Evaluation on Salt Tolerance of 25 Species of Poplar Cuttings in Lab

摘要

The growth and morphological characteristics of 25 species of poplar were investigated. The cuttings were cultivated in Hoagland Nutrient Solution, which was made with sodium chloride (NaCl) solutions of concentration of 1.00, 3.00, 4.00, 5.00, 6.00, and 8.00 g/L, respectively. Under such salt stress, the new branch length and biomass accumulation of cuttings decreased as the salt concentration increased. The root/shoot ratio of most of species showed an escalation and then reduction tendency. Under low concentration of salt (NaCl ≤4.00 g/L), the root/shoot ratio of 11 species increased, compared to NaCl =1.00 g/L. After salt treatments, with the increase of salinity concentration, the content of chlorophyll of 8 species decreased. Based on the analysis of growth and morphological appearance, it turned out that 6 species had high salt-tolerant, 7 species were moderate salt-tolerant, 7 species were low salt-tolerant and 5 species failed to resist salt stress.