摘要
以黄河三角洲贝壳堤岛贝壳沙为基质,及该岛上生长的优势草本植物二色补血草幼苗为材料,用不同浓度的NaCl溶液(0,50,100,200,300mmol/L)模拟盐胁迫处理30d,探讨二色补血草光合生理生态特性对盐胁迫的响应特征。结果表明:二色补血草对盐胁迫和光合有效辐射(PAR)具有较强的适应能力,在盐浓度为50～100mmol/L条件下,其净光合速率(Pn)、瞬时水分利用效率(WUE)、表观光能利用效率(LUE)、羧化效率(CE)、光饱和点(LSP)、表观量子效率(AQY)均达到最高值,光补偿点(LCP)最低,表明其在此盐分范围内,利用光的能力较强,光照生态幅最宽。当盐分浓度为300mmol/L时,其Pn、WUE、LUE、CE、LSP和AQY显著下降,LCP升高,Pn、Tr、Gs、WUE、LUE、CE对PAR的响应曲线与对照差异较大,即高盐胁迫加重了二色补血草对光的敏感性;WUE、LUE、CE的最优PAR和盐分范围存在一定的差异,低PAR下有利于光能的利用,中PAR下有利于水分的利用,高PAR下有利于CO2的利用;WUE对盐分的适应范围最大,CE其次,LUE最小。
An experiment with shell sand was carried out to study the elIeCts oi teristics of photosynthesis in Limonium bicolor. Five different concentrations of NaCI were applied：0, 50, 100,200,300 mmol/L for 30 d. The resuhs showed as follows：（1）Under 50,100 mmol/I NaC1 stress, the net photosynthesis rate （P,）,instantaneous water use efficiency （WUE）,apparent light use efficiency （LUE） ,carboxylation efficiency （CE）, light saturation point （LSP）, apparent quantum efficiency （AQY） all reached maximum value,which showed Lirnonium bicolor has a strong ability to adapt to salt stress and light intensity. The most wide ecological amplitude of light was observed. The minimum of light compensa tion point （L（TP） was observed. （2）P,,,WUE,LUE,CE,LSP and AQY decreased,but LCP increased with NaC1 stress being 300 mmoi/L. The light response curves of,WUE, LUE, CE were different from control significantly,which showed that the higher the NaCI stress was,the more sensitive of charac teristics of photosynthesis in L. bicolor were about light density. Its ability to use light intensity decreased. The ecological amplitude of light became narrow. The optimal range of PAR for WUE,LUE,UE is differ-ent,which is low PAR,middle PAR,high PAR. WUE has the maximum ability to adapt to salt stress,CE second, L UE minimum.
出处
《西北植物学报》
CAS
CSCD
北大核心
2013年第5期992-997,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家"十二五"科技支撑项目(2011BAC02B01)
山东省高校科研发展计划项目(J11LB54)
滨州学院科研基金项目(BZXYG1114)
滨州学院实验技术项目(BZXYSYXM201010)
关键词
二色补血草
盐胁迫
光合特性
资源利用效率
光响应
Limonium bicolor（Bge.） Kuntze
salt stress
photosynthetic characteristics
resources use efficiency
light response
