Fatma ÖZKAY, Sevinç KIRAN, Ş. Şebnem ELLİALTIOĞLU, Şebnem KUŞVURAN

Change in physiological and biochemical parameters under drought stress in salt-tolerant and salt-susceptible eggplant genotypes

: This study was carried out to determine the changes in chlorophyll and ion contents, lipid peroxidation level, and antioxidativeenzyme activities of 4 eggplant genotypes (Mardin Kızıltepe (MK), Burdur Merkez (BM), Artvin Hopa (AH), and Kemer (K)) withdifferent salt tolerance levels under drought stress. Experiments were conducted in a greenhouse with controlled climatic conditions.When the plants reached the 3–4 leaves stage, 3 different treatments were applied to create the drought levels. The first condition in thestudy was obtained through control application treatment (D0), which was depletion of 40% of the available water holding capacity. Thesecond application (D1) was depletion of 90% of the available water holding capacity. The third application (D2) was no applied irrigationwater. Plants were analyzed with regards to chlorophyll and ion contents, lipid peroxidation levels, and antioxidative enzyme activities.Significant differences were observed among interactions of genotypes and levels of drought stress in chlorophyll and ion (K+, Ca2+, Zn2+,Mn2+, and Fe2+) contents, lipid peroxidation levels, and activities of antioxidant enzymes (superoxide dismutase-SOD, catalase-CAT,glutathione reductase-GR, and ascorbate peroxidase-APX). The chlorophyll and ion contents of eggplant genotypes under droughtstress decreased. However, different levels of lipid peroxidation and antioxidative enzyme activities were observed. The situation changeddepending on genotypes. Lipid peroxidation levels increased under drought stress, especially in salt-sensitive genotypes (AH and K). Onthe other hand, the activities of antioxidative enzymes in the salt tolerant MK and BM genotypes significantly increased. With regard tothe investigated traits, salt-tolerant genotypes were also found to be quite tolerant against drought stress.

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