| 严加坤，严 荣，汪亚妮.外源茉莉酸甲酯对盐胁迫下玉米根系吸水的影响[J].广东农业科学,2019,46(1):1-6 |
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外源茉莉酸甲酯对盐胁迫下玉米根系吸水的影响 |
| Impact of Exogenous Methyl Jasmonate on Water Absorption of Maize Roots Under Salt Stress |
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| DOI：10.16768/j.issn.1004-874X.2019.01.001 |
| 中文关键词: 茉莉酸 盐胁迫 根系水力学导度 水通道蛋白 玉米 |
| 英文关键词: Jasmonic acid salt stress root hydraulic conductance aquaporin maize |
| 基金项目:陕西省陕北矿区生态修复重点实验室开放基金（KFXM201803, ZZXM201802, KFXM201807）；榆林学院高层次人才项目（17GK19, 17GK18） |
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| 中文摘要: |
| 【目的】茉莉酸作为一种重要的植物激素在植物应答生物胁迫及非生物胁迫中起到重要作用。然
而以往针对茉莉酸提高植物非生物胁迫的研究主要集中在茉莉酸提高植物抗氧化能力来提高植物抗性的研究，
而其对植物水分平衡的影响研究相对较少。【方法】通过水培（1/4 Hoaglands 营养液）条件下外源施加茉莉酸
甲酯（1 μmol/L）处理解析短期（2 h）盐（100 mmol/L）胁迫下茉莉酸对玉米根系吸水能力的影响，以期为玉
米抗盐碱育种提供理论依据。【结果】外源施加茉莉酸甲酯分别提高盐胁迫下根系生物量 41.32%，地上部生
物量 40.69%；同时，对生理指标分析发现：外源施用茉莉酸甲酯能有效提高盐胁迫下玉米净光合速率（47.48%）、
蒸腾速率和叶水势及叶相对含水量等叶片相关生理指标；盐胁迫下玉米高根系水力学导度（相比非茉莉酸处理
提高 41.60%）对维持高蒸腾速率与叶相对含水量起到重要作用。此外，通过外源氯化汞抑制试验表明茉莉酸
甲酯处理下高的根系水力学导度与水通道蛋白活性显著相关。【结论】盐胁迫下茉莉酸能够通过调控玉米根系
水通道蛋白活性提高玉米根系水力学导度从而提高玉米根系吸水能力进而维持茉莉酸处理下玉米高的叶面蒸腾
速率及高的叶片相对含水量。 |
| 英文摘要: |
| 【Objective】Jasmonic acid (JA) , as an important plant hormone, plays an important role in plants’
response to biological stress and abiotic stress. However, the previous researches on the improvement of plant abiotic stress
in JA acid mainly focused on JA to improve the antioxidant ability of plants to improve plant resistance, and its effect on
plant water balance was relatively few. Although exogenous JA application is known to enhance plant stress tolerance, the
underlying mechanisms involved in this process are still poorly understood.【Method】The influence of methyl jasmonate
(MeJA, 1 μmol/L) on water absorption of maize roots under short-term (2h) salt (100 mmol//L) stress was analyzed by
applying the methyl jasmonate (1 μmol/L) in an exogenous manner under hydroponics (1/4 Hoaglands nutrient solution)
conditions in order to provide a theoretical basis for salt-alkali-resistant maize breeding.【Result】Exogenous methyl
jasmonate improved the root biomass and aboveground biomass by 41.32% and 40.69% respectively under salt stress.
Moreover, physiological indicator analysis showed that exogenous methyl jasmonate significantly enhanced the physiological
indicators of leaves such as net photosynthetic rate (47.48%), transpiration rate, leaf water potential, relative water content of leaf under salt stress; high root hydraulic conductivity (increased by 41.60% compared with non-jasmonate condition) played an
important role in maintaining high transpiration rate and relative water content of leaf under salt stress. In addition, exogenous
mercuric chloride inhibition test indicated that, under methyl jasmonate conditions, the high root hydraulic conductivity
correlated significantly with the aquaporin activity. 【Conclusion】Under salt stress, jasmonate could improve the root
hydraulic conductivity of maize by regulating the aquaporin activity in maize roots, thus maintaining high leaf transpiration rate
and relative water content of leaf under jasmonate conditions by increasing the water absorption of maize roots. |
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