Improvement of cadmium phytoremediation after soil inoculation with a cadmium-resistant Micrococcus sp.

Abstract

Cadmium-resistant Micrococcus sp. TISTR2221, a plant growth-promoting bacterium, has stimulatory effects on the root lengths of Zea mays L. seedlings under toxic cadmium conditions compared to uninoculated seedlings. The performance of Micrococcus sp. TISTR2221 on promoting growth and cadmium accumulation in Z. mays L. was investigated in a pot experiment. The results indicated that Micrococcus sp. TISTR2221significantly promoted the root length, shoot length, and dry biomass of Z. mays L. transplanted in both uncontaminated and cadmium-contaminated soils. Micrococcus sp. TISTR2221 significantly increased cadmium accumulation in the roots and shoots of Z. mays L. compared to uninoculated plants. At the beginning of the planting period, cadmium accumulated mainly in the shoots. With a prolonged duration of cultivation, cadmium content increased in the roots. As expected, little cadmium was found in maize grains. Soil cadmium was significantly reduced with time, and the highest percentage of cadmium removal was found in the bacterial-inoculated Z. mays L. after transplantation for 6 weeks. We conclude that Micrococcus sp. TISTR2221 is a potent bioaugmenting agent, facilitating cadmium phytoextraction in Z. mays L.

Microbial Endophytes that Live within the Seeds of Two Tomato Hybrids Cultivated in Argentina

“…Actinobacteria like Micrococcus and Microbacterium are frequently present within the rhizosphere of plants, suggesting that they play a crucial role and promote plant growth while interacting with plants [55]. Sangthong et al [56] found that representatives of the Micrococcus sp. promoted the root and shoot length, as well as the shoot biomass of Zea mays L. The isolate proved to be a potent bioaugmenting agent, facilitating cadmium phytoextraction in Z. mays L. Prapagdee et al [57] found that Microccocus sp.…”

An indoleacetic acid-producingOchrobactrumsp. MGJ11 counteracts cadmium effect on soybean by promoting plant growth

“…TISTR2221 can facilitate cadmium phytoremediation in Z. mays L. by increasing cadmium accumulation in tissues (Sangthong et al . ). In the present study, Ochrobactrum sp.…”

“…TISTR2221 facilitated Cd phytoextraction in Zea mays L. (Sangthong et al . ). Inoculating Lupinus luteus with heavy metal‐resistant PGPB increased both nitrogen content and biomass and decreased the metal accumulation in situ (Dary et al .…”

Bacterial Endophytes of Spring Wheat Grains and the Potential to Acquire Fe, Cu, and Zn under Their Low Soil Bioavailability

“…There are reports concerning PGPB Micrococcus sp. from other plant sources, for example, TISTR2221, i.e., a cadmium-resistant strain from Helianthus annuus L., which produces a high level of IAA during the late stationary growth phase and increases the root length of maize seedlings under cadmium stress [ 152 , 153 ]. Raza and Faisal [ 154 ] found that M. luteus -chp37 inoculation increases the number of leaves, shoot length, root length, and weight of maize plants.…”