【摘要】 研究了不同浓度NaCl胁迫对番茄种子发芽、幼苗生长及其离子吸收、分布的效应。结果表明,25~100mmol/L NaCl胁迫对番茄的影响主要表现为推迟发芽,但最终并不影响发芽率,而随着NaCl浓度的进一步增加,番茄发芽率明显降低,250~300 mmol/L NaCl处理,发芽率为0。25~300 mmol/L NaCl处理均显著抑制幼苗生长,使干物质积累下降。Na+主要积累在茎秆、根部,叶片中较少,而Cl-主要积累于茎秆。盐胁迫下叶片中K+含量显著增加,根系吸收SK,Na、叶片运输SK,Na均显著上升,表明番茄在离子吸收和向叶片运输过程中,对K+具有较强的选择性。这是番茄具有一定耐盐性的主要原因。更多还原

【Abstract】 Effects of NaCl stress on seed germination,growth and ionic absorption and distribution of tomato seedlings were studied.Results showed that 25-100 mmol/L NaCl didn′t decrease seed germination rate,but delayed the date of seed germination.125-225 mmol/L NaCl obviously decreased seed germination rate and no seed germinated during 250-300 mmol/L.25-300 mmol/L NaCl significantly inhibited seedling growth and decreased dry matter accumulation.Na⁺ was mainly accumulated in stem and root of the seedlings and with lower content in leaves;Cl^- was mainly distributed in stem.K⁺ content in leaves exposed to salinity increased remarkabledly,and absorption of S-（K,Na） in root and transportation of S-（K,Na） in leaves were uniformly promoted obviously.It suggested that higher selectivity of tomato to K⁺ during ion absorption and transportion made tomato with salt-tolerance.更多还原