome of seed is prerequisite for radicle protrusion and physiological dormancy of Townsville stylo seeds contribute to its timing.

Publisher

FapUNIFESP (SciELO)

Subject

Agronomy and Crop Science

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