Estratégias adaptativas de populações de Stylosanthes scabra provenientes de três regiões ecogeográficas de Pernambuco

Abstract

Abstract Abstract Abstract: This research aimed to evaluate the genetic variability of 15 Stylosanthes scabra populations (Alfafa do Nordeste) as a result of the adaptation strategy to different environments from the regions: Mata, Agreste and Sertão in the state of Pernambuco. These populations, obtained from representative samples of seeds, were planted in a field trial at Campo Experimental da Empresa Pernambucana de Pesquisa Agropecuária (IPA). This trial served as a base for the study of fractional energy distribution. The energy allocation to the plant parts, described as a dry matter weight function, classified the populations as r and K strategists, evaluated during the 1 st reproductive cycle. The obtained results show that there is a great interpopulational variability for all the evaluated characters. Based on the obtained data, Brejos de altitude target Stylosanthes scabra populations for K strategists. The populations from Sertão behaved as r strategists. Populations with greater reproductive precocity, like that of Itamaracá, Serra Talhada and Santa Cruz da Baixa Verde, were classified as r strategists, directing a higher percentage of energy relative to the reproductive effort. The great variability between populations represents an adaptation strategy to the different environments as a process of genetic maximization in the species evolution.

Research Article Genetic diversity in natural populations of <i>Stylosanthes</i> <i>scabra</i> Fabaceae using ISSR markers

“…Stylosanthes scabra is a species with widespread occurrence in Brazil's Northeast (Calles and Schultze Kraft, 2016) and can grown in low fertility soils, particularly low phosphorus content, conferring an advantage over other species (Gonzalez et al, 2000;Oliveira et al, 2016). Although S. scabra populations occur in various environments in Brazil, genetic studies at the DNA level have not been performed (Queiroz et al, 2001).…”