title: [Effects of salt stress on physiological characters and salt-tolerance of Ulmus pumila in different habitats].
abstract: Taking the Ulmus pumila seedlings from three different habitats (medium-, mild-, and non-saline soils) as test materials, an experiment was conducted to study their salt-tolerance thresholds and physiological characteristic under different levels (0, 2, 4, 6, 8, and 10 g X kg(-1)) of salt stress. With increasing level of the salt stress, the seedlings taken from medium- and mild- saline habitats had a lower increment of leaf membrane permeability, Na+ content, and Na+/K+ but a higher increment of leaf proline, soluble sugar, and K+ contents, and a lower decrement of leaf starch content, net photosynthetic rate, transpiration rate, intercellular CO2 concentration, and stomatic conductance, as compared with the seedlings taken from non-saline habitat. The salt-tolerance thresholds of the seedlings taken from different habitats were in the order of medium- saline habitat (7.76 g X kg(-1)) > mild- saline habitat (7.37 g X kg(-1)) > non-saline habitat (6.95 g X kg(-1)). It was suggested that the U. pumila seedlings in medium- and mild-saline habitats had a stronger adaptability to saline soil environment than the U. pumila seedlings in non-saline soil environment.
authors.affiliation: College of Forestry, Agricultural University of Hebei, Baoding 071000, Hebei, China.
authors.forename: Bing-Xiang
authors.initials: BX
authors.lastname: Liu
authors.forename: Zhi-Gang
authors.initials: ZG
authors.lastname: Wang
authors.forename: Hai-Yong
authors.initials: HY
authors.lastname: Liang
authors.forename: Min-Sheng
authors.initials: MS
authors.lastname: Yang
mesh_terms: D000222:Adaptation, Physiological; D002681:China; D017753:Ecosystem; D055049:Salt Tolerance / Q000502:physiology*; D036226:Seedlings / Q000254:growth & development / Q000502:physiology; D012965:Sodium Chloride / Q000494:pharmacology*; D013312:Stress, Physiological / Q000502:physiology*; D034403:Ulmus / Q000254:growth & development / Q000502:physiology*
chemical_list: D012965:Sodium Chloride