摘要
铝毒是酸性土壤中抑制植物生长和产量的主要因子,但其对橡胶幼苗生长的影响研究甚少。本研究设置50、100、200 mmol/L 3种Al3+处理浓度,采用水培试验研究了铝胁迫下橡胶幼苗叶片叶绿素含量、叶片相对含水量、根系活力、根系导水率、H2O2和O2‒含量变化。结果表明:叶片SPAD值、叶片相对含水量、根系活力、根系导水率随胁迫时间的延长而逐渐降低,H2O2和O2‒含量则逐渐增加,且浓度越高对各个指标的影响越显著。铝毒害可造成根系活性氧(H2O2和O2‒)的累积,进而造成根系活力和导水率下降,叶片SPAD值和相对含水量下降,最终导致橡胶幼苗死亡。
Aluminum toxicity is a main factor that inhibits plant growth and productivity in acid soils,leaf relative water content,root activity,root hydraulic conductivity,H2O2,and O2‒content were studied by hydroponic experiments.The results showed that the leaf SPAD value,leaf relative water content,root activity and root hydraulic conductivity gradually decreased with the prolonged stress time,and the contents of H2O2 and O2‒gradually increased,the higher the concentration,the more significant impact of each index.Taking together,the results showed that aluminum could cause the accumulation of active oxygen species(H2O2 and O2‒)in the rubber tree root system,which in turn led to a decreased in root activity and water hydraulic conductivity,resulting in a decrease in leaf SPAD value and relative water content,and eventually the death of rubber tree saplings.
作者
张婷婷
刘子凡
安锋
谢贵水
ZHANG Tingting;LIU Zifan;AN Feng;XIE Guishui(College of Tropical Crops,Hainan University,Haikou,Hainan 570228,China;Danzhou Investigation&Experiment Station of Tropical Crops,Ministry of Agriculture and Rural Affairs/Rubber Research Institute,Chinese Academy of Tropical Agricultural Sciences,Haikou,Hainan 571101,China)
出处
《热带作物学报》
CSCD
北大核心
2020年第12期2439-2445,共7页
Chinese Journal of Tropical Crops
基金
2019年海南省基础与应用基础研究计划(自然科学领域)高层次人才项目(No.2019RC326)
国家自然科学基金项目(No.31670633)
海南省研究生创新科研课题(No.Hys2019-148)。
关键词
铝毒
橡胶苗
SPAD值
根系活力
根系导水率
活性氧
aluminum toxicity
rubber tree saplings
SPAD value
root activity
root hydraulic conductivity
active oxygen species
