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Microbes have shown potential for the bioremediation of tannery waste polluted soil. During our previous study, it was observed that heavy metal resistant  Burkholderia cepacia  CS8 augmented growth and phytoremediation capability of an ornamental plant. Objective of the present research work was to evaluate the capability of  B. cepacia  CS8 assisted  Calendula officinalis  plants for the phytoremediation of tannery solid waste (TSW) polluted soil. The TSW treatment significantly reduced growth attributes and photosynthetic pigments in  C. officinalis . However, supplementation of  B. cepacia  CS8 which exhibited substantial tolerance to the TSW amended soil, augmented growth traits, carotenoid, proline, and antioxidant enzymes level in  C. officinalis  under toxic and nontoxic regimes. Inoculation of  B. cepacia  CS8 augmented plant growth (shoot length 13%, root length 11%), physiological attributes (chlorophyll  a  14%, chlorophyll  b  17%), antioxidant enzyme activities (peroxidase 24%, superoxide dismutase 31% and catalase 19%), improved proline 36%, phenol 32%, flavonoids 14% and declined malondialdehyde (MDA) content 15% and hydrogen peroxide (H 2 O 2 ) level 12% in  C. officinalis  at TSW10 stress compared with relevant un-inoculated plants of TSW10 treatment. Moreover,  B. cepacia  CS8 application enhanced labile metals in soil and subsequent metal uptake, such as Cr 19%, Cd 22%, Ni 35%, Fe 18%, Cu 21%, Pb 34%, and Zn 30%, respectively in  C. officinalis  plants subjected to TSW10 stress than that of analogous un-inoculated treatment. Higher plant stress tolerance and improved phytoremediation potential through microbial inoculation will assist in the retrieval of agricultural land in addition to the renewal of native vegetation.

Burkholderia cepacia CS8 improves phytoremediation potential of Calendula officinalis for tannery solid waste polluted soil