الفهرس 
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Abstract
The present work was conducted to elucidate the biochemical
adaptation of some desert species which belong to different life-forms:
perennial herbs (Plantago albicanslip.
al”),
deciduous subshrubs
(Gymnocarpos decandrum ” evergreen subshrubs (Ononis vaginalis
- -
110. va”) and succulent shrubs (Zygophyllum album ”Z. al”). These species
exhibit different modes of droughtresistance
P. ~ evades drought by
shedding all its above-ground organs during the dry period, G. de loses
most of its leaves in response to drought, O. va sheds its mature leaves
~ the dry season, and the leaves of Z. al become succulent. The
evaluation of the biochemical adaptation of these species was carried.