Consortium of plant growth‐promoting bacteria improves spinach (Spinacea oleracea L.) growth under heavy metal stress conditions

Abstract

BACKGROUND Heavy metal contamination results in oxidative stress to plants and leads to decreased plant growth and development. Affected plants cannot be efficiently used in phytoremediation studies and their potential may be significantly reduced. In many cases, bioaugmentation with plant growth‐promoting bacteria is used as a strategy to alleviate this stress condition. RESULTS Isolates were found to possess 1‐aminocyclopropane‐1‐carboxylate (ACC) deaminase, to produce indole‐3‐acetic acid (IAA) siderophores and to solubilize phosphates, while identification revealed that the isolates belonged to the genera Pseudomonas and Bacillus. Out of the 17 isolates, ten were found to possess ACC deaminase activity, producing 1–3.2 μmol mg−1 h−1 of α‐ketobutyrate and siderophores of catechol and hydroxamate type. A higher quantity of IAA was observed in the case of isolate SGPI 41 (65 μg mL−1). In addition, the inoculation of consortia of isolates led to decreased accumulation of Cd, Pb and Zn in the whole plant but at the same time increased the plant biomass by up to 100% compared with the un‐inoculated control. CONCLUSIONS The use of beneficial bacteria possessing plant growth‐promoting traits is a very useful approach to alleviating heavy metal stress to plants and can be successfully applied in phytoremediation strategies. © 2019 Society of Chemical Industry

Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants

“…In the present review, most of the authors reported IAA production by the beneficial bacteria, tolerant to salt (Table 1). This ability is expressed even in salinity stress conditions, which is a beneficial effect and a valuable result of the environmental adaptation [4,16,17,66,67].…”

Improving energy efficiency of Bacillus velezensis broth microfiltration in tubular ceramic membrane by air sparging and turbulence promoter

“…Today, agriculture often depends on chemical‐based pesticides and fertilizers for great quantity agricultural output. Environmental pollution and pesticide residual effects on human health, as well as on natural ecosystems, has led to the development of sustainable agriculture approaches . Microbial biopesticides offer environment‐friendly biotechnological alternatives to chemical control of plant diseases and pests …”

“…Environmental pollution and pesticide residual effects on human health, as well as on natural ecosystems, has led to the development of sustainable agriculture approaches. 1,2 Microbial biopesticides offer environment-friendly biotechnological alternatives to chemical control of plant diseases and pests. 3,4 Utilization of microorganisms or their metabolites in biological control of various plant pathogens represents a fast-growing sector.…”

In Focus: 7th European Bioremediation Conference (EBCVII)

“…In particular, Shilev et al . aimed to design and develop a strategy in order to alleviate the stress conditions induced by heavy metals . For that purpose a rhizosphere consortium of bacteria was isolated and was tested for its ability to promote the growth of spinach in heavy metal‐contaminated soils.…”

“…In particular, Shilev et al aimed to design and develop a strategy in order to alleviate the stress conditions induced by heavy metals. 5 For that purpose a rhizosphere consortium of bacteria was isolated and was tested for its ability to promote the growth of spinach in heavy metal-contaminated soils. Upon investigating various operational conditions, authors concluded that those bacteria may actually protect plants with a simultaneous decrease in metals accumulation.…”