3种园林植物耐盐性对比分析

试验以伍兹氏玫瑰(Rosa woodsiiLindl.)、复叶槭(Acer negundoLinn.)、侧柏(Platycladus orientalis)三倍体无性系1年生苗木为材料,测定在不同盐浓度(CK、1‰、2‰、4‰、6‰)胁迫下相对生长量、叶绿素含量、细胞膜透性、净光合速率、气孔导度、胞间CO2浓度、蒸腾速率、Na+、K+、Ca2+含量变化等8项指标。结果表明:随着盐胁迫浓度增加,3种苗木相对生长量、叶绿素含量、净光合速率、气孔导度、蒸腾速率均呈下降趋势,同时细胞膜透性上升,除侧柏三倍体在低盐胁迫下有一定程度下降,胞间CO2浓度无明显变化。3种苗木各个部位Na+、K+、Ca2+含量均呈不同程度变化。综上盐胁迫下,伍兹氏玫瑰以K+和Ca2+为主要的渗透调节物质;复叶槭中K+为主要的渗透调节物质;侧柏三倍体依靠Na+在地下部分大量积累,K+、Ca2+含量在地上部分保持稳定以维持其生长。

Comparison analysis of salt tolerance in three kinds of landscape plants

By studying one year-old seedlings of Rosa woodsii Lindl.,Acer negundo Linn.and Triploid Platycladus orientalis, we identified their relative growth,total content of chlorophyll,leaf electric relative conductivity,net photosynthetic rate,stomatal conductance,intercellular CO2 concentration,transpiration rate under different salt stress(CK,1‰,2‰,4‰,6‰).The results show that with the salt stress concentration increasing,the relative growth,total content of chlorophyll,net photosynthetic rate,stomatal conductance and transpiration rate in these seedlings decreased,but the leaf electric relative conductivity increased and intercellular CO2 concentration had no significant change except that Triploid Platycladus orientalis decreased to some extent in the low-salt stress.Na+,K+ and Ca2+ content also experienced different changes in all three seedlings.It is concluded that K+ and Ca2+ are mainly osmotic adjustment substance in Rosa woodsii Lindl.;K+ is mainly osmotic adjustment substance in Acer negundo Linn.;Na+ is accumulated on the underground part,while K+ and Ca2+ keep stable in above-ground part in order to maintain their growth under salt stress.