The response of Damask rose to drought and the underlying mechanisms involved are not known. In this study, vegetative, propagated rose plants were grown under control and water-deficit conditions in a greenhouse at Taïf University, south-west of Saudi Arabia. Control plants were irrigated to field capacity (FC), while water-stressed plants were irrigated to either 50% FC (mild stress) or 25% FC (severe stress). After 60 days, leaf, stem and root fresh and dry weights (g plant⁻¹), photosynthetic activity, leaf water potential (Ψw), leaf water content (WC), apoplastic water fraction (AWF), osmotic potential at full turgor (Ψs¹⁰⁰) and turgor loss point (Ψs⁰), cell wall elasticity, osmotic adjustment (OA), and some solutes (K⁺, Ca²⁺, Cl⁻, proline and soluble carbohydrates) were evaluated. Water stress significantly decreased fresh and dry weights of R. damascena and all photosynthetic parameters, apart from leaf temperature, which increased. Severe water stress (25% FC) resulted in more negative Ψs¹⁰⁰ and Ψs⁰ values than the mild water stress and control. The AWF did not significantly change in response to water stress. The leaf bulk modulus of elasticity (ε) increased from 2.5 MPa under well-watered conditions to 2.82 and 3.5 MPa under mild and severe water stress, respectively. R. damascena experienced OA in response to water stress, which was due to the active accumulation of soluble carbohydrates and, to a lesser degree, proline under mild stress, along with tissue dehydration (passive OA) under severe stress.

Overall, we identified two important mechanisms of drought tolerance in R. damascena—osmotic and elastic adjustment—but they could not offer resistance to water stress beyond 25% FC.

锦缎对干旱的反应以及所涉及的潜在机制尚不清楚。在这项研究中，无性繁殖，繁殖的玫瑰植物在沙特阿拉伯西南部的塔伊夫大学的温室中在控制和缺水的条件下生长。对照植物被灌溉至田间持水量（FC），而水分胁迫的植物被灌溉至50％FC（轻度胁迫）或25％FC（重度胁迫）。60天后，叶片，茎和根的鲜重和干重（g植^-1），光合作用，叶片水势（Ψw），叶片水含量（WC），质外水分数（AWF），全膨胀下的渗透势（ Ψs ¹⁰⁰）和膨损失点（Ψs ⁰），细胞壁弹性，渗透调节（OA），和一些溶质（K ⁺，钙²⁺，氯^- ，脯氨酸和可溶性碳水化合物）进行了评价。水分胁迫显著下降的新鲜和干重R.大马士革从叶片温度，从而增加了与所有光合参数，开。严重水胁迫（25％FC）导致更多的负Ψs ¹⁰⁰和Ψs ⁰值比轻度水分胁迫和控制。AWF没有响应水分胁迫而发生显着变化。在充水条件下，叶片的体积弹性模量（ε）从2.5 MPa分别增加到轻度和重度水分胁迫下的2.82和3.5 MPa。大马士革 在水分胁迫下，OA经历了OA，这是由于可溶性碳水化合物的活跃积累，在轻度胁迫下脯氨酸含量较低，以及在严重胁迫下组织脱水（被动OA）。

总体而言，我们确定了大马士革耐旱的两个重要机制-渗透和弹性调节-但它们不能提供超过25％FC的耐水胁迫能力。