RESUMONo intuito de compreender as estratégias de sobrevivência utilizadas pelas espécies da Caatinga para se adaptarem às condições oferecidas pelo clima da região, avaliaram-se o potencial hídrico e a eficiencia quântica da fotossíntese obtida pela fluorescência das espécies: Myracrodruon urundeuva, Schinopsis brasiliensis, Amburana cearensis,Capparys cynophallophora, Anadenanthera colubrina var. cebil, Pseudobombax sp, Commiphora leptophloeos, Ziziphus joazeiro Bumelia sartorum, Caesalpinia ferrea, Maytenus rigida, considerando-se dois períodos de observação: estiagem (1) e chuvoso (2), para se verificar os possíveis identificadores de estresse. Com relação ao potencial hídrico verificaram-se diferenças estatísticas entre as duas estações, porém o fato que chamou a atenção reside nos altos níveis do potencial hídrico, mesmo no período de estiagem que, caracteristicamente, provocaria o estresse hídrico em função da ausência de água no solo. Os dados de fluorescência revelaram ótimos estados nos aparatos fotossintéticos, não indicando condição de estresse. Concluiu-se que as estratégias de sobrevivência dessas espécies são altamente eficientes e resultam de uma alta complexidade evolutiva.Palavras-chave: potencial hídrico, eficiência quântica, semi-árido e recursos naturais Seazonal variations of physiological aspects of Caatinga species ABSTRACTWith the purpose of understanding the survival strategies used by Caatinga species to face the weather conditions, the water potential and quantical photosynthetic efficiency of some species were studied. The data were obtained through the fluorescence of 11 species: Myracrodruon urundeuva, Schinopsis brasiliensis, Amburana cearensis, Capparys cynophallophora, Anadenanthera colubrine var. cebil, Pseudobombax sp., Commiphora leptophloeos, Ziziphus joazeiro, Bumelia sartorum, Caesalpinia ferrea, Maytenus rigidat. Two observation conditions of weather, the dry period and the wet one were studied, in which possible stress characteristics were verified. The study of the water potential presented statistical differences between the studied periods of climate. However, what drew attention were the high levels of water potential, even in the dry period, a situation in which commonly occurs water stress due to absence of soil water. The fluorescence data showed that the photosynthetic states were good with no apparent deficiency of water. In conclusion, it was verified that the survival strategies of these species are efficient and result from a highly complex evolution.
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