赤霉素浸种对盐胁迫下冬葵种子萌发及芽苗生长的影响OA

This study aimed to investigate the effect of gibberellin(Gibberellin,GA)seed soaking on the germination and seedling growth of Malva verticillata L.seeds under salt stress.The impact of salt stress,simulated using different concentrations of NaCl solutions,on seed germination was analyzed.Based on this,a concentration of 150 mmol/L NaCl,which showed significant inhibitory effects,was selected to study the regulatory effects of different GA concentrations on the germination and physiological indicators of Malva verticillata seeds and seedlings.The results showed that with increasing NaCl concentration,the germination rate,germination potential,and germination index of Malva verticillata seeds showed a decreasing trend,while the germination inhibition rate gradually increased.Significant differences in all indicators were observed,particularly at the salt stress concentration of 150 mmol/L.Under this salt stress condition,the application of exogenous GA treatment enhanced the germination rate,germination potential,and germination index to varying degrees,effectively allevi-ating the salt stress-induced inhibition of seed germination.The application of 50 mg/L GA yielded the most significant effects,not only sig-nificantly increasing biomass accumulation and total chlorophyll content but also reducing superoxide dismutase(SOD)activity,malondi-aldehyde(MDA),and total flavonoid contents.In conclusion,GA seed soaking at an appropriate concentration can enhance the salt tolerance of Malva verticillata seeds by activating the antioxidant defense system to counteract oxidative damage caused by salt stress,thereby pro-moting seed germination and seedling growth under salt stress conditions.This study provides a theoretical basis and technical support for the cultivation and promotion of Malva verticillata L.in saline-alkali areas.