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Cenchrus ciliaris is a fixing species on sandy soils. This is one of the most suitable species to maintain a high production at a time of year when the herd needs are high, and Digitaria commutata has significant production compared to other Poaceae. Hawever, there is a degradation of graminaes plants in natural ecosystems in semi arid and arid area. This degradation has grown by lack of water and its loss through evapotranspiration exposing plants to water deficit. It is in this context stands our study : in which the whole work done stresses the point on the determination of the hydric statute in encounter of the luck of water in the two graminae (Cenchrus ciliaris and Digitaria commutata) indigenous dry land. The experimental tests are applied in a controlled environment (growth chamber) to INRGREF Tunis. The analyzes focus on adaptation to water stress at the physiological level made in C. ciliaris Matmata show a higher water stress at which the osmotic adjustment value is of the order of 2.19 MPa the end of the 2 nd cycle of water stress sensitivity. While Cenchrus ciliaris populations of Medenine, Jerba and the Digitaria commutate of Bouhedma show sensitivity to applied stress manifested by adjusting the order of -0.055 values -0.02 and -0.02 MPa, respectively, at the end of the second cycle of stress, regression of these two populations of species, may be due to the irregular and insufficient rainfall in recent years which prevents the increase in survival and development of plants

Water status of two germinate Cenchrus ciliaris and Digitaria commutata indigenous endangered arid zone of Tunisia