ES4: Candidate Plant Growth-promoting Bacterium to Enhance Establishment of Plants in Mine Tailings

Overview

Journal Environ Exp Bot

Specialty Biophysics

Date 2014 Jul 11

PMID 25009362

Citations 14

Authors

Luz E de-Bashan

Juan-Pablo Hernandez

Yoav Bashan

Raina Maier

Affiliations

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Abstract

Three plant growth-promoting bacteria (PGPB; ES4, RIZO1, and Cd) were tested for their ability to enhance plant growth and development of the native Sonoran Desert shrub quailbush () and for their effect on the native bacterial community in moderately acidic, high-metal content (AHMT) and in neutral, low metal content natural tailings (NLMT) in controlled greenhouse experiments. Inoculation of quailbush with all three PGPB significantly enhanced plant growth parameters, such as germination, root length, dry weight of shoots and roots, and root/shoot ratio in both types of tailings. The effect of inoculation on the indigenous bacterial community by the most successful PGPB ES4 was evaluated by denaturating gradient gel electrophoresis (PCR-DGGE) fingerprinting and root colonization was followed by specific fluorescent in situ hybridization (FISH). Inoculation with this strain significantly changed the bacterial community over a period of 60 days. FISH analysis showed that the preferred site of colonization was the root tips and root elongation area. This study shows that inoculation of native perennial plants with PGPB can be used for developing technologies for phytostabilizing mine tailings.

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