The role of free proline and soluble carbonhydrates in serpentine stress on some serpetinophyte and serpentinovag plants
Abstract
The aim of this study is to exhibit the roles of free proline and soluble carbonhydrates in serpentine stress. For this purpose, contents of free proline and soluble carbonhydrate were analyzed in serpentinophytes (Paronychia angorensis Chaudri) and serpentinovags [both serpentine and non-serpentine Alyssum sibiricum Willd., Centaurea urvillei DC. subsp. stepposa Wagenitz, Salvia absconditiflora (Montbret & Aucher ex Bentham) Greuter & Burdet)]. While free proline content is low in serpentinophytes, soluble carbonhydrate ratio is high (Ch/Pr; 8.5). Free proline in the individuals of serpentinovags growing on serpentine soils is proportionally low, but soluble carbonhydrate ratio is high (Ch/Pr; 2.73, 2.57, 4.83). Soluble carbonhydrate ratio in the individuals of serpentinovags growing on non-serpentine soils increases (Ch/Pr: 7.95, 2.60, 1.96, 13.5) while free proline decreases. Although proline content is higher in some species growing on serpentine soils in comparison to those plants not under stress conditions this is not a general case. It is however observed that soluble carbonhydrate content in serpentine plants is commonly high.
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