Distribution of thiophenes in Tagetes mendocina Phil. and Tagetes argentina Cabrera
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The distribution of four thiophenes: α-terthiophene (α-T), 5-(but-3-en-1-ynyl)-2,2'-bithiophene (BBT), 5-(4-hydroxy-1-butynyl)-2,2'-bithiophene (BBTOH), and 5-(4-acetoxy-1-butynyl)-2,2'-bithiophene (BBTOAc) was studied during the first 15 weeks of the ontogenetic cycle in two wild species of Tagetes. The four mentioned thiophenes were detected in roots and shoots of T. mendocina and T. argentina in variable concentrations along the experimental period. The roots of both species were the site of major accumulation. BBT showed the highest concentration in the whole plant. In T. argentina, the high content was found just before flowering, while in T. mendocina, the total thiophene concentration reached its maximum value in the 8th week, seven weeks before flowering.
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