作物杂志,2018, 第5期: 121126 doi: 10.16035/j.issn.1001-7283.2018.05.019
王嘉楠,李小艳,魏石美,赵会杰,赵明奇,汪月霞
Wang Jianan,Li Xiaoyan,Wei Shimei,Zhao Huijie,Zhao Mingqi,Wang Yuexia
摘要:
为了探究5-氨基乙酰丙酸(5-aminolevulinic acid,5-ALA)对干旱胁迫下小麦幼苗光合作用损伤的缓解机制,选用矮抗58小麦品种为试验材料,在两叶一心期对叶片喷施浓度为100mg/L的5-ALA,处理3d后对根部施加20%聚乙二醇6000(PEG-6000)模拟干旱环境,2d后取样进行光合以及psbA基因表达分析和D1蛋白含量测定。结果表明,干旱胁迫明显降低了小麦叶片的相对含水量以及叶绿素含量,而喷施外源5-ALA能够明显缓解干旱造成的伤害,同时也减缓了干旱胁迫下小麦幼苗净光合速率(Pn)、实际光化学效率(ΦPSⅡ)、原初光化学效率(Fv/Fm)和光化学猝灭系数(qP)值的降低,以及非光化学猝灭系数(qN)值的升高,并且提高了psbA基因表达水平和D1蛋白的含量。以上结果显示,喷施外源5-ALA可缓解干旱胁迫下小麦幼苗的光合性能,同时诱导psbA基因表达水平提高,加快新D1蛋白的合成与受损D1蛋白的降解,从而提高小麦幼苗的干旱胁迫耐受性。
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