Insights into the evolution and taxonomic meaning of seed fatty acid profiles in Campomanesia (Myrtaceae)

IF 2 4区生物学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY

Biochemical Systematics and Ecology Pub Date : 2025-10-04 DOI:10.1016/j.bse.2025.105148

Yacov Kilsztajn , Leonardo Regnier de Lima Pereira , Marcelo Tomé Kubo , Antonio Salatino , Maria Luiza Faria Salatino

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Abstract

This study explores the composition, taxonomic significance, and evolutionary history of seed fatty acid (FA) profiles in Campomanesia (Myrtaceae), a South American genus comprising approximately 45 species. Seed oils from six Campomanesia species were analyzed using gas chromatography and mass spectrometry. FA-based clustering was then compared with molecular phylogeny derived from nuclear and plastid markers, with Psidium guajava and Feijoa sellowiana included as outgroups. The results revealed a high degree of congruence between FA composition and phylogenetic relationships, as well as species-specific FA profiles that were consistent across individuals from different populations, highlighting their potential as reliable taxonomic markers. While P. guajava and F. sellowiana exhibited high linoleic acid content, Campomanesia species presented more balanced proportions of saturated and monounsaturated FA. Ancestral state reconstructions indicated a consistent evolutionary trend toward reduced proportions of unsaturated FA within Campomanesia. Although correlations with climatic variables such as temperature and precipitation were weak and statistically non-significant, a strong phylogenetic signal was detected. These findings suggest that genetic drift, rather than climate-driven selection, may have played a dominant role in shaping FA profiles, reinforcing their potential utility in taxonomic studies of the genus.

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桃金娘科桃金娘属植物种子脂肪酸谱的进化及其分类学意义

摘要本研究探讨了桃金娘科Campomanesia种子脂肪酸（FA）的组成、分类学意义和进化历史。采用气相色谱法和质谱法对6种甘柏属植物的种子油进行了分析。基于fa的聚类比较了来自核和质体标记的分子系统发育，并将番石榴和黄花豆作为外群。结果显示，FA组成与系统发育关系高度一致，并且不同种群个体的物种特异性FA谱是一致的，突出了它们作为可靠分类标记的潜力。瓜石榴和黄麻亚油酸含量较高，而樟树亚油酸饱和脂肪酸和单不饱和脂肪酸的比例更为平衡。祖先状态重建表明，不饱和脂肪酸在坎波马尼亚种群中的比例呈下降趋势。尽管与气候变量（如温度和降水）的相关性较弱且统计上不显著，但检测到强烈的系统发育信号。这些发现表明，遗传漂变，而不是气候驱动的选择，可能在形成FA谱方面发挥了主导作用，加强了它们在属分类研究中的潜在效用。

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来源期刊

Biochemical Systematics and Ecology 生物-进化生物学

CiteScore

3.00

自引率

12.50%

发文量

147

审稿时长

43 days

期刊介绍： Biochemical Systematics and Ecology is devoted to the publication of original papers and reviews, both submitted and invited, in two subject areas: I) the application of biochemistry to problems relating to systematic biology of organisms (biochemical systematics); II) the role of biochemistry in interactions between organisms or between an organism and its environment (biochemical ecology). In the Biochemical Systematics subject area, comparative studies of the distribution of (secondary) metabolites within a wider taxon (e.g. genus or family) are welcome. Comparative studies, encompassing multiple accessions of each of the taxa within their distribution are particularly encouraged. Welcome are also studies combining classical chemosystematic studies (such as comparative HPLC-MS or GC-MS investigations) with (macro-) molecular phylogenetic studies. Studies that involve the comparative use of compounds to help differentiate among species such as adulterants or substitutes that illustrate the applied use of chemosystematics are welcome. In contrast, studies solely employing macromolecular phylogenetic techniques (gene sequences, RAPD studies etc.) will be considered out of scope. Discouraged are manuscripts that report known or new compounds from a single source taxon without addressing a systematic hypothesis. Also considered out of scope are studies using outdated and hard to reproduce macromolecular techniques such as RAPDs in combination with standard chemosystematic techniques such as GC-FID and GC-MS.