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Research Journal of Environmental Sciences

Year: 2014 | Volume: 8 | Issue: 1 | Page No.: 29-38
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Authors

Davood Khoshbakht

Ali Akbar Ramin

Bahram Baninasab

Keywords

Research Article

Citrus Rootstocks Response to Salinity: Physio-biochemical Parameters Changes

Davood Khoshbakht, Ali Akbar Ramin and Bahram Baninasab
Salinity is amongst the most significant environmental factors responsible for substantial losses in agricultural production worldwide. This is a critical problem especially in citrus since they are one of the most globally important horticultural crops considered salt sensitive. The effects of salinity (0, 25, 50, or 75 mmol NaCl) investigated on visible symptoms of leaf damage, electrolyte leakage, relative chlorophyll contents (Chl) (spot values), relative water content (RWC), proline and chlorophyll fluorescence yields (Fv/Fm) in nine citrus rootstocks including: Sour orange, Bakraii, Cleopatra mandarin, Rangpur lime, Rough lemon, Macrophylla, Swingle citrumelo, Citrange and Trifoliate orange. The lowest visible symptoms of leaf damage were found in Cleopatra mandarin. The highest and the lowest electrolyte leakage levels were observed in the Trifoliate orange and Sour orange, respectively. By increasing the levels of salt Chl, RWC and Fv/Fm decreased. The lowest rate of reduction in Chl observed in Cleopatra mandarin and Sour orange. RWC level was higher in the leaves of Sour orange, Cleopatra mandarin and Bakraii, respectively. The lowest rate of reduction in Fv/Fm observed in Cleopatra mandarin, Sour orange and Rangpur lime. Increasing the salt levels led to significant increase in proline content of leaves in all rootstocks. Based on the results it was found that Sour orange, Cleopatra mandarin were the most tolerant rootstocks to salinity of all nine studied. In addition Trifoliate orange, Citrange and Swingle citrumelo were the most sensitive citrus rootstocks to salt stress followed by the Rough lemon and Macrophylla that showed a low-to-moderate tolerance to salt stress, and Rangpur lime and Bakraii, with a moderate-to-high tolerance to high salinity.
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