Vulnerabilidade de sementes de aroeira-do-sertão (MyracrodruonurundeuvaAllemão) às mudanças climáticas globais

Abstract

Myracrodruon urundeuva Allemão is an arboreal species popularly known as aroeira-do-sertão. It is considered one of the native species with economic importance due to its wood and medicinal characteristics.The objective was to obtain thermal and osmotic limits, based on the thermal time, water time and hydrothermal time models, in order to test the efficiency of these models and describe the germination behavior of M. urundeuva seeds in adverse conditions and in future climate change scenarios. In addition, the relationship between climatic factors and the germination of different havestsM. urundeuva seed was determined, as well as the prediction of these seeds germination in future climate change scenarios. Reducing weeks with minimal rainfall will directly affect seed germination and recruitment of seedlings. The temperature of 30 °C promoted a higher germination percentage for seeds in solutions prepared with PEG. As osmotic potential of medium was reduced, there was also a reduction in seedling values. It is concluded that M. urundeuvaseeds are tolerant to a wide range of temperature and osmotic potentials. Climate models allow us to identify the germination responses of M. urundeuva in the future climate change scenarios. Temperature interfered with the germination response of M. urundeuva seeds under different osmotic potentials. Germination and formation of M. urundeuva seedlings were negatively affected by reduced osmotic potential prepared with PEG and NaCl. The germination M. urundeuva seeds can be evaluated by means models based on the concept water and hydrothermal time. The seeds quality produced from M. urundeuva is linked to the maximum, average and minimum temperatures, average and minimum humidity and precipitation. And in future climate change scenarios, there will be a reduction in the physiological quality of M. urundeuva seeds caused by fluctuations in climate variables