摘要
通过水培试验,以不添加As处理为对照,探讨添加了 5.0、15.0、30.0 mg/L As(V)的培养液对ZQ5171、ZQ2000、ZQ16和ZQ18等 4个品种青稞幼苗生长发育的影响及As在青稞幼苗体内的积累分布特征.结果表明:As(V)处理后ZQ5171和ZQ2000 的株高、主根长和生物量受到了抑制,而ZQ16 和ZQ18的株高、主根长和生物量表现为"低促高抑"的现象;与对照相比,As处理后ZQ18的株高、主根长和生物量无显著下降,根冠比变小,根向茎转移As的能力较低,为耐As品种,而ZQ5171 和ZQ2000 生长受到明显毒害,为As敏感品种;青稞的根、茎、叶中As含量依次降低,分别为 149.84～748.47、1.81～234.71、3.82～141.49 mg/kg;除ZQ18外,其余品种青稞根中As的形态以As(V)为主,而茎和叶中以As(Ⅲ)为主.
Abstract
In this study,we applied culture medium supplemented with 5.0,15.0 and 30.0 mg/L As(V)to grow four highland barley seedlings,ZQ5171,ZQ2000,ZQ16 and ZQ18 and characterized the As accumulation and distribution using hydroponics experiments and the treatment without As as control to investigate the arsenic effects on the plants.The results showed that after As(V)treated the plant height,taproot length and biomass of ZQ5171 and ZQ2000 were inhibited,while the plant height,taproot length and biomass of ZQ16 and ZQ18 showed a phenomenon of"low promotion and high inhibition".Compared with the control treatment,the plant height,taproot length and biomass of ZQ18 did not decrease significantly after As treated,and the root-shoot ratios were smaller and the ability of root-to-stem transfer of As was lower,suggesting ZQ18 was an As-tolerant variety.Meanwhile the growth of ZQ5171 and ZQ2000 were obviously poisoned,indicating ZQ5171 and ZQ2000 were As-sensitive varieties.The As contents in the roots,stems and leaves of highland barley decreased successively,which were 149.84-748.47,1.81-234.71,3.82-141.49 mg/kg,respectively.Except for ZQ18,As(V)was the main form of As in the roots of the others highland barley,while As(Ⅲ)was the main form in the stems and leaves.
基金项目
西藏自治区重点科技计划(XZ202001ZY0048N)
现代农业产业技术体系建设专项(CARS-05)
国家科技期刊平台
NSTL
万方数据