بررسي روند تنوع ژنتيكي در سنين مختلف جمعيت هايي از سياه تاغ Haloxlon aphyllum

Investigation of the trend of genetic variation on different ages of Haloxylon aphyllum populations.

In order to investigate genetic potential and genetic variation in various Haloxylon populations, an experiment was conducted on genotypes collected from different areas of the country from 1997 at experimental station located nearby to Ghom city called Hossein Abad. The experiment was carried out based on randomized complete block design with three replications. Several morphological characteristics were evaluated on 27 genotypes of Haloxylon aphylom. Analysis of variance and combined analysis of variance were performed on the recorded characteristics that indicate a great deal of genetic variation and differences between the characteristics studied during the years of experiment. Step by step regression reveled that plant height, as the dependent character, has remarkable inter-relationship with trunk diameter, and pest resistance. Based on the results, the genotypes number 18 and 22 originated from Sistan and Baluchestan, genotypes number 12 and 14 from Semnan are determined as the best genotypes. It is recommended to use these genotypes during next phase of the study to estimate required genetic parameter in next generations.