Characterization of root morphology and root-derived low molecular weight organic acids in two sweet potato cultivars exposed to cadmium
文献类型： 外文期刊
作者： Xin, Junliang 1 ; Huang, Baifei 1 ; Dai, Hongwen 1 ; Mu, Yangxiu 2 ;
作者机构： 1.Hunan Inst Technol, Sch Safety & Environm Engn, Res Ctr Environm Pollut Control Technol, Hengyang, Peoples R China
2.Ningxia Acad Agr & Forestry Sci, Inst Agr Resource & Environm, Yinchuan, Peoples R China
关键词： Ipomoea batatas (L.) Lam.;root feature;root exudates;low-Cd cultivar
期刊名称：ARCHIVES OF AGRONOMY AND SOIL SCIENCE （ 影响因子：3.092； 五年影响因子：2.745 ）
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收录情况： SCI
摘要： The mechanisms of low cadmium (Cd) accumulation in sweet potato cultivars are obscure. In this study, seedlings of a low-Cd (Nan88, N88) and a high-Cd cultivar (Xiang 16, X16) were grown in Hoagland's solution containing Cd concentrations of 0 (control), 1 (Cd-1), and 10 mu M (Cd-10) for 20 days. We analyzed the Cd accumulation, root morphology and low molecular weight organic acids (LMWOAs) excreted by the root tips (RTs). The total root length (RL) and specific root length (SRL) in X16 were greater than those in N88 following Cd treatments. In the Cd-1 treatment, RL and surface area for root diameter was <= 0.2 mm, and RTs in X16 were also greater than those in N88. LMWOAs excreted from the RTs initially increased and then decreased as Cd concentration increased. The RTs of N88 were more efficient at excreting organic acids than were those of X16. The low-Cd cultivar with lower RL and SRL displayed greater ability to excrete organic acids in Cd treatments, which can decrease Cd translocation from roots to shoots. Furthermore, root morphology and some LMWOAs released from the root tips played an important role in the differing rates of Cd accumulation in the two sweet potato cultivars.
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