摘要： 为了研究盐分胁迫对向日葵幼苗K+、Na+吸收和分配的影响,在大田和室内盆栽环境下通过不同浓度盐分胁迫,研究K+、Na+的变化,结果表明:随土壤盐含量的升高,向日葵根、茎、叶中Na+含量均有所增加,K+表现为减少,因而K+/Na+值明显下降|各器官K+/Na+值表现为:叶>|茎>|根部,且叶与根和茎的K+/Na+值差异显著。随着盐碱胁迫的增强,各器官的K+/Na+下降程度存在差异,其中叶的K+/Na+下降显著。不同品种的K+、Na+含量及K+/Na+不同,耐盐性强的品种在盐碱胁迫下K+/Na+值降低幅度小。油用向日葵吸收的Na+主要积累于根部,阻止Na+向地上部运输的拒盐机制是向日葵具有较强耐盐性的主要原因之一。
关键词:
盐分胁迫,
向日葵,
K+,
Na+
Abstract: In order to research on changing of K+,Na+of sunflower under salinity stress. In the fields and in-door potted environment,the changing of K+and Na+of sunflower under different concentrations of salinity stress was studied. The results showed that:with increasing of soil salinity,sodium content of roots,stems,and leaf of sun-flower increased,content of potassium reduced,and thus the K+/Na+was significantly decreased;value of K+/Na+ of leaves was higher than of stems than of roots,and the value of K+/Na+of leaves was significantly different from of roots and of stems. As salinity stress enhancement,the K+/Na+of various organs decreased differently,especially the ratio of potassium and sodium decreased significantly. Different varieties had different content of potassium and sodium,the ratio of potassium and sodium of salt-tolerant varieties decreased less under salinity stress. Sodium of oil sunflower absorption accumulated in the roots,mechanism of refusing salt that prevented sodium transporting to the aboveground is one of the main reason of sunflower with strong salt tolerance.
Key words:
Salt stress,
Sunflower,
K+,
Na+
中图分类号:
侯建华, 于海峰, 安玉麟, 陈泽彬, 李素萍, 聂惠, 郭树春. 盐分胁迫对向日葵K~+、Na~+吸收与分配的影响[J]. 华北农学报, 2013, 28(2): 139-143. doi: 10.3969/j.issn.1000-7091.2013.02.025.
HOU Jian-hua, YU Hai-feng, AN Yu-lin, CHEN Ze-bin, LI Su-ping, NIE Hui,gUO Shu-chun. Research on Changing of K+， Na+of Sunflower under Salinity Stress[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2013, 28(2): 139-143. doi: 10.3969/j.issn.1000-7091.2013.02.025.