盐胁迫对芙蓉葵幼苗离子分布及光合特征的影响  

The effect of salt stress on ion allocation and photosynthesis of Hibiscus moscheutos seedlings

作　　者：孙焕荣 封晓辉[2] 张秀梅[2] 刘小京[2] 昝凤桐 

机构地区：[1]河北省南皮县林业局,河北沧州061500 [2]中国科学院遗传与发育生物学研究所农业资源研究中心,河北石家庄050022 [3]河北省南皮县农业局,河北沧州061500

出　　处：《河北农业大学学报》2016年第1期49-56,共8页Journal of Hebei Agricultural University

基　　金：国家科技支撑资助项目(2013BAC02B01)

摘　　要：采用盆栽浇灌NaCl溶液的方式对8个不同盐浓度胁迫下的芙蓉葵幼苗生理响应进行了研究,测定了芙蓉葵叶片的光合特征、渗透调节物质以及不同器官中离子含量。结果表明,随着土壤中NaCl的升高芙蓉葵的叶片气光合特性参数显著下降,叶片对光强的响应程度降低;光化学猝灭系数(qP)、表观光合电子传递速率(ETR)和实际光合量子产量(￠PSⅡ)显著降低;土壤含盐量超过6g/kg后芙蓉葵光合作用受到严重抑制,生长受阻,根、茎、叶生物量显著降低;随着盐胁迫的加剧,根、茎、叶中Na+和Cl-含量明显增加,而各器官中K+、Ca2+、Mg2+含量均显著下降,其中,叶中各种离子的含量最高;高盐胁迫增加了芙蓉葵叶片可溶性糖的含量。In this research,an experiment was conducted by irrigating with different concentations of NaCl solutions to pot planted Hibiscus rnoscheutos seedlings to explore the physiological response of the seedlings under salt stress. In the study, the photosynthetic characteristics of the leaves,the osmotic regulation substance, and the content of ions in H. mosceutos seed- lings under 7 increasing levels of NaC1 solutions was determined. The results showed that with the increase of NaCl content in the soil,the gas exchange capacity of the leaves was signifcantly deceasing,and the response degree of the leaves to light intensity was also decreased. Mean- while,it was significantly reduced for the photochemical quenching coefficient （qP）, apparent photosynthetic electron transport rate （ETR） and actual photosynthetic quantum yield （phi PS Ⅱ）. The photosynthetic capability was severely suppressed when the soil salt content was more than 6 g/kg,and the biomass in roots,stems and leaves was significanlty reduced. With the increase of salt content in the soil,Na^＋ and Cl^- ions in leaves,roots and stems significantly in- creased,whereas the content of K^＋ ,Ca^2＋ and Mg^2＋ ions were signficantly decreased. Besides, most of the ions were accumulating in leaves, and salt stress resulted in an increase of soluble sugar in leaves.

关 键 词：芙蓉葵 盐胁迫 光合能力 离子分布 

分 类 号：S649[农业科学—蔬菜学]