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- Title
Ecophysiology germination of Senna uniflora seeds: species for recovery degraded areas.
- Authors
Nair de Carvalho, Jullyanna; Beckmann Cavalcante, Márkilla Zunete; Aparecida de Carvalho, Pollyanna; Salgado Pifano, Daniel; Garcia Rodrigues, Renato
- Abstract
Studies on seeds ecophysiology are important to understanding of adaptation mechanisms and of species´ tolerance limits to natural conditions, because determine the potential of use in recovery plans of degraded areas. The aim of this study was to characterize and assess the effect of different temperatures, methods of dormancy overcoming and water and salt stresses on the germination of Senna uniflora. Imbibition curve and germination assay were conducted to assess the effect of temperature regimes (20 °C, 25 °C, 30 °C, 35 °C, 40 °C and 20-30 °C), of methods of overcoming dormancy (without scarification, mechanical scarification, chemical scarification and thermal scarification) and of water and salt stresses at the osmotic potentials (0.0; -0.2; -0.4 and -0.8 MPa) . The assessed variables were germination, germination speed index and average germination time. Methods of mechanical and chemical scarification for 5, 15 and 30 min were efficient to overcome physical dormancy, especially on constant temperature regimes of 25 °C and 30 °C and alternated 20-30 °C. Submitted to conditions of water and salt stresses, seeds germination was reduced with the increase of the osmotic potential, being -0.8 MPa the germination minimum limit, in addition, seeds were more sensitive to water stress than to salt stress.
- Subjects
SANANDAJ (Iran); GERMINATION; ECOPHYSIOLOGY; SALINE waters; TEMPERATURE effect; SEEDS; SPECIES
- Publication
Journal of Seed Science, 2020, Vol 42, p1
- ISSN
2317-1537
- Publication type
Article
- DOI
10.1590/2317-1545v42238498