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Lysinibacillus sphaericus plant growth promoter bacteria and lead phytoremediation enhancer with Canavalia ensiformis
Author(s) -
Martínez Sergio A.,
Dussán Jenny
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12668
Subject(s) - canavalia ensiformis , phytoremediation , biology , biofertilizer , bacillus sphaericus , nitrifying bacteria , shoot , bacteria , horticulture , botany , microbial inoculant , nitrogen , chemistry , inoculation , soil water , ecology , nitrification , bacillales , genetics , organic chemistry , bacillus subtilis
Lysinibacillus sphaericus is known for its great larvicidal activity against mosquito larvae and toxic metal resistance, but knowledge about its possible activity in soil is scarce and poor. Nevertheless, in the genome of some strains have been reported genes of nitrogen cycle. Seven L. sphaericus strains were tested as nitrogen fixing bacteria, nitrifying bacteria, and indoleacetic acid producer. Subsequently a consortium was formulated using the best strains (CBAM5, III(3)7, OT4b.31, and OT4b.49) to evaluate its effect in Canavalia ensiformis growth and lead phytoremediation. All L. sphaericus strains were able to fix nitrogen (0.61–1.47 mg/L of ammonium), nitrify (0.26–0.7 mg/L of nitrate), and produce IAA (3.3–5.5 µg/mL in L‐tryptophan media and 0.3–1.1 µg/mL in trypticase broth). They also promoted shoot length, root length, foliar area, and leaf number in C. ensiformis, enhanced lead bioaccumulation in the root reaching a removal of 40% of lead in greenhouse experiment, and increased nitrate content in soil twofold in contrast to the control in field experiment. Therefore, L. sphaericus could be a key organism in the formulation of biofertilizers, as it shows potential in the phytoremediation processes, in crop plant nutrition, and growth in low nutrient polluted soils, then is a plant growth promoter bacteria (PGPB). © 2017 American Institute of Chemical Engineers Environ Prog, 37: 276–282, 2018