Allelochemicals Biologica... - Name

ANTIMICROBIAL AND NEMATICIDAL SUBSTANCES FROM CHICORY ROOT 179
1.97 (dd)
O
1.11 (d)
2.15 (m)
H3C 1.79 (m)
H H
H
2.16 (m)
H
5.20 (dt)
O
5.95 (s) H
4.00 (t)
H
H
O
H
H 2.18 (ddd)
2.28 (s) H3C 2.87 (dd)
O
H 2.60 (dq)
1.40 (d)
2.2. Nematicidal Substances in Chicory Root
O
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.
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).
CH 3
CH 3
CH 3
H
1.91 (m)
2.01 (dq)
6.17 (qq)
Figure 2. Chemical structure of 8α-angeloyloxycichoralexin. Source: Nishimura et al. (2000).
Reproduced after permission from Kluwer Academic Publisher (Springer).
Hairy roots
R. S. R. =91.0%
Acidic fraction
from rhizoplane
soil
R. S. R. =53.5%
Acidic fraction from
bulk field soil
R. S. R. =100.0%
R. S. R. = Relative Survival Ratio
Inner part
R. S. R. =41.7%
Wounded part
R. S. R. =78.6%
Rhizome skin
R. S. R. =37.5%