SA和PEG引发处理对NaCl胁迫下玉米种子萌发及幼苗生长的影响

摘要

Seeds of maize(Zea mays L.) Jizhi No. 5 were primed with SA and PEG of different concentrations. The primed seeds were subjected to salt stress of 3 NaCl concentrations(0, 100, 200 mmol·L-1) in standard germination test and a sand culture experiment. The effects of the seed priming with SA and PEG on seed germination and seedling growth under salt stress were investigated. The results show that the seed emergence energy and the emergence rate declined with the increase of NaCl concentration, the growth of seedlings was inhibited, and the accumulation of dry weight reduced. Compared with the control under the same NaCl concentration, the primed seeds with 0.25 mmol·L-1 SA and 15%PEG had higher emergence energy and rate, higher height of seedlings and length of roots, higher dry weight of seedlings and dry weight of roots, so the salt resistance of maize at germination and seedling stages was improved.%　　以冀植五号玉米种子为试验材料，用不同浓度的水杨酸（SA）溶液及聚乙二醇（PEG）溶液对种子进行引发处理。采用标准发芽试验和砂培试验，设3个NaCl浓度（0、100、200 mmol·L-1）模拟盐胁迫，研究SA和PEG引发处理对NaCl胁迫下玉米种子萌发及幼苗生长的影响。结果表明：随着NaCl浓度的增加，玉米的发芽率及发芽势下降，幼苗生长受到抑制，干物质积累量减少。同等NaCl浓度胁迫下，用0.25 mmol·L-1SA和15%PEG引发处理玉米种子，和对照相比，提高了种子的发芽势及发芽率，苗高、根长、地上部和根部干重显著增加，最终提高了玉米芽苗期的耐盐性。