The genus Schizolobium has a species divided into two varieties: Paricá belonging to the Amazon forest and Guapuruvu belonging to the Atlantic Forest, both of importance for ecology and forestry due to the quality of the wood. As they are values-adding varieties, information on the physiological mechanisms that regulate the metabolism of plants in a particular environment becomes important to establish their level of adaptation. Thus, the aim was to analyze the possible physiological and biometric differences between the two varieties regarding the tolerance to drought when submitted to the water deficit. The work was developed in nursery, in the experimental field of the State University of Bahia. The design was completely randomized -CRD with 2 treatments and 200 replicates. Statistical analyzes were performed by software R (R CORE TEAM, 2017). The results showed that the growth analysis through the physiological indexes was efficient to identify differences in the initial growth of Schizolobium plants and the physiological characteristics of gas exchanges were negatively affected by water stress in both varieties during the days of stress.

O gênero Erythrina (família Fabaceae) ocorre nas regiões tropicais e sub-tropicais do mundo. Possui cerca de 110 espécies, das quais 70 são nativas da América (VAS-CONCELOS et al., 2003).Dentro do gênero Erythrina está à espécie arbórea Erythrina velutina WILLD popularmente conhecida como mulungu pelo Nordeste brasileiro (LORENZI, 2008). Esta Fabaceae possui porte arbóreo, atingindo alturas de 8 a 12 m, é uma planta de rápido crescimento e de grande resistência à seca (LIMA, 2010). Espécie nativa da Caatinga, o mulungu ocorre em região semiárida e tem sua utilização atrelada à medicina popular com ações comprovadas pela literatura cientifica, (LORENZI; MATOS 2002), assim como também é utilizada como aproveitamento alimentar, artesanato, celulose, papel e para fins paisagísticos.Quando utilizada as sementes para a produção de mudas, os frutos devem ser colhidos diretamente da árvore, quando iniciarem a abertura e a queda espontâneas. Por sua vez, as sementes também podem ser recolhidas do chão, após a queda (CARVALHO, 2008). De acordo com Santos et al. (2013) o mulungu possui limitações quanto ao processo de formação de mudas por sementes devido à ocorrência de dormência tegumentar, o que dificulta a germinação, que ocorre de forma lenta e em baixa porcentagem caso não haja superação da dormência, entretanto, a espécie também se desenvolve por propagação vegetativa.De acordo com Carvalho (2008) e Cavalcante et al. (2016) há poucos dados de crescimento sobre o mulungu, em plantios, sendo esta uma espécie ainda pouco estudada.

The buriti (Mauritia flexuosa L.f.) is a tree species native of the Cerrado with food and medicinal importance in several places as well as for the population of western Bahia. In the west of Bahia, buriti oil is sold in open markets and the fruits are important in the region's culinary and medicinal uses and for that reason it is important to select substrates that guarantee the development of healthy seedlings, aiming at a high survival rate in the field. The objective of this work was to identify suitable substrates for the development of buriti seedlings. The experimental design was a randomized block with ten treatments and four replications. The substrates used were sand, wood shavings, sugarcane bagasse, soil, cattle manure and footpath soil. The conclusion was that the footpath soil was the one (100%) that provided the best development of the buriti seedlings, which is the most recommended for a quick nursery production. However, given the difficulty of obtaining this material, sand (80%) + soil (20%) can be used to replace footpath soil with similar results.