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Brickellia veronicifolia is a native Asteraceae from Mexico that persists in fragmented habitats. This investigation reports the genetic and chemical diversity of B. veronicifolia . The diversity analysis based on iPBS markers showed an averaged Shannon index ( S ) of 0.3493, a Nei genetic diversity (h) of 0.2256, and a percentage of polymorphic loci average ( P ) of 80.7867%. The population structure obtained by AMOVA revealed that the highest variation found within populations was 94.58%. GC-MS profiling of six populations indicated that major volatiles were β-caryophyllene (11.63%), spathulenol (12.85%), caryophyllene oxide (13.98%), α-cadinol (7.04%), cubedol (6.72%) and tau-muurolol (4.81%). Mantel tests suggested a statistically significant relationship between minor volatiles and geographical distance ( r = 0.6163; p = 0.0470; p ˂ 0.05). Likewise, major volatiles showed a significant correlation with the soil pH ( r = 0.6862; p = 0.0230) and maximum temperature ( r = 0.4999; p = 0.0280). Our study suggests that the variation and genetic divergence of B. veronicifolia has no relationship with climatic parameters, whereas the volatiles are probably influenced by environmental factors and not by the genotype per se. Based on the characteristics of B. veronicifolia , this plant could be considered as a candidate for restoring fragmented shrublands in Mexico.

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Influence of Environmental Factors on the Genetic and Chemical Diversity of Brickellia veronicifolia Populations Growing in Fragmented Shrublands from Mexico