外源独角金内酯对玉米幼苗盐胁迫的缓解效应  

Effect of Exogenous Strigolactones on Reducing Salt Stress in Maize Seedlings

作　　者：史沉鱼 黄祯祯 梁美 梁振智 谢彦军 侯青光 SHI Chenyu;HUANG Zhenzhen;LIANG Mei;LIANG Zhenzhi;XIE Yanjun;HOU Qingguang(Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology,Hechi University,Hechi,Guangxi 546300,China;Guangxi Collaborative Innovation Center of Modern Sericulture and Silk,Hechi University,Hechi,Guangxi 546300,China;Guangxi Colleges and Universities Key Laboratory of Exploitation and Utilization of Microbial and Botanical Resources,Hechi University,Hechi,Guangxi 546300,China;Hechi Agricultural Science Research Institute,Hechi,Guangxi 546300,China)

机构地区：[1]广西蚕桑生态学与智能化技术应用重点实验室,河池学院化学与生物工程学院,广西河池546300 [2]广西现代蚕桑丝绸协同创新中心,河池学院化学与生物工程学院,广西河池546300 [3]微生物及植物资源开发利用广西高校重点实验室,河池学院化学与生物工程学院,广西河池546300 [4]河池市农业科学研究所,广西河池546300

出　　处：《陕西农业科学》2025年第3期30-36,44,共8页Shaanxi Journal of Agricultural Sciences

基　　金：广西自然科学基金项目(2024GXNSFAA010145);广西教育厅科研项目(2021KY0623);河池学院科研项目(2021GCC023);“桂西北特色植物资源开发与功能研究中心”研究平台。

摘　　要：为了探讨独角金内酯(SLs)对盐胁迫下玉米幼苗生长生理的影响。本试验以“郑单958”玉米幼苗为材料,用独角金内酯类似物GR24代替独脚金内酯进行研究,在河池学院植物生理材料培养室进行土壤盆栽试验,培养室平均温度28℃,平均相对湿度为70.85%。待玉米幼苗至三叶一心时进行相关指标的测定,试验共设4个处理:叶面喷施蒸馏水(CK1)、350 mmol/L NaCl+叶面喷施蒸馏水(CK2)、350 mmol/L NaCl+叶面喷施外源GR24,外源GR24的浓度分为1μmol/L(T1)、5μmol/L(T2)、10μmol/L(T3)和50μmol/L(T4)。结果表明:350 mmol/L的NaCl溶液胁迫处理,抑制了玉米幼苗的形态正常发育以及生理作用。与盐胁迫相比,外源喷施5μmol/L玉米幼苗株高、根长显著增加了15.71%、44.78%,相对含水量、叶绿素含量分别上升了36.76%、39.88%,丙二醛(MAD)含量降低了19.35%,POD、SOD活性、O_(2)^(·-)积累量降低。综上,当外源喷施5μmol/L独角金内酯时,对缓解盐胁迫下玉米幼苗的伤害有较好的作用。To investigate the effects of exogenous strigolactones(SLs)on the physiological responses of maize seedlings under salt stress,a soil pot experiment was conducted using‘Zhengdan 958’maize seedlings.The study used GR24,a synthetic analog of strigolactones,as the treatment agent.The experiment was conducted in a controlled cultivation chamber at Hechi University,with an average temperature of 28℃and a relative humidity of 70.85%.Physiological parameters were measured when the seedlings reached the three-leaf stage.Four treatments were applied:foliar spraying with distilled water(CK1),350 mmol/L NaCl combined with distilled water(CK2),and 350 mmol/L NaCl combined with exogenous GR24 at concentrations of 1μmol/L(T1),5μmol/L(T2),10μmol/L(T3),and 50μmol/L(T4).The results demonstrated that exposure to 350 mmol/L NaCl significantly inhibited the morphological development and physiological functions of maize seedlings.However,compared with the salt stress condition,exogenous application of 5μmol/L GR24 led to significant increases in plant height(by 15.71%)and root length(by 44.78%).The relative water content and chlorophyll content increased by 36.76%and 39.88%,respectively,while malondialdehyde(MDA)content decreased by 19.35%.Moreover,peroxidase(POD)and superoxide dismutase(SOD)activities,along with O_(2)^(·-) accumulation were reduced.These results indicate that the exogenous application of 5μmol/L GR24 effectively mitigates salt stress-induced damage in maize seedlings,which has its potential role in improving plant stress tolerance.

关 键 词：独角金内酯 盐胁迫 玉米幼苗 生理效应 

分 类 号：S513[农业科学—作物学]