Science et changements planétaires / Sécheresse


Study of some anatomic adaptation properties of principal spontaneous perennial plants in the region of Ouargla (Algeria) Volume 23, issue 4, Octobre-Novembre-Décembre 2012


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Université Kasdi Merbah Faculté des sciences Laboratoire de bioressources sahariennes, préservation et valorisation BP 230 Hai Ennasr Bamendil 30000 Ouargla Algérie

This study focuses on the characterization of some properties of anatomical adaptation of the main perennial wild plants in the region of Ouargla. Despite the morphological adaptation mechanisms aiming mainly at preserving as much water as possible, either through succulence or by reducing the size of organs, these Saharan plants present other mechanisms that are even more complex. Indeed, tissue architecture offers the Saharan plants even more opportunities to adapt: first, by the presence of hair, cuticle or the existence of a multilayered epidermis that causes the depression of the stomata; second, by varying the structure of the parenchyma, which determines the type of photosynthetic pathway. The anatomical study of the leaf or the stem of the major perennial wild plants in the region of Ouargla shows different mechanisms of anatomy adaptation such as the change of the structure of parenchyma tissues which determines photosynthetic pathway types with the presence of C3 species (composed of a layer of horizontal cells) and of C4 types (organized in two different sets, elongated cells and cubic cells).