Study of some physiological and biochemical reactions in some Iranian native roses ‎to water deficit stress

Drought stress is one of limitation factors in landscape expantion. In order to investigate response of four wild roses species (Rosa canina, R. beggeriana, R. orientalis & R. persica) to water deficit, a factorial experiment was carried out in a completely randomized block design with two factors Rosa species and water deficit at three levels (control (-0.03), -0.8 (moderate) & -1.5 (Severe) MPa). One year old plant obtained from mentioned rose sucker were subjected to water deficit treatment. Based on the results, leaf mass area (LMA) was different between species and water deficit had no effect on that. Water deficit caused decreased relative leaf water content (RWC), performance index (PI), chlorophyll content and increased electric leakage (EL) and malondialdehyde (MDA) in R. persica. In R. canina RWC, PI and free radical scavenging capacity (DPPH) decreased and EL and MDA increased. In R. beggeriana EL and DPPH increased and in other characteristics difference was invisible. In R. orientalis water deficit had no dramatic effect on traits. Based on the results R. orientalis and then R. beggeriana are more tolerable to drought stress.