褪黑素对镉胁迫条件下毛桃幼苗生长及镉含量的影响  

Effects of melatonin on the growth and cadmium contents of peach seedlings under cadmium stress

作　　者：张地莲 肖云英 李婉 周万木 张晓丽 林立金[2] 唐懿[2] 胡容平[1] ZHANG Dilian;XIAO Yunying;LI Wan;ZHOU Wanmu;ZHANG Xiaoli;LIN Lijin;TANG Yi;HU Rongping(Institute of Plant Protection,Sichuan Academy of Agricultural Sciences/Key Laboratory of Integrated Crop Pest Management in Southwest China,Ministry of Agriculture,Chengdu 610066,China;College of Horticulture,Sichuan Agricultural University,Chengdu 611130,China)

机构地区：[1]四川省农业科学院植物保护研究所/农业部西南作物有害生物综合治理重点实验室,四川成都610066 [2]四川农业大学园艺学院,四川成都611130

出　　处：《江苏农业学报》2025年第3期573-579,共7页Jiangsu Journal of Agricultural Sciences

基　　金：国家现代农业产业技术体系四川水果创新团队项目(SCCXTD-2024-04);四川农业大学本科生科研兴趣培养计划项目(2023505)。

摘　　要：为明确褪黑素对镉胁迫下毛桃生长的影响,本研究拟分析1 mg/L镉胁迫下施用不同浓度褪黑素(50μmol/L、100μmol/L、150μmol/L、200μmol/L)和不施褪黑素处理对毛桃幼苗生长及镉含量的影响。结果表明,1 mg/L镉胁迫能降低毛桃幼苗生物量、株高和部分光合色素含量,提高抗氧化酶活性。镉胁迫下,150μmol/L和200μmol/L褪黑素处理的毛桃幼苗生物量和株高显著高于不施褪黑素处理,其中,150μmol/L褪黑素处理的效果最好,毛桃幼苗根系生物量、地上部生物量及株高分别较不施褪黑素处理提高14.74%、23.48%和5.35%。100μmol/L、150μmol/L和200μmol/L褪黑素处理的毛桃幼苗叶绿素a含量和叶绿素b含量均高于不施褪黑素处理,150μmol/L褪黑素处理的类胡萝卜素含量高于不施褪黑素处理。不同浓度褪黑素处理的毛桃幼苗超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)活性均低于不施褪黑素处理。50μmol/L褪黑素处理的毛桃幼苗根系和地上部镉含量分别较不施褪黑素处理降低23.87%和34.39%,其他浓度褪黑素处理的毛桃幼苗根系和地上部镉含量则比不施褪黑素处理有所增加或无显著差异。因此,1 mg/L镉胁迫下,高浓度(150μmol/L和200μmol/L)褪黑素处理能够促进毛桃生长,而50μmol/L褪黑素处理能够降低毛桃的镉积累量。In order to clarify the effect of melatonin on the growth of peach under cadmium stress,an experiment was designed to analyze the effects of different concentrations of melatonin(50μmol/L,100μmol/L,150μmol/L,200μmol/L)and no melatonin treatment on the growth and cadmium content of peach seedlings under 1 mg/L cadmium stress.The results showed that 1 mg/L cadmium stress could reduce the biomass,plant height and partial photosynthetic pigment content of peach seedlings,and increase the activities of antioxidant enzymes.Under cadmium stress,the biomass and plant height of peach seedlings treated with 150μmol/L and 200μmol/L melatonin were significantly higher than those without melatonin treatment.Among them,the effect of 150μmol/L melatonin treatment was the best,and the root biomass,aboveground biomass and plant height of peach seedlings were 14.74%,23.48%and 5.35%higher than those without melatonin treatment,respectively.The chlorophyll a and chlorophyll b contents of peach seedlings treated with 100μmol/L,150μmol/L and 200μmol/L melatonin were higher than those of no melatonin treatment,and the carotenoid content of 150μmol/L melatonin treatment was higher than that of no melatonin treatment.The activities of superoxide dismutase(SOD),catalase(CAT)and peroxidase(POD)in peach seedlings treated with different concentrations of melatonin were lower than those without melatonin treatment.The cadmium contents in roots and shoots of peach seedlings treated with 50μmol/L melatonin were 23.87%and 34.39%lower than those without melatonin treatment,respectively.The cadmium contents in roots and shoots of peach seedlings treated with other concentrations of melatonin were increased or weren’t significantly different from those without melatonin treatment.Therefore,under 1 mg/L cadmium stress,high concentrations(150μmol/L and 200μmol/L)of melatonin treatments can promote the growth of peach,while 50μmol/L melatonin treatment can reduce the cadmium accumulation of peach.

关 键 词：褪黑素 镉胁迫 镉积累 毛桃 生长 

分 类 号：S662.1[农业科学—果树学] X505[农业科学—园艺学] S482.8[环境科学与工程—环境工程]