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Pseudomonas fluorescens promote photosynthesis, carbon fixation and cadmium phytoremediation of hyperaccumulator Sedum alfredii
- Source :
- Wu, Y, Ma, L, Liu, Q, Sikder, M M, Madsen, M V, Zhou, K, Wang, Q, Yang, X & Feng, Y 2020, ' Pseudomonas fluorescens promote photosynthesis, carbon fixation and cadmium phytoremediation of hyperaccumulator Sedum alfredii ', Science of the Total Environment, vol. 726, 138554 . https://doi.org/10.1016/j.scitotenv.2020.138554
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Plant growth-promoting bacteria (PGPB) can promote photosynthesis and biomass production of hyperaccumulators, achieving enhanced phytoremediation efficiency of cadmium (Cd). A better understanding of the mechanisms controlling photosynthesis of hyperaccumulating plants by PGPB is necessary for developing strategies that promote the practical phytoextraction of Cd-polluted soils. In this study, chlorophyll fluorescence, gas exchange, and transcriptome sequencing were conducted to evaluate the physiological and transcriptional changes on photosynthesis and carbon fixation in hyperaccumulator Sedum alfredii after inoculation with PGPB Pseudomonas fluorescens. The results showed that bacterial inoculation significantly enhanced maximum quantum yield of PS II (Fv/Fm), effective quantum yield of PS II (ΦPSII), photochemical quenching (qP) and chlorophyll concentration, while reduced non-photochemical quenching (NPQ) of S. alfredii. Further, inoculation resulted in an increased net photosynthetic rates (Pn), intercellular CO 2 concentration (Ci), transpiration rate (Tr) and stomatal conductance (Gs) of the studied plant. At the transcriptional level, 70 photosynthetic genes and 42 C4-pathway carbon fixation related genes were significantly up-regulated in response to inoculation, which could be the reason for enhanced photosynthesis and dry biomass. To sum up, this P. fluorescens strain can simultaneously promote growth and Cd uptake of S. alfredii, which can be a promising bacterial agent applied to Cd phytoremediation practices.
- Subjects :
- Chlorophyll
Stomatal conductance
Environmental Engineering
010504 meteorology & atmospheric sciences
Pseudomonas fluorescens
010501 environmental sciences
Photosynthesis
Plant Roots
01 natural sciences
Sedum
Carbon Cycle
Environmental Chemistry
Hyperaccumulator
Waste Management and Disposal
Chlorophyll fluorescence
0105 earth and related environmental sciences
biology
Chemistry
Carbon fixation
Plant growth-promoting bacteria
biology.organism_classification
Pollution
Horticulture
Phytoremediation
Biodegradation, Environmental
Heavy metal
Sedum alfredii
Transcriptome
Cadmium
Subjects
Details
- ISSN :
- 00489697
- Volume :
- 726
- Database :
- OpenAIRE
- Journal :
- Science of The Total Environment
- Accession number :
- edsair.doi.dedup.....83fb7de73b724c94dcdc458f1941c212