砷(As)胁迫对海滨雀稗As吸收特征及根系形态影响  

Effect of arsenic stress on arsenic uptake and root morphological changes in seashore paspalum

作　　者：陈晓明[1] 韩东英 宋桂龙[1] CHEN Xiao-ming;HAN Dong-ying;SONG Gui-long(Grassland Science College,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学草业与草原学院,北京100083

出　　处：《草业学报》2023年第6期112-119,共8页Acta Prataculturae Sinica

基　　金：深圳市铁汉生态环境股份有限公司(THRD008)资助。

摘　　要：采用盆栽试验研究了2个砷(As)浓度处理(10、100 mg·kg^(-1))对海滨雀稗5个部位[茎、新叶、老叶、粗根(D>0.5 mm)、细根(D<0.5 mm)]生长及富集特征的影响。结果表明:不同浓度As处理下,海滨雀稗各部位生长均表现为抑制,各部位的耐受性也发生了较大变化,最明显的是茎,表现出了低耐高不耐的特点,粗根在不同浓度下均表现出了较耐的特点;海滨雀稗各部位As含量表现为细根>粗根>茎>新叶>老叶,且差异显著;根系对As胁迫的响应体现在粗根生长受到促进,细根生长受到抑制,即随着As浓度的增加,D>0.5 mm径级根长、根表面积、根体积所占比例逐渐升高,D<0.5 mm径级所占比例下降。The effects of two arsenic(As)concentration treatments(10 and 100 mg·kg^(−1))on the growth and accumulative characteristics of five organs[stem,new leaf,old leaf,coarse root(diameter,D>0.5 mm)and fine root(D<0.5 mm)],of seashore paspalum(Paspalum vaginatum)were investigated in a pot experiment.It was found that:Under the high-As treatment,the growth of all organs of seashore paspalum was inhibited.The most obvious reduction was in the stem,which showed the characteristics of low tolerance and high intolerance.Coarse roots showed better As tolerance.The As content of plant tissue varied significantly between different seashore paspalum organs and was ranked fine roots>coarse roots>stems>new leaves>old leaves.The root response to As stress was that the growth of coarse roots was promoted and the growth of fine roots was inhibited.With increasing As concentration,the proportion of root length,root surface area and root volume of the D>0.5 mm root category gradually increased,while the proportion of diameter class D<0.5 mm decreased.

关 键 词：海滨雀稗 砷胁迫 根系形态 砷积累 

分 类 号：S688.4[农业科学—观赏园艺] X173[农业科学—园艺学]