Abstract
Seed imbibitions is the first stage of the germination process and is characterized by the hydration of tissues and cells and the activation and/or induction of the enzymes responsible for mobilizing reserves for respiration and the construction of new cell structures. The objective of this study was to investigate the alterations in reserve substances during slow hydration of Bahia Rosewood (Dalbergia nigra) seeds in water. Seeds from two different lots (Lot I and II) were placed in saturated desiccators (95-99% RH) to hydrate at 15 and 25 °C until water contents of 10, 15, 20 and 25% were reached. At each level of hydration, changes in lipid reserves, soluble carbohydrates, starch and soluble proteins were evaluated. The mobilization of reserves was similarly assessed in both lots, with no differences being observed between the two hydration temperatures. Lipid contents showed little variation during hydration, while the contents of soluble carbohydrates and starch decreased after the 15% water content level. Soluble proteins showed a gradual tendency to decrease between the control (dry seeds) up to 25% water content.
Highlights
The discussion about the need for propagating native species to reclaim and restore the natural landscape in the face of current environmental problems has been increasing in recent years, as has been seen regarding seed production for food and industrial purposes
The objective of this study was to investigate changes in lipid, soluble carbohydrate, starch and soluble protein reserves during hydration of Dalbergia nigra seeds, in order to understand the behavior of these reserves during seed water absorption
The water content of the seeds of lots I and II was determined in an oven at 105 ± 3 °C, using three replicates of 20 seeds for each treatment, with the results expressed as a percentage, according to methodology described by the Rules for Seed Testing (Brasil, 2009)
Summary
The discussion about the need for propagating native species to reclaim and restore the natural landscape in the face of current environmental problems has been increasing in recent years, as has been seen regarding seed production for food and industrial purposes. Ecological and environmental importance, there is little information on how best to propagate the native species originating from different biomes. In the Atlantic Forest, for example, species such as Dalbergia nigra, popularly known as Bahia Rosewood, jacarandá-caviúna, or black rosewood (Papilonoidea), is known for its moderately hard, heavy, decorative and naturally long-lasting wood, which gives this species a high commercial value (Rizzini, 1972; Lorenzi, 1992). Due to these commercial characteristics, this tree species has been heavily exploited and is on the list of plant species threatened with extinction, being classified as vulnerable (Ibama, 2008). Little has been done to further scientific research on the propagation strategy(s), especially germination and the study of soaking, embryo growth and seedling establishment
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