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。
关键词:
盐胁迫,
番茄,
发芽率,
离子选择性,
吸收,
运输
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.
Key words:
Salt stress,
Tomato,
Germination,
Ion selectivity,
Absorption,
Transportion
中图分类号:
苏实, 练薇薇, 杨文杰, 郑青松. 盐胁迫对番茄种子萌发和幼苗生长的效应[J]. 华北农学报, 2006, 21(5): 24-27. doi: 10.3321/j.issn:1000-7091.2006.05.007.
SU Shi, LIAN Wei-wei, YANG Wen-jie, ZHENG Qing-song. Effects of Salt Stresses on Seed Germination and Growth of Tomato Seedlings[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2006, 21(5): 24-27. doi: 10.3321/j.issn:1000-7091.2006.05.007.