Investigation of Qualitative Morphological and Geographical Diversity among native populations of walnut (Juglans regia L.) in Golestan province

In order to understand diversity among five populations of walnut tree, this research was conducted. Ninety six tree samples were studied for 49 different Qualitative morphological traits (according to IPGRI and UPOV descriptors). Analysis of Variance traits showed significant differences (P<0.01) among all traits, expect of wide of nut form, form of bottom nut, thickness of, hard surface structure, depth of narrow on side of, surface structure, surface tissue, kernel filling and branch cork. Those showed high diversity among native walnut traits in Golestan province. For showing difference of traits among locations, used means comparison and Duncan test. Further results indicated a negative correlation between high altitudes with sensitively to Blight. There was a positive correlation between altitude with cold Tolerance and kernel brightness. Other phenological traits such as seed biophysics and seed morphology (according to IPGRI and UPOV descriptors) were evaluated within this study. This Study showed there are high diversity in native walnuts in Golestan province.