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交替氧化酶在麻疯树盐胁迫响应中的作用

, PP. 112-118

Keywords: 麻疯树,交替氧化酶,盐胁迫,胁迫损伤

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Abstract:

麻疯树耐贫瘠,能在降水量少、环境恶劣的地区种植,但麻疯树的抗逆机理至今尚未揭晓。研究了盐胁迫对麻疯树生长的影响以及交替氧化酶(AOX)在麻疯树盐胁迫响应中的作用。结果表明,麻疯树具有较强的耐盐性,200mmol/L和400mmol/LNaCl处理对麻疯树幼苗生长影响不大,叶片叶绿素含量和细胞含水量与对照组材料相比无明显差异。1mol/LNaCl处理时麻疯树生长减缓,气孔开度降低,但未表现出明显的胁迫损伤。盐胁迫条件下,AOX呼吸和AOX基因的转录水平明显上升。与对照组材料相比,AOX基因转录水平在200mmol/L和400mmol/LNaCl处理时上升近两倍,而在1mol/LNaCl处理时上升近3倍。结果表明,AOX可能在麻疯树盐胁迫应答过程中起关键作用,与减轻植株氧化损伤有关。

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