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ABSTRACT:The physiological tolerance mechanisms of some plants to salt and water stress during germination are already well known. However, little is known about these mechanisms in native Caatinga species, based on this, this study aimed to evaluate the influence of stress on seed germination of the Caatinga native species, Piptadenia stipulacea (jurema blanca), Mimosa caesalpiniaefolia (sabiá), Caesalpinea ferreae (jucá) and Pityrocarpa moniliformis (catanduva). Salt treatments corresponded to 0; 40.36; 80.72; 121.09 and 165.41 mM NaCl.The following variables were evaluated: percentage of germination (% G), germination speed index (GSI) and mean germination time (MGT). No significant differences were found for %G of P. stipulaceae; C. ferreae and P. moniliformis for salt treatments. Regarding GSI, the analyzed species presented differences between treatments, except for. P. stipulaceae and P. moniliformis showed to be the most tolerant to salt stress during the germination phase, because they presented high levels of germination, even in the higher doses of salt.KEYWORDS: seed development, salinity, tolerance. GERMINAÇÃO DE ESPÉCIES NATIVAS

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