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Vegetative growth and morphological aspects of Stylosanthes spp. (Fabaceae) under water deficit conditions
V O Santos1, M N Nascimento1, L S Funch2
1Universidade Estadual de Feira de Santana - UEFS, Departamento de Ciências Biológicas, Programa de Pós-graduação em Recursos Genéticos Vegetais, Laboratório de Germinação, Feira de Santana, BA, Brasil.
Abstract:
The objective of this study was to evaluate the growth and morphological characteristics of Stylosanthes spp. under water deficit conditions. The experiment was conducted under different levels of water availability (60%, 40% and 20%) and involved two genotypes: the accession BGF 11-001, from the Forage Germplasm Bank of the State University of Feira de Santana (UEFS), and the cultivar BRS-Bela. A completely randomized design was used, arranged in a 3×2 factorial scheme. Vegetative growth was monitored, and morpho-functional and morphological traits were measured at the end of the experiment. BGF 11-001 showed reduced leaf sprouting intensity even under ideal water availability, with a more pronounced decrease at 20% availability. In contrast, the Bela genotype showed a reduction only at 20%. Regarding mature leaves, BGF 11-001 maintained a constant intensity, while Bela showed a reduction under all conditions, especially at 20%. The studied genotypes exhibited morpho-functional traits associated with tolerance to water deficit, with the BGF 11-001 accession demonstrating superior productive performance under all water availability levels. However, both genetic materials showed reduced biomass production under water deficit conditions. These results indicate the potential of the BGF 11-001 accession for use in regions with varying water availability, contributing to the selection of genotypes more resilient to water stress.
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