Effects of Rhizobium inoculation on cobalt accumulation and tolerance in the Australian pasture legume Tri f olium subterraneum L
Cobalt (Co) is an essential element for Rhizobia of legume pastures, and can improve their nodulation status as well as N-fixation. Additional Co has been applied into the soils to increase the Co content in pastures for improving animal nutrition. A comparative study of Co accumulation and toxicity in the pasture legume species Trifoliurn subterraneum L. was carried out for a Rhizobium-inoculated treatment and a uninoculated treatment in a pot experiment. The results indicated that inoculation can increase Co accumulation in both shoots and roots of T. subterraneum, but most of Co accumulated was localized in the roots in both treatments. Based on biomass yield, the growth stimulation for the uninoculated treatment was only observed in the root with a 3 μM Co addition, and stress was observed at higher Co concentrations for both shoots and roots. By contrast, the Co concentration that caused stress for the inoculated seedlings was about 10-fold higher than that for uninoculated seedlings. Analyses of the photosynthesis activity and chlorophyll contents also showed that Rhizobiurn inoculation could increase Co tolerance in T. subterraneum.
cobalt metal toxicity plant metal accumulation Rhizobium Tri folium subterraneum
M. Lei Y. D. Wang A. J. M. Baker
Applied Ecology Research Group, School of Botany, The University of Melbourne, Victoria 3010, Austra Applied Ecology Research Group, School of Botany, The University of Melbourne, Victoria 3010, Austra
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
625-626
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）