Plants (Basel, Switzerland) · 2026
Dynamics of Rare Earth Element Uptake and Partitioning in Two Soybean Cultivars Under Background Soil Conditions.
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Chen Yaofu, Lu Jilong, Zhao Xinyun, Lu Peng, Cui Jiaxuan, Zhang Kaiyu, Qu Jiayu, Hou Yaru
Аннотация
BACKGROUND: Rare earth elements (REEs) are present in agricultural ecosystems, but their baseline soil-plant transfer dynamics require systematic understanding. This study investigated the 'source-to-sink' biogeochemical distribution of REEs in soybean under background soil conditions.
METHODS: We characterized REE concentrations and fractionation patterns in the composite surface soil samples and analyzed two soybean cultivars ('Jiyu 201' (JY) and 'Ping'an 16' (PA)). A seven-stage sampling scheme (20-80 days post-sowing) using whole-plant samples was employed to evaluate temporal concentration dynamics, followed by discrete organ-level analysis at maturity.
RESULTS: The composite surface soil samples exhibited a light REE (LREE)-enriched signature with negative cerium (Ce) and europium (Eu) anomalies. While plants consistently mirrored the soil's negative Eu anomaly, an observable shift toward a positive Ce anomaly was detected in plant tissues during the 45-65 days post-sowing window. REE concentrations were markedly higher in roots than in aerial tissues, indicating strong root-associated retention and limited acropetal translocation; however, the root values include both internalized and surface-associated fractions. Acropetal transport was accompanied by preferential LREE enrichment. Final organ-level partitioning was highly genotype-dependent: the indeterminate cultivar PA accumulated higher REEs in beans, whereas the sub-determinate cultivar JY retained them primarily in vegetative stems.
CONCLUSIONS: Under background soil conditions, REE uptake and partitioning in soybean exhibit dynamic and genotype-dependent patterns. The observed shift in the Ce anomaly presents a notable biogeochemical phenomenon. Establishing these baseline dynamics is vital for evaluating crop elemental homeostasis and utilizing REEs as biogeochemical tracers.
METHODS: We characterized REE concentrations and fractionation patterns in the composite surface soil samples and analyzed two soybean cultivars ('Jiyu 201' (JY) and 'Ping'an 16' (PA)). A seven-stage sampling scheme (20-80 days post-sowing) using whole-plant samples was employed to evaluate temporal concentration dynamics, followed by discrete organ-level analysis at maturity.
RESULTS: The composite surface soil samples exhibited a light REE (LREE)-enriched signature with negative cerium (Ce) and europium (Eu) anomalies. While plants consistently mirrored the soil's negative Eu anomaly, an observable shift toward a positive Ce anomaly was detected in plant tissues during the 45-65 days post-sowing window. REE concentrations were markedly higher in roots than in aerial tissues, indicating strong root-associated retention and limited acropetal translocation; however, the root values include both internalized and surface-associated fractions. Acropetal transport was accompanied by preferential LREE enrichment. Final organ-level partitioning was highly genotype-dependent: the indeterminate cultivar PA accumulated higher REEs in beans, whereas the sub-determinate cultivar JY retained them primarily in vegetative stems.
CONCLUSIONS: Under background soil conditions, REE uptake and partitioning in soybean exhibit dynamic and genotype-dependent patterns. The observed shift in the Ce anomaly presents a notable biogeochemical phenomenon. Establishing these baseline dynamics is vital for evaluating crop elemental homeostasis and utilizing REEs as biogeochemical tracers.