Variation of dormancy extent of Stylosanthes scabra seeds from three ecogeographic regions of Pernambuco

This study aimed at evaluating the genetic variability of Stylosanthes scabra (Alfafa of Northeast) populations as a result of the adaptation strategy to different environments from the regions: Mata, 'Agreste' and 'Sertão' in the state of Pernambuco. A great interpopulational variability relative to the germination of non scarified seeds was encountered. Populations from 'Sertão', when compared to the ones from 'Mata' and 'Agreste', showed an inferior germination capacity, suggesting that they acquired favorable conditions to dormancy, probably in response to the environmental adversities in that region.

germination; dormancy; evolution