种子引发对盐胁迫下玉米种子萌发及幼苗生长的影响

以A060233×D123-42（T，耐盐性较强）和D168-83XA06148（S，耐盐性较弱）两个玉米杂交组合为实验材料，利用80mmol·L^-1NaCl溶液对种子进行引发处理。采用营养液砂培实验，设4个NaCl浓度（0、120、200和250mmol·L^-1）模拟盐胁迫，研究种子引发处理对NaCI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，无论经引发处理，还是未经引发处理，两个玉米杂交组合的出苗率均下降，幼苗生长均受到抑制，干物质积累量均减少。同等NaCl浓度胁迫下，引发处理与未引发处理相比，种子出苗率增加，促进了苗高和根的生长，叶面积、苗干重、根干重和耐盐指数增加，叶绿素和脯氨酸含量升高，地上部和地下部的K^＋／Na^＋值增加。

Effect of Seed Priming on Maize （Zea mays L.） Seed Germination and Seedling Growth under Salt Stress

Seeds of two maize（Zea mays L.） hybrid combinations of A060233×D123-42（T,a high salt-tolerant cross combination） and D168-83×A06148（S.a salt-susceptible cross combination） were primed with 80 mmol·L^-1 NaCl.The primed seeds were subjected to salt stress of 4 NaCl concentrations(0、120、200 and 250 mmol·L^-1) in a sand culture experiment.The effects of the seed priming and NaCl stress on seed germination and seedling growth under salt stress were investigated.The results show that with or without priming,seed emergence rate declined.The growth of seedling was inhibited while the accumulation of dry weight reduced.Compared with unprimed seeds under the same NaCl concentration,primed seeds had higher emergence rate,higher height of seedlings and length of roots,higher leaf areas,higher dry weight of seedlings and dry weight of roots,higher salt resistance index,higher contents of chlorophyll and proline,higher ratio of K⁺/Na⁺in shoots and roots of seedlings.