TY  - JOUR
T1  - Diurnal Variation of the Essential Oil of Four Medicinal Plants Species in Central Region of Iran
AU - , Sadrollah Ramezani AU - , Fatemeh Ramezani AU - , Farzad Rasouli AU - , Mehdi Ghasemi AU - , Mohammad H. Fotokian 
JO  - Research Journal of Biological Sciences
VL  - 4
IS  - 1
SP  - 103
EP  - 106
PY  - 2009
DA  - 2001/08/19
SN  - 1815-8846
DO  - rjbsci.2009.103.106
UR  - https://makhillpublications.co/view-article.php?doi=rjbsci.2009.103.106
KW  - Diurnal variation
KW  -essential oil
KW  -medicinal plants
KW  -yield
AB  - The yield of the essential oil from the leaves of Eucalypt (<I>Eucalyptus nicholii</I>), Rosemary (<I>Rosmarinus officinalis</I> L.), White Cedar (<I>Thuja occidentalis</I> L.) and Lawson Cypress (<I>Chamaecyparis lawsoniana</I>) shows seasonal and diurnal variation. In order to, aerial shoots of those plants harvested in three times (6, 12 and 18) and then dried in shade condition as natural method. The essential oils obtained by hydrodistillation way. This research carried out with 5 replications in random completely design and amount of essential oils measured in any species base on dry mater and data analysis performed with LSD test. Amount of essential oils in both of Lawson Cypress and White Cedar species at 7  h were high in compared with other treatments in 1% level and non significant difference between 12 and 18 times in Lawson Cypress. The results indicated that maximum of essential oil in Eucalypt and Rosemary obtained in 12 and 18 times, respectively that have significant differences with other times in 1% level. According these results we conclude that for obtaining of more yields of essential oil and other volatile compounds, harvesting of matter plants must be accomplished at special time in one day.
ER  -