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外源ABA对短期H2O2胁迫下侧柏幼苗活性氧代谢及相关基因的影响
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外源ABA对短期H2O2胁迫下侧柏幼苗活性氧代谢及相关基因的影响
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Journal Article
外源ABA对短期H2O2胁迫下侧柏幼苗活性氧代谢及相关基因的影响
2017
Overview
[目的] 研究外源ABA 处理对H2O2胁迫下侧柏幼苗活性氧代谢系统的影响，探讨ABA调控侧柏氧化胁迫的可能作用机制。[方法] 以侧柏幼苗为试验材料，采用水培方式，研究外施低浓度（0.5 μmol·L^-1）和高浓度（200 μmol·L^-1）ABA对100 mmol·L^-1 H2O2胁迫下侧柏幼苗活性氧代谢的影响。[结果] （1）100 mmol·L^-1 H2O2胁迫48 h 显著增加了侧柏幼苗叶片过氧化氢（H2O2）、丙二醛（MDA）、谷胱甘肽（GSH）和脯氨酸含量、抗氧化物酶（SOD和CAT）活性，而可溶性蛋白含量降低。（2）相较于高浓度200 μmol·L^-1 ABA，施加0.5 μmol·L^-1 ABA显著减少了H2O2胁迫下侧柏幼苗H2O2和MDA的积累，进一步提高了侧柏幼苗叶片SOD、POD和CAT活性，同时促进GSH、脯氨酸和可溶性蛋白的合成。（3）100 mmol·L^-1 H2O2胁迫处理48 h，侧柏幼苗叶片活性氧代谢相关基因Cu/Zn-SOD、CAT、GR、APX、MDAR和GST表达水平较对照CK均有显著性提高；正常和H2O2胁迫下侧柏幼苗外施0.5 μmol·L^-1 ABA相较于200 μmol·L^-1更有利于提高侧柏叶片活性氧代谢相关基因Cu/Zn-SOD、CAT、GR、APX、MDAR和GST的表达量。[结论] 低浓度0.5 μmol·L^-1 ABA有效地增强抗氧化系统的防御能力，减弱幼苗的氧化胁迫和膜脂过氧化水平，从而降低活性氧对侧柏的伤害。
