ArticlePlanta2025
Influence of edaphic characteristics on the foliar phytobiochemical composition of wild populations of Tithonia diversifolia (Hemsl.) A. Gray in Veracruz.
Article in Planta, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
To elucidate the phytobiochemical mechanisms underlying differentiation among wild populations of Tithonia diversifolia (Helms) A. Gray and establish how soil parameters regulate metabolic pathways.
methods90 individuals from three populations (Ixtaczoquitlán, Orizaba, Rafael Delgado; Veracruz, Mexico) were analyzed. A multi-analytical approach included lipid profiling by gas chromatography-mass spectrometry (GC-MS), identification of secondary metabolites via HPTLC, quantitative bromatological analyses, photosynthetic pigment quantification, and comprehensive edaphoclimatic characterization. Statistical modeling integrated soil chemistry, climatic dynamics, and phytobiochemical responses.
resultsPopulations exhibited distinct metabolic phenotypes shaped by edaphic stress. Plants from Rafael Delgado expressed a classical hormetic response under moderate stress (neutral pH, high EC and CEC, low organic matter, clayey soil), with upregulation of biosynthetic pathways resulting in higher protein content (27.25 ± 1.12% DW) and a diverse fatty acid profile (seven compounds). In contrast, Ixtaczoquitlán and Orizaba populations, under more favorable soils, maintained homeostatic regulation prioritizing primary metabolism, with higher chlorophyll accumulation (1.96 ± 0.10 mg g
conclusionsStress-induced metabolic switching emerges as a key adaptive mechanism in this non-model species, highlighting how environmental gradients reprogram biosynthetic pathways. Hormesis-driven enhancement of bioactive compounds positions T. diversifolia as a promising system for biotechnology aimed at stress-induced biocompound production. These findings advance the state of the art in plant metabolic plasticity and support the sustainable exploitation of renewable ethnobotanical resources.
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