O

Figure 2. Chemical structure of 8a-angeloyloxycichoralexin. Source: Nishimura et al. (2000). Reproduced after permission from Kluwer Academic Publisher (Springer).

2.2. Nematicidal Substances in Chicory Root

We found that the ether and ethyl acetate extracts of chicory roots exhibited the best nematicidal activities. The extracts were separated according to their acidity to give organo-acidic, phenolic, basic and neutral fractions. The phenolic fraction was found to have the highest activity.

R. S. R. = Relative Survival Ratio

Figure 3. The relative survival ratios (%) of the golden nematode (Globodera rostochiensis) following exposure to chicory plant extracts recovered from the skin, inner part, wounded part and hairy roots of chicory and from the acidic fraction of neighboring soil. Source: Nishimura et al. (2000). Reproduced with permission from Kluwer Academic Publisher (Springer).

R. S. R. = Relative Survival Ratio

Figure 3. The relative survival ratios (%) of the golden nematode (Globodera rostochiensis) following exposure to chicory plant extracts recovered from the skin, inner part, wounded part and hairy roots of chicory and from the acidic fraction of neighboring soil. Source: Nishimura et al. (2000). Reproduced with permission from Kluwer Academic Publisher (Springer).

The nematicidal activities of extracts from different parts of a chicory root were examined. The relative survival ratios (R. S. R.) at the root skin, inner root tissue, wounded root tissue and hairy roots were measured (Figure 3). The extract from the root skin exhibited the highest nematicidal activity. Interestingly, the nematicidal activity of an acidic fraction from rhizoplane soil was much higher than that from bulk field soil. We found that some phenolics from the root also exhibited nematicidal activity. Thus, it seems that secondary metabolites such as terpenoids and phenolics can play an important role in chicory defense.

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