Abstract Miconia albicans (Sw.) Triana and Miconia chamissois Naudin, commonly known as “pixirica” and “pixirica-acu”, two Melastomataceae species, are commonly found in Cerrado areas. M. albicans species grows in dry and humid habitats, so it has adapted to both conditions and M. chamissois species grows in humid environment only. In this work, we have investigated the content of triterpenes, flavonols and flavanones in three different Cerrado fragments of Sao Paulo State, involving distinct environments (dry and humid) and seasons (dry and rainy) to comprehend the complex interactions among plants and the seasonal, environmental conditions and geographic locations. The leaves plants materials were harvest in August 2016 (dry season) and November/December 2016 (rainy season) in Pirassununga, Pedregulho and Luiz Antonio in dry and humid environments. The contents of the standards rutin (R), quercetin (Q), miconioside B (B), matteucinol 7-O-β-apiofuranosyl(1 → 6)-β-glucopyranoside (matt), ursolic acid (AU), and oleanolic acid (AO) were determined by HPLC-DAD. The data were analyzed using nonparametric tests, Pearson's linear correlation, principal component analysis and hierarchical cluster analysis. The results demonstrated similar flavanone and triterpene production during the dry period, and similar flavonol and flavanone production in the rainy season, thus confirming a seasonal variation in the content of the compounds in the evaluated specimens. Our results also demonstrated intra- and inter-population variations in compounds patterns, M. albicans contained major amounts of the flavonols R and Q; their concentrations were higher in the rainy season. B and matt were the major compounds in M. chamissois; the matt concentration decreased in the rainy season. The triterpenes AU and AO occurred in both M. albicans and M. chamissois, but their production dropped during the rainy periods. Thus corroborating the adaptation of M. albicans and M. chamissonis to the high stress and low levels of resources presented in Cerrado.

中文翻译：

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环境、地理和季节变化对来自 Cerrado 的 Miconia 物种化学成分的影响

摘要 Miconia albicans (Sw.) Triana 和 Miconia chamissois Naudin，俗称“pixirica”和“pixirica-acu”，是两种 Melastomataceae 物种，常见于塞拉多地区。M. albicans 物种生长在干燥和潮湿的栖息地，因此它适应了这两种条件，M. chamissois 物种只在潮湿的环境中生长。在这项工作中，我们调查了圣保罗州三个不同的塞拉多碎片中三萜、黄酮醇和黄烷酮的含量，涉及不同的环境（干燥和潮湿）和季节（干燥和雨季），以了解植物之间的复杂相互作用和季节性、环境条件和地理位置。叶子植物材料于 2016 年 8 月（旱季）和 2016 年 11 月/12 月（雨季）在 Pirassununga 收获，Pedregulho 和 Luiz Antonio 在干燥和潮湿的环境中。标准品芦丁 (R)、槲皮素 (Q)、木酮甙 B (B)、哑光素 7-O-β-apiofuranosyl(1 → 6)-β-吡喃葡萄糖苷 (matt)、熊果酸 (AU) 和齐墩果酸的含量酸 (AO) 由 HPLC-DAD 测定。使用非参数检验、Pearson 线性相关、主成分分析和层次聚类分析对数据进行分析。结果表明，旱季黄烷酮和三萜的产量相似，雨季黄酮醇和黄烷酮的产量相似，从而证实了评估样品中化合物含量的季节性变化。我们的结果还证明了化合物模式的种群内和种群间变化，白色念珠菌含有大量的黄酮醇 R 和 Q；它们的浓度在雨季较高。B和matt是M. chamissois的主要化合物；雨季亚光浓度降低。三萜 AU 和 AO 都存在于 M. albicans 和 M. chamissois 中，但它们的产量在雨季下降。因此证实了 M. albicans 和 M. chamissonis 对塞拉多呈现的高压力和低水平资源的适应。