Enhancing cadmium extraction potential of Brassica napus: Effect of rhizosphere interactions

Brassica napus L. (oilseed rape) was grown with daikon and white lupin in a polyvinyl chloride split pot experiment (with no barrier between the compartments or by a nylon mesh barrier (37 mu m) to license partial root interaction, or a solid barrier to stop any root interactions) to examine the effect of rhizosphere interaction on the cadmium uptake. The results showed that shoot and root biomasses of oilseed rape were 40.66% and 26.94% less than that of the monocropped treatment (solid barrier) when intercropping with daikon under the rhizosphere complete interaction. However, the intermingling of roots between oilseed rape and white lupin notably enhanced the dry biomass of oilseed rape by 40.23% and decreased with the reduction of root contact. Oilseed rape intercropping with daikon enhanced the shoot Cd concentration of oilseed rape. The shoot Cd concentration (44.8 mg/kg) of oilseed rape when intercropped white lupin under complete rhizosphere interaction were greater than those of other treatments. Additionally, the intermingling of mots played a positive role in the content of citric and malic acids when intercmpping with white lupin. In all systems, the BCF values of oilseed rape >5. Therefore, intercropping with white lupin may contribute to higher biomass and increased uptake Cd by oilseed rape. We can toward sustainable positive effects on phytoremediation that based on a better understanding of rhizosphere processes.

Automated summary

The study found that intercropping oilseed rape with daikon resulted in decreased shoot and root biomass, while intercropping with white lupin increased the dry biomass of oilseed rape. Intercropping with daikon enhanced the shoot Cd concentration of oilseed rape, while intercropping with white lupin increased the uptake of Cd by oilseed rape. The results suggest that intercropping with white lupin may contribute to higher biomass and increased Cd uptake by oilseed rape.