外源甜菜碱浸种对低温胁迫下玉米种子萌发及幼苗生长的影响

Effects of Exogenous Glycine Betaine Seed Soaking on Maize Seed Germination Under Low Temperature Stress and Seedling Growth

为探究外源甜菜碱(GB)的最佳施用浓度,以玉米齐禾401种子为试材,8℃低温胁迫下,调查玉米种子发芽率、发芽势、发芽指数和玉米幼苗的农艺指标、生理指标,分析外源甜菜碱对低温胁迫下玉米种子萌发和幼苗生长的影响。结果表明,低温显著影响玉米种子的萌发和幼苗生长,T4处理(GB浸种)显著提高了低温胁迫下玉米幼苗的发芽率、发芽势、发芽指数,缓解了低温对玉米幼苗生长的影响,SOD活性提高49.80%,POD活性提高42.81%,CAT活性提高159.79%,脯氨酸含量增加172.13%。说明施用适量的GB,可有效缓解低温对玉米萌发和幼苗生长的抑制作用,从而提高了玉米萌发期和苗期的抗寒性,对保证玉米苗齐苗壮有显著作用。

In order to explore the optimal concentration of exogenous glycine betaine(GB),the seeds of maize Qihe 401 were used as test materials to investigate the germination rate,germination potential,germination index,agronomic and physiological indicators of maize seedlings under 8℃low temperature stress,and analyze the effects of exogenous GB on maize seed germination and seedling growth under low temperature stress.The results showed that low temperature significantly affected the germination and seedling growth of maize seeds.T4 treatment(GB soaking)significantly increased the germination rate,germination potential,and germination index of maize seedlings under low temperature stress,alleviated the impact of low temperature on maize seedling growth,increased SOD enzyme activity by 49.8%,POD enzyme activity by 42.81%,and CAT enzyme activity by 159.79%,Proline content increased by 172.13%in antioxidant enzyme activity(SOD,POD,CAT)and proline content.The application of an appropriate amount of GB content can effectively alleviate the inhibitory effect of low temperature on maize germination and seedling growth,thereby improving the cold resistance of maize during the germination and seedling stages,and has a significant effect on ensuring that maize seedlings are healthy and healthy.