The success of the ecological restoration depends on the appropriate determination of species for implantation in restoration areas. The use of physiological performance as a criterion may help in the selection of species that are less susceptible to abiotic stress, and consequently experience a lower mortality rate. Species of the same genus can even exhibit differences in physiological responses to water deficiency. Thus, we hypothesize that congeneric species have different physiological responses to annual variation in water availability. Our objective was to determine which physiological parameters are more responsive to the differentiation of iso × anisohidric performances between the congeneric species Croton floribundus and Croton urucurana. In addition investigate whether these intrinsic differences are due to the influence of seasonality. We evaluated leaf water potential, stomatal conductance and chlorophyll a fluorescence of the two congeneric species in an ecological restoration area throughout the course of an entire year. Our results show that congeneric species exhibited similar partial isohydric performance, but they differ in stomatal conductance, predawn leaf water potential and photochemistry, especially in the activation of energy dissipation mechanisms via fluorescence due to the influence of seasonal changes, particularly the dry season. We conclude that using these species in the restoration of riparian forests would be advantageous due to their resistance to annual variation in water availability.

中文翻译：

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干旱季节恢复区内同类巴豆物种的光化学和水响应：对物种选择的影响

生态恢复的成功取决于适当确定要在恢复区植入的物种。使用生理性能作为标准可能有助于选择对非生物胁迫较不敏感的物种，因此死亡率较低。同一属的物种甚至可以表现出对缺水的生理反应的差异。因此，我们假设同质物种对水的年度变化具有不同的生理反应。我们的目标是确定哪些生理参数对同属物种Croton floribundus和Croton urucurana之间的iso×异水性能的区分更敏感。另外，调查这些内在差异是否是由于季节性的影响所致。我们评估了一整年中生态恢复区两个同属物种的叶片水势，气孔导度和叶绿素a荧光。我们的结果表明，同类植物表现出相似的部分等渗性能，但它们在气孔导度，黎明前叶水势和光化学方面存在差异，特别是由于季节性变化（特别是干旱季节）的影响，通过荧光激活能量耗散机制。我们得出的结论是，由于这些物种对水可利用量的年度变化具有抵抗力，因此在沿岸森林的恢复中使用这些物种将是有利的。