A laboratory experiment was conducted during 2002-003. The purpose was
to develop an effective and rapid screening tool to assess the genetic variability
for the response of some local barley varieties to polyethylene glycol- induced
osmotic stres
s at early growth stage. Also this will help to evaluate the relevance
of pre-exposure of barley seedlings to sub-lethal (induction) levels of osmotic
stress. This might enhance the capacity of seedlings to tolerate the lethal levels
of stress.
In this research two methods for preserving the chloroform extract in the
roots of the Ferula hermonis were studied. The first one is summarized in
putting the roots in refrigerators, and the second one is the freez drying of the
roots.
The resul
ts of the experiment have shown that the percentage of waste of the
chloroform extract increased considerably in the first method with the increase
of the time of preservation, whereas in the case of freeze drying method, the
percentage of the waste of the chloroform extract was relatively low compared
to the first method. We think that this method (freeze drying) is practical for
the preservation of the chloroform extract, which expresses the active material
in the ferula hermonis roots, and can be considered as cost – effective as far as
the exploitation of these roots is concerned.
