Is salt stress of faba bean (Vicia faba) caused by Na+ or Cl– toxicity?
Is salt stress of faba bean (Vicia faba) caused by Na+ or Cl– toxicity?
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DOI：
10.1002/jpln.200900052
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发表时间：
2009-10
影响因子：
2.5
通讯作者：
C. Slabu;C. Zörb;D. Steffens;S. Schubert
中科院分区：
文献类型：
--
作者：
C. Slabu;C. Zörb;D. Steffens;S. Schubert
研究了NaCl、Na 2SO 4和KCl对蚕豆生长和离子浓度的影响。CV. Troy）进行了研究。分别用100 mMNaCl或75 mMNa 2SO 4等渗处理14或15 d后，植株出现中毒症状。这些症状的特点是局部和非褪绿萎蔫斑点，后来变成黑色，坏死斑点。与NaCl或Na 2 SO 4处理相反，用100 mM KCl处理的植物没有表现出这些症状。症状发生在那些叶片上积累的Na+浓度最高，并表现出最高的Na+：K+的比例。我们的研究结果表明，Na+毒害诱导的K+缺乏是负责蚕豆斑点坏死。此外，还出现了褪绿症状。Na+和Cl-的浓度测定在褪绿叶和分离的叶绿体。NaCl暴露后叶片中叶绿素的减少可以解释为叶绿体中的高Cl-浓度，并且似乎取决于高Na+浓度。补施Mg 2 +可避免叶片的退绿毒症状.
The effect of sodium chloride (NaCI), sodium sulfate (Na 2 SO 4 ), and potassium chloride (KCI) on growth and ion concentrations of faba bean (Vicia faba L. cv. Troy) was studied. After 14 or 15 d of isoosmotic treatment with 100 mM NaCl or 75 mM Na 2 SO 4 , respectively, plants developed toxicity symptoms. These symptoms were characterized by local and nonchlorotic wilting spots, which later turned to black, necrotic spots. In contrast to NaCI or Na 2 SO 4 treatment, plants treated with 100 mM KCI did not show these symptoms. The symptoms occurred on those leaves that accumulated highest concentrations of Na+ and showed highest Na+: K+ ratios. Our results indicate that Na+ toxicity inducing K+ deficiency is responsible for the spot necrosis of faba bean. Additionally, chlorotic symptoms occurred. The concentrations of Na+ and CI- were determined in chlorotic leaves and in isolated chloroplasts. The reduction of chlorophyll in leaves after NaCI exposure may be explained in terms of high CI- concentrations in the chloroplasts and appears to depend on high Na+ concentrations. Chlorotic toxicity symptoms can be avoided by additional Mg 2 + application.