研究氟磺胺草醚施用后大豆苗期生长及生理特征的变化,为农业生产中合理施用除草剂提供科学的依据.以大豆(苏18)为研究对象,采用盆栽试验,分析不同剂量氟磺胺草醚施用对大豆苗期生长及叶绿素荧光参数的影响.结果表明:氟磺胺草醚施用剂量达到或超过225 g a.i./hm2时显著抑制大豆苗期根系生长,促使叶片过氧化物酶活性以及丙二醛含量上升.氟磺胺草醚施用剂量超过450ga.i./hm2时会破坏大豆苗期叶片的光合作用,导致大豆生物量下降.从叶绿素荧光成像看,氟磺胺草醚对大豆光合作用的药害随时间增加而逐渐减弱.过量施用氟磺胺草醚会延缓大豆苗期整体的生长发育,破坏大豆苗期光合作用.
Effect of Fomesafen on Soybean Seedling Growth and Chlorophyll Fluores-cence Parameters
The changes in the growth and physiological characteristics of soybean seedlings after the application of fomesafen were studied to provide a scientific basis for the rational application of herbicides in agricultural produc-tion.Accordingly,we carried out pot experiments to study the impacts of different dosages of fomesafen on soybean seedling growth and chlorophyll fluorescence parameters of soybean(SU18).The results showed that when the dos-age of fomesafen reached or exceeded 225 g a.i./ha,it significantly inhibited the growth of soybean root system,leaf peroxidase activity and the increase of malondialdehyde content.When the application dose of fomesafen exceeds 450 g a.i./ha,the photosynthesis of the leaves of soybean seedlings were destroyed,resulting in the decrease of soy-bean biomass.From the chlorophyll fluorescence imaging,the phytotoxicity of fomesafen on soybean photosynthesis gradually weakened with time.Excessive application of fomesafen can delay the overall growth and development of soybean seedlings and destroy photosynthesis in soybean seedlings.
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