| Autor: |
Dos Santos WR; Postgraduate Program in Plant Production, Academic Unit of Serra Talhada, Federal Rural University of Pernambuco, Serra Talhada, Brazil., de Souza LSB; Postgraduate Program in Plant Production, Academic Unit of Serra Talhada, Federal Rural University of Pernambuco, Serra Talhada, Brazil., Jardim AMDRF; Department of Agricultural Engineering, Federal Rural University of Pernambuco, Recife, Brazil.; Department of Biodiversity, Institute of Biosciences, São Paulo State University, Rio Claro, Brazil., de Morais JEF; Postgraduate Program in Plant Production, Academic Unit of Serra Talhada, Federal Rural University of Pernambuco, Serra Talhada, Brazil., Dos Santos MMP; Department of Biodiversity, Institute of Biosciences, São Paulo State University, Rio Claro, Brazil., de Souza CAA; Postgraduate Program in Plant Production, Academic Unit of Serra Talhada, Federal Rural University of Pernambuco, Serra Talhada, Brazil., da Silva TGF; Postgraduate Program in Plant Production, Academic Unit of Serra Talhada, Federal Rural University of Pernambuco, Serra Talhada, Brazil.; Department of Agricultural Engineering, Federal Rural University of Pernambuco, Recife, Brazil. |
| Abstrakt: |
In semi-arid regions, is necessary to explore strategies to mitigate abiotic stresses such as water deficit and salinity. This study aimed to evaluate the stress tolerance capacity of three species subjected to different water regimes and salinity levels, based on dry matter production and water use efficiency (WUE). The species Handroanthus impetiginosus , Vachellia farnesiana , and Amburana cearensis were evaluated in combination with different water regimes (50%, 75%, and 100% of reference evapotranspiration - ET 0 ) and salinity levels (0.18, 1.50, and 1.90 dS m -1 ). The results show that biomass accumulation increased at 50% and 75% ET 0 , while the WUE decreased at 100% ET 0 . The salinity level (1.90 dS m -1 ) caused reductions in leaf dry biomass (LDB), total dry biomass (TDB), LDB/TDB ratio, and WUE. The negative effects of high salinity on plant height were greater with the application of 75% ET 0 . The highest WUE was obtained at 50% ET 0 for A. cearensis and H. impetiginosus , while V. farnesiana obtained the highest WUE at 75% ET 0 . A. cearensis exhibited the highest biomass accumulation (2.58 g) and WUE (0.21 g L -1 ). Overall, the species can tolerate drought and salinity conditions, being sensitive to high salinity concentrations during their initial growth. |
