Abstract
Cadmium (Cd) phytotoxicity in agricultural land is a major global concern now-a-days resulting in very poor yield. Plant growth-promoting rhizobacteria (PGPR)-mediated bioremediation is one of the convenient strategies for detoxification of Cd from the soil and for plant growth promotion under Cd stress. The selected strain K5 was identified as Klebsiella pneumoniae based on MALDI-TOF MS ribosomal protein and 16S rDNA sequence-based homology. The strain possessed several PGP traits viz. IAA production (3413 μg/mL), phosphate solubilization (80.25 ppm), ACC deaminase activity (40 ng α-ketobutyrate/mg protein/h), N2 fixation ability (1.84 μg N2 fixed/h), etc. and has the highest Cd resistance (4000 μg/mL) among Cd-resistant PGPR so far reported. This strain efficiently accumulated Cd and remained viable under Cd stress as confirmed by AAS-TEM-EDX analysis and viability test, respectively. The significant (p < 0.05) positive effect of the strain was reflected in various plant growth parameters like increased seed germination (50 to 90%), root length (5-fold), shoot length (about 2-fold), root fresh weight (> 2-fold), and shoot fresh weight (1.23-fold) under Cd stress compared with uninoculated set. Moreover, the positive impact of this strain on antioxidant enzyme activity (CAT, MDA, SOD) and several other biochemical parameters (proline, α-amylase, protease, total sugar, total protein, chlorophyll content) were also measured that favors plant growth promotion under Cd stress. Besides, the K5 strain also decreased stress-ethylene level under Cd stress and reduction of Cd accumulation in seedling (> 1.5-fold) was conducive to alleviate Cd phytotoxicity. Hence, K. pneumoniae strain K5 can be used as a phytostimulating and Cd-bioremediating biofertilizer for sustainable agriculture in heavy metal-contaminated sites.
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Abbreviations
- PGPR:
-
Plant growth-promoting rhizobacteria
- PGP traits:
-
Plant growth-promoting traits
- GC:
-
Gas chromatography
- ACC:
-
1-aminocyclopropane-1-carboxylic acid
- CAT:
-
Catalase
- MDA:
-
Malondialdehyde
- SOD:
-
Superoxide dismutase
- ROS:
-
Reactive oxygen species
- MAP kinase:
-
Mitogen-activated protein kinase
- MALDI-TOF MS:
-
Matrix-assisted laser desorption/ionization mass spectrometry
- TEM:
-
Transmission electron microscopy
- EDX:
-
Energy dispersive X-ray spectroscopy
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The first author is thankful to the Department of Science and Technology, New Delhi, Government of India, for awarding the DST-INSPIRE fellowship (Reg. No.:IF150197).
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Pramanik, K., Mitra, S., Sarkar, A. et al. Characterization of cadmium-resistant Klebsiella pneumoniae MCC 3091 promoted rice seedling growth by alleviating phytotoxicity of cadmium. Environ Sci Pollut Res 24, 24419–24437 (2017). https://doi.org/10.1007/s11356-017-0033-z
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DOI: https://doi.org/10.1007/s11356-017-0033-z