赤霉素对盐胁迫诱导黍子幼苗根氧化损伤的影响  

Effects of Gibberellin on Oxidative Injury in Root of Broomcorn Millet Seedling in NaCl Stressed

作　　者：王金香 幸丽璇 王艳芝 周利青[1] 王志超[1] WANG Jinxiang;XIN Lixuan;WANG Yanzhi;ZHOU Liqing;WANG Zhichao(College of Agriculture and Life Science,Shanxi Datong University/Protected Agricultural Technology Development Center,Datong,Shanxi 037009,China)

机构地区：[1]山西大同大学农学与生命科学学院/设施农业技术研发中心,山西大同037009

出　　处：《天津农业科学》2022年第11期1-6,共6页Tianjin Agricultural Sciences

基　　金：山西大同大学博士科研项目(2010-B-12);山西大同大学校级项目(2020CXZ12)。

摘　　要：为探究盐胁迫对黍子幼苗根生长和氧化损伤的影响及外施赤霉素(GA_(3))对盐诱导氧化损伤的缓解作用,‘绿宝’糯黍子用不同浓度的NaCl及NaCl和GA_(3)共同处理。结果表明:NaCl抑制根和芽的生长,根冠比下降;根中过氧化氢酶(CAT)活性下降,过氧化物酶(POD)活性升高,H_(2)O_(2)、MDA含量和电导率显著升高。NaCl胁迫同时添加GA_(3),显著促进根的生长,根中CAT活性显著升高,POD活性恢复至对照水平,H_(2)O_(2)和MDA含量及电导率均低于单盐胁迫组。综上,NaCl胁迫诱导活性氧积累和氧化损伤是NaCl抑制根生长的主要原因。GA_(3)可缓解NaCl胁迫对根生长的抑制作用,降低氧化胁迫对根的次生危害,提高‘绿宝’糯黍子的耐盐性。The present study was designed to explore the NaCl-induced oxidative damage and the alleviation role of GA_(3) against oxidative stress caused by NaCl in the'Lübao'glutinous millet seedling.The results showed that NaCl significantly inhibited the growth of roots and buds,and decreased the root-shoot ratio.NaCl also decreased CAT activity,while it increased the POD activity in the seedling root.The contents of H_(2)O_(2) and MDA and electrical conductivity increased significantly in salt stressed,indicating that NaCl caused oxidative damage.There results showed that GA_(3) plus NaCl significantly promoted root growth,increased the CAT activity but suppressed H_(2)O_(2) production,MDA content and electrical conductivity compared to NaCl alone.In conclusion the severe oxidative damage was one of the cause of the adverse influence of NaCl on roots growth.GA_(3) could alleviate the inhibition of salt stress on roots growth and improve salt tolerance of'Lübao'glutinous millet.

关 键 词：黍子 盐胁迫 GA_(3) H_(2)O_(2) 氧化还原状态 MDA 电导率 

分 类 号：Q945[生物学—植物学]