Arsenic uptake by Medicago truncatula: P supply and arbuscular mycorrhizal (AM) colonization do not reduce specific uptake from soil
We investigated the effects of phosphate (P) supply and arbuscular mycorrhizal (AM) colonization on arsenic (As) uptake by Medicago truncatula, grown in a soil/sand mix. Contrary to expectations we found no effects of increased P supply in reducing the rate of As uptake. We attribute the protective effect of P and of AM fungi to increased ability to extend roots and compensate for damage caused by As. Arsenic reduced AM colonization, but did not eliminate P uptake via the fungal pathway. We found no evidence that AM colonization increased the rate of As uptake by roots. We conclude that studies of mechanisms underlying As tolerance in solution culture may not always provide clear insights into mechanisms likely to operate in soil.
Arbuscular mycorrhiza arsenic Medicago phosphare soil
S. Pope S. E. Smith H. M. Christophersen F. A. Smith
Soil and Land Systems, School of Earth and Environmental Sciences, Waite Campus, The University of A Soil and Land Systems, School of Earth and Environmental Sciences, Waite Campus, The University of A
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
863-864
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）