NaCl胁迫对4个树种体内离子分布的影响  

Effects of Na Cl Stress on the Distribution of Ions in 4 Tree Species

作　　者：夏尚光[1] 

机构地区：[1]安徽省林业科学研究院,安徽合肥230031

出　　处：《安徽农业科学》2015年第24期179-183,共5页Journal of Anhui Agricultural Sciences

基　　金：国家林业局"948"项目(2001-35);安徽省财政资金项目(2136203)

摘　　要：通过对木栓榆、厚叶榆、醉翁榆、黄连木4个树种盆栽苗在Na Cl胁迫下不同组织中离子动态分布的研究,结果表明:1厚叶榆、木栓榆Na+总含量均随盐处理浓度的增大而提高,醉翁榆、黄连木Na+总含量不呈单一变化趋势;Na+在4个树种中分布趋势是根最大,茎次之,叶最小。2木栓榆、黄连木、厚叶榆3树种在4 mg/g盐度以下根向茎、叶选择性地运输K+而限制Na+的运输,5 mg/g盐度后根向茎、叶选择性地运输方式正好相反;醉翁榆随盐梯度的升高,根向茎、叶选择性地运输Mg2+而限制Na+的运输。3盐胁迫总体上降低了4树种叶片K+/Na+比值,但厚叶榆和黄连木叶片K+/Na+值变化规律性不强;盐胁迫对4个树种Ca2+/Na+值的影响表现为,醉翁榆、木栓榆在低盐下有所上升,随盐浓度的升高而降低;厚叶榆和黄连木Ca2+/Na+值变化无规律。The potted seedlings of four tree species such as Ulmus gaussenii, U. crassifolia, Pistacia chinensis and U. thomasii were respec- tively treated with different salt densities, the dynamic distribution of the ions in different tissues under NaC1 stress were studied. The results showed ：① the total contents of Na ^＋ in U. crassifolia and U. thomasii increased with the increase of salt concentration. Na ^＋ contents in U. gaussenii and Pistacia chinensis don＇ t express a single changing trend. Na ^＋ distribution is the largest in roots, larger in stems, the minimum in leaves. ②Below 4 mg/g salinity, U. crassifolia, U. thomasii and Pistacia chinensis selectively transport K ^＋ and restrict Na^＋ transport from root to shoot and leaf, in 5 mg/g salinity the selectively transporting ways are opposite; with the increase of salt concentration, U. gaussenii selectively transport Mg^2 ＋ and restrict the Na^＋ transport from root to shoot and leaf. ③On the whole, under salt stress the K^＋/Na^＋ ratios of the 4 species leaves reduced, but the K^＋/Na^＋ ratios in U. crassifolia and Pistacia chinensis leaves don＇t express a stronger regularity. The ratio of Ca^2＋/Na^＋ of the 4 species under lower salinity are up, and decreased with increase of salt concentration ; the Ca^2＋/Na ^＋ ratios of U. crassi- folia and Pistacia chinensis change without rules.

关 键 词：NACL胁迫 离子分布 选择性运输 耐盐性 

分 类 号：S718.5[农业科学—林学]