氨基酸螯合镧(La(Ⅲ)-AA)对模拟酸雨胁迫下三种作物生理指标的影响

Effects of La(Ⅲ)-AA on Physiological Indicators of three crops under artificial acid rain stress

酸雨对农业生态系统中作物的影响,攸关粮食安全,抗酸(雨)减灾研究迫在眉睫.本文采用模拟酸雨污染盆栽实验方法,研究一种新型氨基酸螯合镧对酸雨胁迫下玉米、水稻、小麦等8项生理指标的影响.结果表明,与对照组相比预施氨基酸螯合镧能有效降低酸雨对3种作物叶片质膜透性(45.95%—54.22%)、超氧阴离子自由基产生速率(28.44%—42.31%)、丙二醛含量(31.03%—38.71%)、脯氨酸(36.23%—47.17%)含量及过氧化物酶活性(48.3%—57.92%)的影响,提高过氧化氢酶活性(29.43%—78.61%)、叶绿素含量(7.89%—18.76%)和氮代谢强度(21.37%—60.63%).由此可见,氨基酸螯合镧对酸雨胁迫下,作物的过氧化损伤具有一定防护效应,预喷氨基酸螯合镧可在一定程度上减轻酸雨污染对作物的伤害.

The impact of acid rain on crops is critical to food security,and reducing acid rain damage to crops is a top priority.In this paper,the effect of a novel amino acid chelated lanthanum La(Ⅲ)-AA on 8 physiological indices of three crops,Zea mays L.,Oryza sativa L.and Triticum aestivum L.were studied under simulated acid rain pollution.The results showed that pre-application of La(Ⅲ)-AA could effectively reduce the plasma membrane permeability(45.95%—54.22%),ROS production rate(28.44%—42.31%),malondialdehyde content(31.03%-38.71%),proline content(36.23%—47.17%)and peroxidase activity(48.3%—57.92%).Meanwhile,catalase activity(29.43%—78.61%),chlorophyll content(7.89%—18.76%)and nitrogen metabolism intensity(21.37%—60.63%)were increased.In conclusion,La(Ⅲ)-AA exhibits protective effect against the peroxidative stress caused by acid rain,and pre-spraying La(Ⅲ)-AA can reduce the damage of acid rain pollution to crops.