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1. exposure of intact tubers to S-carvone, whereafter the three samples were analysed separately.

2. exposure of wounded (half) tubers to S-carvone.

3. exposure of sprouts, in the one-eve model system, to S-carvone.

1. exposure of intact tubers to S-carvone, whereafter the three samples were analysed separately.

2. exposure of wounded (half) tubers to S-carvone.

3. exposure of sprouts, in the one-eve model system, to S-carvone.

Figure 5 Bioconversion products of S-carvone found in potato tuber tissue

isodihydrocarveol and dihydrocarveol isomers, hydroxylated carvones and carvyl acetates. Figure 5 summarizes the compounds detected in potato sprouts.

S-carvone applied to whole tubers is mainly adsorbed at the skin where it is not converted, as bioconversion takes place only in metabolically active tissue. This implies that bioconversion is not playing an important role in the practical use of S-carvone. Applied as sprout growth regulator, S-carvone will be converted rapidly by the already existing sprouts. Thus an increased or reapplied dosage of S-carvone is needed for effective inhibition, but on the other hand it provides the advantage of a reversible suppressant effect on sprout growth.

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