The Reaction of Some Qualitative Changes in the kernel of Different Walnut Genotypes in the Storage Period

The walnut has a multipurpose use, so that it is cultivated in pomology for its fruit, in forestry for the use of wood, in pharmaceuticals as a medicinal plant, and in parks as an ornamental plant. In order to investigate some qualitative postharvest characteristics the kernel of 14 superior walnut genotypes (Sisakht 1 and 2, Delirej 1 and 2, Shahniz 1 and 2, Kowkhdan 1 and 2, Setangan 1 and 2, Ganjegun 1 and 2 and Vezeg 1 and 2), an experiment was conducted in Kohgiluyeh and Boyar Ahmad provinces during 2019 to 2020. Qualitative characteristics such as oxidative stability of walnut kernels (peroxide value), percentage of moisture and weight loss of kernels after 6 months of storage and sensory evaluation after 14 months of storage at 25°C were evaluated. The results showed that the peroxides value in walnut kernels increased during storage. After 6 months of storage in the warehouse, the lowest peroxide value was observed in the genotypes of Vezg 1 and Ganjegun 2. The results of the sensory evaluation showed that Ganjegun 2 and Vezg 1 genotypes had the highest and Delirej 1 and 2 genotypes showed the lowest overall acceptance rate after 14 months of storage. Finally, Vezg 1 and Ganjegun 2 genotypes are recommended for consumption and also in breeding programs due to their better quality and durability after harvesting.