摘要
为探究外源一氧化氮对黑麦草铝毒害的缓解作用,以铝敏感型黑麦草品种Nagahahikari和铝耐受型黑麦草品种特高为试验材料,研究不同浓度(100和200μmol/L)硝普钠(SNP)对20 mmol/L铝胁迫下两种黑麦草生长特性和生理指标的影响。结果表明:外源NO处理可提高黑麦草幼苗的OJIP荧光瞬态曲线,提高量子产率,量子效率,比能量通量,可溶糖含量,可溶性蛋白含量,显著提高叶绿素a含量,叶绿素总量,超氧化物歧化酶(SOD)活性,过氧化物酶(POD)活性和过氧化氢酶(CAT)活性(P<0.05),显著降低丙二醛(MDA)含量和相对电导率并降低黑麦草对铝的富集量(P<0.05)。和仅铝胁迫相比较,添加200μmol/L SNP,Nagahahikari和特高的相对电导率分别下降34.85%和27.35%,SOD活性分别提高28.66%和37.18%,POD活性分别提高52.41%和50.30%,地上部Al^(3+)富集量分别下降34.95%和29.33%,根系中Al^(3+)富集量分别下降26.02%和17.37%,添加100μmol/L SNP对两种黑麦草的生长和生理指标也有积极的影响,但效果弱于添加200μmol/L SNP。说明添加外源NO能够促进铝胁迫下黑麦草的生长和生物量的积累,且对铝敏感型品种Nagahahikari所受铝毒害的缓解效果优于铝耐受型“特高”。
The objective of this study was to investigate the alleviative effects of exogenous nitric oxide(NO)on aluminum(Al)toxicity in ryegrass seedlings.Ryegrass cv.Te Gao,Al-tolerant and cv.Nagahahikari,Al-sensitive were grown in sand to investigate the effects of two different concentrations(100,200μmol/L)of sodium nitroprusside(SNP)on the growth and physiological parameters of ryegrass undeR^(2)0 mmol/L Al^(3+).The results showed that exogenous NO treatment increased chlorophyll fluorescence parameters,soluble sugar content,soluble protein content,chlorophyll a content,total chlorophyll content,SOD activity,POD activity and CAT activity(p<0.05),while significantly reduced MDA content and electrical conductivity,and the accumulation of Al^(3+)in ryegrass(p<0.05).Compared with Al stress only,the application of 200μmol/L SNP under Al stress reduced the relative electricity conductivity by 34.85%and 27.35%,increased SOD activity by 28.66%and 37.18%and SOD activity by 52.41%and 50.30%,reduced Al^(3+)enrichment in shoots by 34.95%and 29.33%and in roots by 26.02%and 17.37%in Nagahahikari and Te Gao,respectively.The results indicated that the alleviative effects of NO treatment on the growth of ryegrass exposed to Al stress was more significant in the Al-sensitive ryegrass cv.Nagahahikari than that of Al-tolerant cv.Te Gao.
作者
张汉林
王琳
吴亚
王栋麟
刘大林
ZHANG Han-lin;WANG Lin;WU Ya;WANG Dong-lin;LIU Da-lin(College of Animal Science and Technology,Yangzhou University,Yangzhou 225009,China;Institutes of Agricultural Science and Technology Development,Yangzhou University,Yangzhou 225009,China)
出处
《草原与草坪》
CAS
CSCD
2021年第4期64-73,共10页
Grassland and Turf
基金
江苏现代农业产业体系建设项目[JATS(2020)446]。
关键词
铝胁迫
一氧化氮
黑麦草
生长特征
生理指标
aluminum stress
nitric oxide
ryegrass
growth characteristics
physiological parameters
