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| 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 |
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| DOI： |
| 中文关键词: 独角金内酯 盐胁迫 玉米幼苗 生理效应 |
| 英文关键词:Strigolactones Salt stress Maize seedlings Physiological response |
| 基金项目: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。 |
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| 中文摘要: |
| 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\+-[DD(X-*2]·[DD)]\-2积累量降低。综上，当外源喷施5 μmol/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。 |
| 英文摘要: |
| 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 1 μmol/L (T1), 5 μmol/L (T2), 10 μmol/L (T3), and 50 μmol/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 5 μmol/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\+-[DD(X-*2]·[DD)]\-2 accumulation were reduced. These results indicate that the exogenous application of 5 μmol/L GR24 effectively mitigates salt stress-induced damage in maize seedlings, which has its potential role in improving plant stress tolerance. |
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