Abstract
The present study objective was identifying mechanisms of response to water deficit of paricá seedlings. The experiment was conducted in a greenhouse, in 8-liter pots, with substrate consisting of soil (dystrophic Red-Yellow Latosol), in randomized block design, with five different irrigations based on the evapotranspiration of the plants (20, 40, 60, 80 and 100%), with six replications. The plants were irrigated daily, with a water volume corresponding to 100% of the evapotranspired water, and, at 90 days after germination, subjected to ten days of water deficit, after that irrigated during ten days with the different percentages of evapotranspiration, then evaluated. The following variables were measured: number of leaves (NL), plant height (PH), stem diameter (SD), total biomass (TB), total daily transpiration (TDT), total chlorophyll (TC), carotenoids (CAR), root mass ratio (RMR), leaf mass ratio (LMR) stem mass ratio (SMR). Concluded that paricá seedlings response to water deficit with slowing down of dehydration, with reduction of content of carotenoids and increase in root volume. As a consequence of water stress, they reduce the number of leaves, stem diameter, plant height, and, of course, total biomass, aiming at maintaining the internal water, indicating low ability to tolerate stress.
Highlights
The export and domestic consumption of timber grows each year in Brazil and, with it, the necessity to increase the production area and product quality (ASSOCIAÇÃO BRASILEIRA DE PRODUTORES DE FLORESTAS PLANTADAS (ABRAF), 2013)
Physiological variables Carotenoids (CAR) and total chlorophylls (TC) were measured by means of leaflet disks of known area removed, placed in closed glass tubes containing dimethyl sulfoxide (DMSO); later, extraction was carried out in a bain-marie at 65o C for four hours and the aliquots were removed for spectrophotometric reading at 480, 649, and 665 nm
In the analysis of variance, tables 2 and 3, one can observe that among variables, relative water content (RWC) did not present any significant difference, which shows that it was not influenced by stress and that after water replacement, with the different percentages of evapotranspiration, the plant had a behavior similar to the control, even under low water availability
Summary
The export and domestic consumption of timber grows each year in Brazil and, with it, the necessity to increase the production area and product quality (ASSOCIAÇÃO BRASILEIRA DE PRODUTORES DE FLORESTAS PLANTADAS (ABRAF), 2013). Among the main requirements of planted forests to satisfy market demand, we find rapid growth, large species diversity, high density, productivity and specific mass of the wood (BIANCHE et al, 2012). Responsive effect of paricá seedlings to drought is an important tool for the genetic improvement of plants, important to accelerate breeding programs and improve crop management in areas with frequent water deficit In this way, the present study objective was identifying mechanisms of response to water deficit of Schizolobium amazonicum var. The present study objective was identifying mechanisms of response to water deficit of Schizolobium amazonicum var. amazonicum (Huber ex Ducke) Barneby seedlings and their behavior under controlled water deficit
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