The effect of eight citrus rootstocks was studied on postharvest quality, including storability of two cultivars of grapefruit namely, Marsh and Ruby Red for five months in cold storage of 10° C with 85% RH for 12 year- old tree fruits. Fruits of trees grafted on Cleopatra mandarin, Carrize citrange, Troyer citrange, Swingle citromelo, Sour orange, Volkamera lemon, Amblycarpa, and King mandarin were tested at the Agricultural Research Station in Dezful. The effect of cultivars and rootstocks as well as the interaction between them was studied in the form of a factorial completely randomized design. Results indicated that varying citrus rootstocks had significant influence on storage life of grapefruit during storage. Regardless of rootstocks, cultivars had no effect on storage life and in most cases, differences were not statistically significant. After five months of storage at 10? C, percentage of fruit decay was high (ca. 5%) in fruit grafted on King mandarin rootstocks for both cultivars. But, least fruit decay was measured for fruits from Volkamera (0.85%). Percentage of weight loss in fruit after storage was high in fruit from Cleopatra mandarin (ca. 15%) and least in fruit grafted on Volkamera lemon (ca. 6%). At the end of storage period, reduction in other fruit qualities i.e. percentage of Juice, TSS, titrable acid (TA) and vitamin C content were almost minimum in fruit grafted on Volkamera, as compared to those grafted on other rootstocks.
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