Ectomycorrhizas with Paxillus involutus enhance cadmium uptake and tolerance in Populus × canescens (pages 627–642)
YONGLU MA, JIALI HE, CHAOFENG MA, JIE LUO, HONG LI, TONGXIAN LIU, ANDREA POLLE, CHANGHUI PENG and ZHI-BIN LUO
Article first published online: 8 SEP 2013 | DOI: 10.1111/pce.12183
Ectomycorrhizas (EMs), which are symbiotic organs formed between tree roots and certain fungi, can mediate cadmium (Cd) tolerance of host plants, but the underlying physiological and molecular mechanisms are not fully understood. Populus × canescens was inoculated with or without Paxillus involutus (strain MAJ) and subsequently exposed to 0 or 50 μM CdSO4 . Higher net Cd2+ influx in EMs well corresponded to higher transcript levels of genes involved in Cd2+ uptake, transport and detoxification processes than those in nonmycorrhizal roots. Higher CO2 assimilation, improved nutrient and carbohydrate status, and alleviated oxidative stress were found in mycorrhizal compared to nonmycorrhizal poplars despite higher Cd2+ accumulation.