TY - EJOU
AU - Jiang, Yuying
AU - Huang, Renhua
AU - Jiang, Lei
AU - Chen, Ke
AU - Zhu, Wenkun
TI - Alleviation of Cadmium Toxicity to Medicago Truncatula by AMF Involves the Changes of Cd Speciation in Rhizosphere Soil and Subcellular Distribution
T2 - Phyton-International Journal of Experimental Botany
PY - 2021
VL - 90
IS - 2
SN - 1851-5657
AB - Arbuscular mycorrhizal fungi (AMF) can improve plant tolerance to several abiotic stresses, including heavy
metals, drought or salinity exposure. However, the role of AMF in alleviation of soil cadmium (Cd)-induced toxicity to plants is still largely unknown. In this study, Cd speciation in soil and subcellular distribution of Cd were
used to characterize the roles of application AM fungi in the alleviation of Cd toxicity in alfalfa plants. Our results
showed that the addition of Glomus mosseae in Cd contaminated soil (10 mg/Kg) significantly increased soil pH,
cation exchange capacity (CEC) and organic matter in rhizosphere soil with Medicago truncatula L., and then
account for significantly decreased contents of exchangeable and carbonate-bounded Cd speciation in rhizosphere
soil, indicating alleviation of plant toxicity by reduction of bioavailable fractions of Cd. Although there is no significant difference found in Cd accumulation by roots and shoots respectively between Cd and AM-Cd treatments, more portion of Cd was recorded compartmentalization in cell wall fraction of both root and shoot in
treatment of Cd with AM application, indicating alleviation of Cd toxicity to plant cell. Herein, application of
AM fungi in Cd treatments performed to inhibit the appearance of Cd toxicity symptoms, including the improvement of leaf electrolyte leakage, root elongation, seedling growth and biomass. This information provides a clearer
understanding of detoxification strategy of AM fungi on Cd behavior with development and stabilization of soil
structure and subcellular distribution of plant.
KW - AM fungi; cadmium toxicity; Cd form; subcellular compartmentalization; phytoremediation
DO - 10.32604/phyton.2021.014376