Abstract:
Objective To study the effects of salt stress on growth and physiological indicators of poplar and to compare the salt tolerance among poplar clones.
Method The seedlings of five poplar clones, i.e. Nanlin-895 (Populus×euramericana 'Nanlin 895'), Nanlin-1388 (P.×euramericana 'Nanlin 1388'), Nanlin-3804 (P. deltoides 'Nanlin 3804'), 110 (P. deltoides×P. cathayana cl. '110') and 328 (P.×euramericana cl. '328') were selected to analyze the survival rate, growth traits, cell membrane permeability, malondialdehyde content and photosynthetic rate treated with 1‰, 2‰, 3‰, 4‰, 5‰ of salt (NaCl) and the CK in a greenhouse. The salt tolerance of clones was comprehensively evaluated by subordinate function method.
Result The height, ground diameter and biomass of all the poplar clones seedling were inhibited under the salt treatments. The survival rate, net photosynthetic rate and chlorophyll content of seedlings decreased with increasing salt concentration, while the cell membrane permeability and malondialdehyde content in leave increased with increasing salt concentration.
Conclusion The salt tolerance of the five clones is in the order of clone 110 > clone 328 > Nanlin-3804 > Nanlin-895 > Nanlin-1388. Clone 110 can tolerate the soil with a salt concentration of 3‰ while the other clones can tolerate the soil with a salt concentration of 2‰.
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