Abstract Detail

Phytochemical Section

Ade-Ademilua , Omobolanle Elizabeth [1], Obi, Oghenekome Henrietta [2].

Variations in essential oils composition of Ocimum gratissimum plants subjected to different irrigation regime under field and shade conditions.

This study investigated the quality (chemical constituents) of the essential oils in leaves of Ocimum gratissimum L. grown under field and shade conditions in combination with different irrigation regime.  Two sets of 42 day old seedlings were grown either under field or under shade with a set watered regularly and the other every 5 days.  Essential oils extracted from fresh leaves (98 days under the various treatment conditions) were analysed using GC-MS.  Eighteen essential oil components were observed across the various populations – eight monoterpenes, six monoterpene oxides, one sesquiterpenes and three phenylpropanoids.  Oils from plants watered daily had higher content of important components compared to oils from plants grown under water stress.  The major constituent in essential oils from plants watered daily under field or shade conditions was linalool (29.72%, 33.48%) followed by  limonene (15.55%, 14.27%), eugenol (11.55%, 11.79%) and γ-terpinene (10.29%, 10.61%).  On the other hand, the major constituent in essential oils from water-stressed plants under field or shade conditions was cis-ocimene (33.18%, 32.64%) followed by linalool (19.06%, 26.04%) and δ-terpinene (16.36%, 21.06%).  δ-terpinene was absent in plants watered daily. Shade condition increased the percentage composition of linalool irrespective of watering condition and the percentage composition of δ-terpinene in water-stressed plants.  Water stress did not only change the composition type of the essential oil of O. gratissimum but also reduced the percentage composition of most of the constituents.  The report is a pointer to the fact that water supply is a major determinant of the composition of the essential oils of O. gratissimum.

1 - University Of Lagos, Botany, Akoka-Yaba, Lagos, N/A, 2341, Nigeria
2 - University of Lagos, Botany, Faculty of Science, Akoka-Yaba, Lagos, 2341, Nigeria

Keywords:
Ocimum gratissimum
essential oils
field
shade
daily watering
camphor
linalool
cis-Ocimene.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PPH001
Abstract ID:137
Candidate for Awards:None