PLASTICITY AND/OR INTEGRATION OF LEAFLET ATTRIBUTES CONFER PHOTOACLIMATION TO SCHINUS TEREBINTHIFOLIUS IN COASTAL ECOSYSTEMS OF THE ATLANTIC FOREST

Raw data of the leaflet attributes of Schinus terebinthifolius (Anacardiaceae) in coastal ecosystems of the Atlantic Forest/Brazil with contrasting irradiance conditions. The following questions were raised: (1) What attributes enable the photoplasticity of S. terebinthifolius? (2) Is this photoaclimation mediated buy integration or by isolated adjustments of leaf functional attributes? (3) Does variation in irradiance influence the relationships among the essential attributes of the leaf economic spectrum? The data demonstrated that The difference in irradiance between the two study areas directly influenced the allocation of carbon during the construction of leaflets. There was greater directing of carbon for the construction of thicker and denser leaflets in Shrub, although with less leaflet area. In addition, a greater amount of δ13C was observed in Shrub, demonstrating that the construction of leaflets was linked to the more efficient use of water. Analysis of quantum yield of photosystem II (PSII) demonstrated that the difference in irradiance between the areas did not influence its photochemical performance. We related this finding to the ultrastructural characteristics of the chloroplasts providing photoprotection to thylakoid membranes and facilitating the repair of photo-damaged PSII. The results showed tha the photoaclimation of S. terebinthifolius is controlled mainly by its high capacity to adjust its phenotype (59.18%), at different levels of organization, and to a lesser extent by phenotypic integration (18.72%).巴西大西洋森林沿岸生态系统中不同光照条件下巴西胡椒木（Schinus terebinthifolius，漆树科Anacardiaceae）的小叶性状原始数据集。 本研究提出以下科学问题：(1) 哪些性状支撑了巴西胡椒木的光表型可塑性？(2) 该物种的光适应过程是通过性状整合介导，还是通过叶片功能性状的独立调控实现？(3) 光照强度的变化是否会影响叶片经济谱（Leaf Economic Spectrum）核心性状间的关联？ 研究结果表明，两个样地间的光照差异直接影响了小叶构建过程中的碳分配策略。灌丛生境中，植株更多将碳用于构建厚度更大、密度更高的小叶，但小叶面积相对更小。此外，灌丛生境下的小叶δ¹³C丰度更高，表明小叶构建与水分利用效率提升存在显著关联。对光系统II（PSII）量子产额的分析显示，样地间的光照差异并未影响该物种的光化学性能。我们将这一发现归因于叶绿体的超微结构特征：其可对类囊体膜提供光保护，并促进光损伤PSII的修复过程。最终结果证实，巴西胡椒木的光适应过程主要由其在不同组织层级上的高表型调控能力主导（贡献率达59.18%），而表型整合的贡献相对较小（仅18.72%）。