PJB-2017-529
EFFCTS OF SALT STRESS ON GROWTH AND PHYSIOLOGICAL CHARACTERISTICS OF POMEGRANATE CUTTINGS
Cuiyu Liu
Abstract
With 2-years-old pomegranate (Punica granatum L.) cv. �Tunisia� cutting plants as materials, the growth, salt injury indexes, leaf membrane permeability, Chlorophyll (Chl) content, malondialdehyde (MDA) content, proline and soluble protein content, and the activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) were investigated under different NaCl concentration (0, 1, 2, 3, 4, 5, and 6� (w/w)) treatments after 35 days. The results showed that: the height and ground diameter of pomegranate were promoted in low salinity (1�), and they were significantly inhibited in high salinity (? 5�). With increasing NaCl concentration, Chl a, Chl b, and Chl (a + b) contents decreased with chlorophyll a/b raising, leaf membrane permeability obviously was enhanced and the amount of MDA markedly enlarged compared with the control group at high salinity level (? 5�), the proline and soluble protein significantly accumulated (3�) and quickly responded to NaCl stress, and the activities of SOD, CAT, and POD showed a trend of first rising and then decreasing, with the maximum appearing at 4� NaCl concentration. Our study suggested that: pomegranate cv. �Tunisi� was a moderately tolerant cultivar to salt stress (4�) with a promoting of growth in low salinity (1�). The cultivar presented mechanisms that alleviated the detrimental effects of salt stress through improving proline content, soluble protein content and the activities of antioxidant enzymes in a limited range of salinity.
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