DIFFERENTIAL TOLERANCE TO IRON DEFICIENCY OF CITRUS ROOTSTOCKS GROWN IN CALCAREOUS SOIL

In this study, seedlings of 15 citrus genotypes as rootstock were tested in calcareous soil conditions to detect their tolerance to lime-induced chlorosis in Adana-Turkey. The effect of iron chlorosis on leaf active and total Fe, leaf chlorophyll and Fe chlorosis scale were investigated. According to results of leaf chlorophyll and Fe chlorosis scale, Swingle citrumelo, Pomeroy trifoliate and Sarawak bintangor showed severity chlorosis on their leaves but these genotypes had the highest leaf total Fe concentration. Fe paradox was determined on these genotypes. At the end of the experiment, genotypes were classified as Tuzcu 31-31 sour orange, Gou Tou sour orange, Antalya Cleopatra mandarin and Carrizo citrange were very tolerant, Tuzcu 891 sour orange, Volkameriana, Nasnaran mandarin and Marumi kumquat were tolerant, hybrid of Cleopatra mandarin and Swingle citrumelo (C?S) and C-35 citrange were middle tolerant, Swingle citrumelo and Pomeroy trifoliate were susceptible, Sarawak bintangor was little susceptible and Local trifoliate was very susceptible.