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NaCl胁迫对黄瓜幼苗体内K+、Na+和Cl-分布的影响

王素平;郭世荣;胡晓辉;贾永霞;焦彦生   

  1. 南京农业大学园艺学院, 南京 210095
  • 收稿日期:2006-07-20 修回日期:1900-01-01 出版日期:2007-03-15 发布日期:2007-03-15

Effects of NaCl stress on K+, Na+ and Cl- allocation in different organs of Cucumis sativus L. seedlings

WANG Su-ping; GUO Shi-rong; HU Xiao-hui; JIA Yong-xia; JIAO Yan-sheng   

  1. College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
  • Received:2006-07-20 Revised:1900-01-01 Online:2007-03-15 Published:2007-03-15

摘要: 采用营养液水培,以2个耐盐性不同的黄瓜品种为材料,研究了不同浓度NaCl处理下幼苗植株体内K+、Na+和Cl-在器官间的区域化分布及其吸收和运输特性的变化。结果表明:NaCl胁迫下,黄瓜植株体内K+含量下降,Na+和Cl-含量升高,变化幅度随NaCl浓度的升高而增大;不同器官间,茎中Na+和Cl-含量最高,上位叶中Na+和Cl-含量最低、K+含量下降幅度最小。与耐盐性较弱的“津春2号”相比,耐盐性较强的“长春密刺”根向茎运输的SK,Na值较高,根系对Na+的截留作用较强,茎向上位叶运输的SK ,Na和SCl,Na值均较高,叶片中K+含量下降幅度较小,K/Na和Cl/Na比值均较高,功能叶中盐分离子尤其是Na+积累较少,植株生物量较高。说明根系对Na+的截留能力较强且向上位叶运输Na+的选择性较低,是“长春密刺”耐盐性较强的主要原因之一。

关键词: 害虫, 天敌, 群落演替, 枣园, 相互作用

Abstract: By the method of hydroponics, this paper studied the effects of different concentration NaCl on the allocation of K+, Na+ and Cl- in the seedlings of two Cucumis sativus L. cultivars with different levels of salt-tolerance. The results showed that under NaCl stress, the seedlings K+ content decreased, while their Na+ and Cl- contents increased, with the increase in salinity. Among the test organs, stem had the highest content of Na+ and Cl-, while upper leaves had the lowest. The decrease of K+ content in upper leaves was less than that in other organs. Compared with salt-susceptible cultivar ‘Jinchun No. 2’, salt-resistant cultivar ‘Changchun Mici’ had a higher transportation selectivity of K+ to Na+ from root to stem, and of K+ to Na+ and Cl- to Na+ from stem to upper leaves, and retained more Na+ in root. As a result, ‘Changchun Mici’ accumulated more K+ and less Na+ in its leaves, and the ratios of leaf K/Na and Cl/Na were higher.‘Changchun Mici’ also had a higher biomass than ‘Jinchun No. 2’ under same salinity. All of these suggested that the higher accumulation of Na+ in roots and the lower transportation selectivity of Na+ from stem to upper leaves were the main reasons for the stronger salt-tolerance of ‘Changchun Mici’.

Key words: Pest, Natural enemy, Jujube orchard, Community succession, Interaction