GERMINAÇÃO DE SEMENTES DE Chorisia glaziovii O. Kuntze SUBMETIDAS AO ESTRESSE HÍDRICO EM DIFERENTES TEMPERATURAS

Abstract

ABSTRACT Chorisia glaziovii O. Kuntze, the Bombacaceae family is a native forest of northeastern Brazil, popularly known as paunchy, due to bulging trunk. Its fruits are dehiscent and its seeds covered with a fibrous structure (wool) used in upholstery industries. Therefore, it was aimed to evaluate the germination behavior and seed germination of Chorisia glaziovii , subjected to water stress at different temperatures. The treatments consisted of the potential of -0.1; -0.2 And -0.3 MPa simulated with polyethylene glycol (PEG 6000) plus zero (0,0) level using only distilled water, at constant temperatures of 20, 25 and 30 °C in a totally randomized experimental design chance. The analyzed variables were: percentage, first count and rate of germination rate of seeds, plus the length of roots and shoots of height, and dry weight of roots and shoots of seedlings. The highest percentage of germination of Chorisia glaziovii were obtained in the absence of water stress independent of temperature, so the 20 °C detrimental to seed germination, reducing to 20% in potential -0.1MPa; at higher temperatures the seeds were more tolerant to water stress, with a percentage of 68% at this same potential. The seeds of Chorisia glaziovii are sensitive to water stress, with completely inhibited germination at all temperatures in the potential of -0.3 MPa.