Biotechnology
B. Yousefi; S.R. Tabaei-Aghdaei
Abstract
To identify the appropriate detection methods of stable and adaptable genotypes for essential oil yield, an experiment was conducted on 35 Iranian Rosa damascena Mill. genotypes in a randomized complete block design with three replications in seven locations (Kurdistan, Markazi, Isfahan, Khuzestan, Fars, ...
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To identify the appropriate detection methods of stable and adaptable genotypes for essential oil yield, an experiment was conducted on 35 Iranian Rosa damascena Mill. genotypes in a randomized complete block design with three replications in seven locations (Kurdistan, Markazi, Isfahan, Khuzestan, Fars, Kerman, and Khorasan Razavi provinces) during two years (2007-2008). The total mean of essential oil yield was obtained 0.029%. There were significant differences (P≤0.01) between genotypes, locations, environments or location-years, and also the interactions of genotype × location and genotype × environment in terms of essential oil yield. The positive correlation between environmental variance, coefficient of variation, and regression coefficient of yield over environments with essential oil yield showed that only the low essential oil yield genotypes had the similar phenotype in different environments (static stability). There was no stable genotype with the static regression concept and the essential oil production of stable genotypes by environmental variance was very small, but some adaptable genotypes by the environmental coefficient of variation (e.g. KM1) had moderate essential oil yield and yield stability at the same time. The stable genotypes according to the dynamic stability concept had moderate essential oil yield. The superiority index introduced the genotypes with the highest essential oil as the adaptable ones. The stable genotypes with the lowest variance of the years within locations produced the least essential oil. The results showed that a R. damascena genotype can demonstrate the static and dynamic stabilities with the high essential oil yield at the same time. The coefficient of variation, dynamic aspect of regression statistics, and superiority index could be suggested as the desirable statistics to evaluate different aspects (static and dynamic) of essential oil stability in R. damascena. In general, the genotypes IS3, KZ1, and CM1 with the moderate essential oil yield and its general stability and adaptability could be recommended for Iran.