Document Type: Original Article
Associate professor, Research Division of Natural Resources, Kurdistan Agricultural and Natural Resources Research and Education Center, AREEO, Sanandaj, Iran.
Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
The essential oil yield stability of damask rose (Rosa damascena Mill.) as an important medicinal and aromatic plant at different environments has not been well documented. In order to determination of appropriate stability parameters, six statistics were studied for essential oil stability of 35 Rosa damascena landraces in seven locations (Sanandaj, Arak, Kashan, Dezful, Stahban, Kerman and Mashhad) and two years (2007-2008) in Iran, using a randomized complete blocks design with three replications. Significant differences (P<0.01) were observed for essential oil ratio among landraces (G), locations (L), environments (E) and for landrace×location (GL) and landrace×environment (GE) interactions. Positive correlation between environmental variance (S2), coefficient of variation (CV) and regression coefficient of yield over environments (b) with essential oil suggesting that only low yield landraces develop a similar phenotype over a range of environments and show static stability. Although, there weren’t stable landraces by b (b ≈ 0) and all of the stable ones by S2 produced very low yield but some of adaptable ones by CV (e.g. KM1) showed high essential oil ratio and stability simultaneously. The stable landraces according to dynamic stability concept (b ≈ 1, Sd2 or variance due to deviation from regression ≈ 0) produced moderate essential oil. Superiority index (P) determined some of the highest essential oil as adaptable landraces. The stable landraces with the least variance of the years within places (MSY/P) produced the least essential oil. It could be concluded that a genotype can demonstrate both static and dynamic stability with high essential oil. In addition, CV, dynamic view statistics (b ≈ 1, Sd2≈ 0) and P are proposed as desirable parameters for evaluation of essential oil stability with different concepts in damask rose genotypes.