浙江农业学报 ›› 2017, Vol. 29 ›› Issue (2): 236-243.DOI: 10.3969/j.issn.1004-1524.2017.02.09

• 园艺科学 • 上一篇    下一篇

NaCl胁迫对马齿苋幼苗生长及体内离子分布的影响

董静, 邢锦城, 洪立洲*, 王茂文, 朱小梅, 刘冲, 温祝桂, 赵宝泉, 丁海荣   

  1. 江苏沿海地区农业科学研究所,江苏 盐城 224002
  • 收稿日期:2016-08-08 出版日期:2017-02-15 发布日期:2017-03-06
  • 通讯作者: 洪立洲,E-mail:ychonglz@163.com
  • 作者简介:董静(1988—),女,江苏盐城人,硕士研究生,研究实习员,主要从事植物逆境生理方面的研究。E-mail:dongjingyc@163.com
  • 基金资助:
    江苏省农业科技自主创新资金[CX(15)1005]; 江苏省自然科学基金面上项目 (BK20151301)

Effects of NaCl treatments on growth and ion distribution of Portulaca oleracea seedlings

DONG Jing, XING Jincheng, HONG Lizhou*, WANG Maowen, ZHU Xiaomei, LIU Chong, WEN Zhugui, ZHAO Baoquan, DING Hairong   

  1. Institute of Agriculture Science in Jiangsu Coastal Area, Yancheng 224002, China
  • Received:2016-08-08 Online:2017-02-15 Published:2017-03-06

摘要: 以马齿苋幼苗为试验材料,研究了沙培条件下,0、100和200 mmol·L-1 NaCl处理对其生长及不同器官中Na+、K+、Ca2+和Mg2+分布的影响。结果表明:不同浓度NaCl处理下,马齿苋幼苗地上部干质量及单株叶片数均有所下降,但根系干质量和根冠比均有不同程度的增加。根、茎、叶中Na+含量较对照均显著升高,且主要储存于根中;K+含量较对照显著下降,茎中K+含量降幅较小,而叶片中降幅较大;叶片中Ca2+和Mg2+含量显著高于茎和根。根、茎、叶中K+/Na+、Ca2+/Na+、Mg2+/Na+比值随NaCl处理浓度的增加而降低,主要原因是Na+净增加;但叶片中K+/Na+、Ca2+/Na+、Mg2+/Na+比值显著高于茎和根系。随着NaCl浓度的增加,马齿苋幼苗从根到茎的离子选择性运输能力先升高后降低,而茎到叶片的离子选择性能力总体呈升高趋势。综合分析表明,马齿苋可能通过将Na+区域化到根系中,并增强植株向茎叶选择运输K+、Ca2+和Mg2+的能力,从而缓解NaCl处理对马齿苋的伤害。

关键词: 马齿苋, NaCl, 离子含量

Abstract: A sand culture pot experiment was conducted in order to investigate the effects of 3 NaCl stress levels of 0, 100, 200 mmol·L-1 on seedling growth and distribution of Na+, K+, Ca2+ and Mg2+ in different organs of Portulaca oleracea. The results showed that under different levels of NaCl stress, dry weight of shoots and leaves number were decreased, while dry weight of roots and root/shoot ratio were increased. Among these three organs, content of Na+ was significantly increased compared with that of the contrast seedlings, and mainly concentrated in roots. Moreover, K+ contents dramatically decreased, and the decrease range of the K+ contents was larger in leaves and smaller in stems. Ca2+ and Mg2+ contents in leaves were dramatically higher than those in stems and roots. With the increase of NaCl stress concentration, ratios of K+/Na+, Ca2+/Na+, Mg2+/Na+ were decreased, primarily due to the increasing accumulation of Na+. Besides, ratios of K+/Na+, Ca2+/Na+, Mg2+/Na+ in leaves were relatively higher than those in stems and roots. The ability of ion-selective transportation from roots to stems of Portulaca oleracea seedlings increased first and then decreased, and that from stems to leaves gradually increased with the increasing NaCl stress. The results of comprehensive analysis indicated that Portulaca oleracea possibly protect seedlings from damage caused by NaCl stress via compartmentalization of Na+ into roots and increasing the upward transportation of K+, Ca2+ and Mg2+.

Key words: Portulaca oleracea L., NaCl, ion content

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