砷胁迫对黑麦草根系形态及养分吸收的影响  

Effect of arsenic stress on root morphological parameters and absorption of nutrient elements in ryegrass

作　　者：李金波 李诗刚 宋桂龙[1] 濮阳雪华 薛博晗 隋永超 Li Jin bo;Li Shi-gang;Song Gui-long;Puyang Xue-hua;Xue Bo-han;Sui Yong chao(Institute of Turfgrass Science,Beijing Forestry University,Beijing 100083,China;Shcnzhcn Tcchand Ecology ＆ Environmcnt Co.,I.td,Shcnzhcn 518040,Guangzhou,China)

机构地区：[1]北京林业大学草坪研究所,北京100083 [2]深圳市铁汉生态环境股份有限公司,广州深圳518040

出　　处：《草业科学》2018年第6期1385-1392,共8页Pratacultural Science

基　　金：富集重金属草本植物筛选及修复潜力评估(THRD008)

摘　　要：黑麦草对重金属具有较强的耐性和富集能力,是一种良好的植物修复材料。为探究砷(As)胁迫下黑麦草的根系形态以及根系养分吸收特征,采用盆栽试验研究了100mg·kg^(-1) As胁迫下,多年生黑麦草(Lolium perenne)和一年生黑麦草(L.multiflorum)的根系形态和营养元素吸收情况,并分别对As吸收与根系形态和养分吸收做相关性分析。结果表明,多年生黑麦草总根长和总根表面积受抑制程度更加明显,分别降低47.6%和46.8%;多年生黑麦草根系As吸收能力是一年生黑麦草的1.2倍。As胁迫促进两种黑麦草根系对N、P、K、Mn元素的吸收,二者相比,多年生黑麦草根系吸收N、P、K三种大量元素受影响更大,而一年生黑麦草根系吸收微量元素Mn受影响更大。总体上看,多年生黑麦草的根系形态和养分吸收能力对As胁迫更加敏感。Ryegrass was regarded as a plant species with potential for phytoremediation owing to its stronger heavy metal tolerance and accumulate capacities.For exploring the root morphological parameters and absorption of nutrient elements characteristic of ryegrass under arsenic stress,apot experiment was performed.We studied the effect of 100 mg·kg^-1 arsenic（As）stress on root morphological parameters and nutrient elements absorption of perennial ryegrass（Lolium perenne）and annual ryegrass（Lolium multiflorum）,Moreover,we aimed to analyze the relationships of arsenic absorption with root morphological parameters and the content of nutrient elements.The results indicated that total length and total surface area of perennial ryegrass were reduced significantly by 47.6%and 46.8%,respectively,as compared with those of annual ryegrass.The absorbing capacity of As of perennial ryegrass root was 1.2 times greater than that of annual ryegrass.As stress promoted the absorption of N/P/K/Mn in two ryegrass species.Perennial ryegrass root had a greater effect on N/P/K absorption,whereas annual ryegrass root had a greater effect on Mn absorption.The root morphological parameters and nutrient absorption of perennial ryegrass was more sensitive to arsenic stress.

关 键 词：砷 一年生黑麦草 多年生黑麦草 根系形态 砷吸收 营养元素 相关性 

分 类 号：S816[农业科学—饲料科学] S543.603[农业科学—畜牧学]