盐胁迫下三种滨藜植物体内盐分离子分布格局

Distribution Pattern of Salt Ions in Three Plants of AtriplexL.under Salt Stress

滨藜属植物作为典型植物分布于全球干旱半干旱地区,其耐干旱、耐贫瘠、耐盐碱能力强,同时具备牲畜适口性好、速生等优良特性,在防治水土流失和改善牧场条件等领域均有所应用.以三种引进滨藜属植物作为试验材料,研究了复合钠盐胁迫下盐分离子在器官水平上的分布格局.结果表明随着胁迫强度的增加,K+、Mg2+在三种滨藜根、茎、叶里的含量在减少,而Na+、Cl-的含量在增加.对三种滨藜离子总量的分析表明,三种滨藜叶片的离子含量占根、茎、叶三者总离子含量的54%-62%,叶片储存了大部分的离子.离子总量在各器官中的顺序是叶>根>茎.

As typical plants in arid and semi-arid regions, plants of Atriplex L. have characteristics such as drought tolerance, sustaining poor soils, saline-alkali tolerance, good palatability and fast-growing. They were widely used in water and soil conservation or pasture improvement. Distribution pattern of salt ions in 3 plants of Atriplew L. were studied and results are as follows：With the increasing of salt stress intensity, the concentration of K＋ ,Mg2＋ in roots, stems and leaves all decreased,on the contrary,the concentration of Na＋ and C; all increased. Total ion concentration in leaves was much higher than in roots and stems,and account to 54 %--62% of the whole plant,the sequence of ion concentration was in leaves〉roots〉stems.