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|Title: ||First report on Meloidogyne chitwoodi hatching inhibition activity of essential oils and essential oils fractions|
|Authors: ||Faria, Jorge|
Rodrigues, Ana Margarida
Figueiredo, Ana Cristina
|Keywords: ||Columbia root-knot nematode|
|Issue Date: ||2015|
|Abstract: ||The Columbia root-knot nematode (CRKN),
Meloidogyne chitwoodi, is an EPPO A2 type quarantine
pest since 1998. This nematode causes severe damage in
economically important crops such as potato and tomato,
making agricultural products unacceptable for the fresh
market and food processing. Commonly used nematicidal
synthetic chemicals are often environmentally unsafe.
Essential oils (EOs) may constitute safer alternatives
against RKN. EOs, isolated from 56 plant samples, were
tested against CRKN hatching, in direct contact bioassays.
Some of the most successful EOs were fractionated and the
hydrocarbon molecules (HM) and oxygen-containing
molecules (OCM) fractions tested separately. 24 EOs displayed
very strong hatching inhibitions (C90 %) at
2 lL mL-1 and were further tested at lower concentrations.
Dysphania ambrosioides, Filipendula ulmaria, Ruta
graveolens, Satureja montana and Thymbra capitata EOs
revealed the lowest EC50 values (\0.15 lL mL-1). The
main compounds of these EOs, namely 2-undecanone, ascaridol,
carvacrol, isoascaridol, methyl salicylate, p-cymene
and/or c-terpinene, were putatively considered
responsible for CRKN hatching inhibition. S. montana and
T. capitata OCM fractions showed hatching inhibitions
higher than HM fractions. The comparison of EO and
corresponding fractions EC50 values suggests interactions
between OCM and HM fractions against CRKN hatching.
These species EOs showed to be potential environmentally
friendly CRKN hatching inhibitors; nonetheless, bioactivity
should be considered globally, since its HM and
OCM fractions may contribute, diversely, to the full antihatching
|Appears in Collections:||BIO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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