Annual mean temperature ( p < 0.001) and annual precipitation ( p < 0.001) showed highly significant positive correlations with purpurin content ( Figures 5D, E ), whereas annual sunshine hours showed a significant negative correlation with purpurin content ( p < 0.05) ( Figure 5F ).
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Effects of geographical, soil and climatic factors on the two marker secondary metabolites contents in the roots of <i>Rubia cordifolia</i> L.
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