褪黑素对大头菜幼苗生长及镉积累的影响  

Effects of Melatonin on Growth and Cadmium Accumulation of Brassica juncea var. megarrhiza

作　　者：姚欢 王铤[3] 刘磊[3] 岁立云[3] 廖明安[1] 林立金[4] 任纬 YAO Huan;WANG Ting;LIU Lei;SUI Liyun;LIAO Ming’an;LIN Lijin;REN Wei(College of Horticulture,Sichuan Agricultural University,Chengdu 611130,China;College of Life Sciences,Sichuan University,Chengdu 610064,China;Chengdu Academy of Agriculture and Forestry Sciences,Chengdu 611130,China;Institute of Pomology and Olericulture,Sichuan Agricultural University,Chengdu 611130,China;Institute of Maize Research,Neijiang Academy of Agricultural Sciences,Neijiang,Sichuan 641000,China)

机构地区：[1]四川农业大学园艺学院,成都611130 [2]四川大学生命科学学院,成都610064 [3]成都市农林科学院,成都611130 [4]四川农业大学果蔬研究所,成都611130 [5]四川省内江市农业科学院玉米研究所,四川内江641000

出　　处：《土壤》2019年第5期1001-1005,共5页Soils

基　　金：四川省教育厅项目(17ZB0342)资助

摘　　要：通过盆栽试验,研究了Cd污染条件下,不同浓度褪黑素喷施对大头菜幼苗生长及Cd积累的影响。结果表明,浓度50、100和150μmol/L的褪黑素增加了大头菜幼苗的根长、根系体积、株高、块根直径和块根长度,也增加了其根系、块根、地上部分及可食用部分的生物量,而浓度为200μmol/L的褪黑素则降低了大头菜幼苗的这些指标。不同浓度的褪黑素处理均提高了大头菜幼苗的光合色素(叶绿素a、叶绿素b、叶绿素总量及类胡萝卜素)含量及抗氧化酶(SOD、POD和CAT)活性,并降低了大头菜幼苗根系、块根、地上部分和可食用部分的Cd含量。随着褪黑素浓度的增加,大头菜幼苗各器官的Cd含量呈降低的趋势。因此,喷施褪黑素能够促进大头菜幼苗生长,降低其对Cd的积累。A pot experiment was conducted to study the effects of different concentrations of melatonin on the growth and cadmium(Cd)accumulation of Brassica juncea var.megarrhiza under Cd-contaminated condition.The concentrations of 50,100 and 150μmol/L melatonin increased the root length and volume,plant height,tuber diameter and length of B.juncea var.megarrhiza seedlings,and increased the biomass of roots,tubers,shoots and edible parts,while 150μmol/L melatonin decreased these items.Different concentrations of melatonin improved the photosynthetic pigment(chlorophyll a,chlorophyll b,total chlorophyll and carotenoid)contents and antioxidant enzyme(SOD,POD and CAT)activities of B.juncea var.megarrhiza seedlings,while reduced Cd contents in roots,tubers,shoots and edible parts of plant seedlings.With the increase of melatonin concentration,Cd contents in the different organs of B.juncea var.megarrhiza seedlings showed the reducing trend.Therefore,the spraying of melatonin could promote the growth of B.juncea var.megarrhiza seedlings and reduce its accumulation of cadmium.

关 键 词：褪黑素 大头菜 生长 镉 

分 类 号：S482.891[农业科学—农药学] X503[农业科学—植物保护]