Salt resistance of tomato species grown in sand culture
2010
Dogan, M.,Harran Univ., Sanliurfa (Turkey). Dept. of Biology | Tipirdamaz, R.,Hacettepe Univ., Ankara (Turkey). Dept. of Biology | Demir, Y.,Ataturk Univ., Erzurum (Turkey). Dept. of Biology
In this study Na+, Cl-, K+, Ca2+, chlorophyll and proline levels, and the rate of lipid peroxidation level in terms of malondialdehyde (MDA) were investigated in tissues of 15 different tomato genotypes cultivated during a 28-day period in sand culture with 150 mmol NaCl. One of the genotypes was a wild type belonging to Lycopersicon peruvianum, the others were local genotypes belonging to Lycopersicon esculentum. Better NaCl-stress tolerance in salt-tolerant cultivars as compared to salt-sensitive cultivars observed during the present investigation might be due to the restriction of Na+ accumulation and ability to maintain high K+/Na+ ratio in tissues. The chlorophyll level decreased more in salt-sensitive than in salt-resistant cultivars, whereas proline level increased more in salt-sensitive than in salt-resistant cultivars. The exposure to NaCl induced a significant increase in MDA level in both salt-resistant and salt-sensitive cultivars. MDA level was higher in salt-sensitive cultivars. As a result, exclusion or inclusion of Na+, Cl-, K+ and Ca2+ MDA levels, chlorophyll and proline levels may play a key protective role against stress. These features can be used as identifiers for tolerance to salt.
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