5 Fluorescent Pseudomonads …
117
Competition for Fe can be considered as occurring in two stages (a) competition
for the metal by the siderophores and (b) competition between the microorganism
particularly fluorescent pseudomonas for the Fe-siderophore complex, The former
is controlled by proton dissociation and formation constant of each siderophores as
well as by their concentration and kinetics of exchange, while the latter is governed
by existence of an uptake mechanism for, and its affinity to, the Fe complex (Edouard
et al. 1992). Soil salinity and acidity also alter the soil characteristics which negatively
affects the Fe uptake of pseudomonads, which influence the nutrient uptake of plant
community. Saline and acidic tolerant pseudomonads have to compensate in this with
improved osmo-tolerance and could play a pivotal role in the benefit to the plants
grown in saline soils, in better growth, colonization, and yield. A potential application
of microbial inoculants to improve crop growth and yield in saline environments is
a potential strategy for saline soil agriculture. Plant root exudates mainly amino
acids, organic acids, and sugars have a positive role in colonization of fluorescent
pseudomonas in the microenvironment of the plant root system. A consortium of
different PGPRs with known functions that could act symbiotically as they offer
multiple modes of action, with variability. The data presented in this article supports
that some saline acidic tolerant pseudomonads which are intrinsically less available
to rhizosphere utilizes the Fe in faster rates with their siderophores which is an
important finding as one of the parameters in reducing the availability of Fe to
other microorganisms in the rhizosphere. Interaction between these soil fluorescent
pseudomonads colonizing on the rhizosphere and rhizoplane of plant root system will
progress to harness, thus, improving the general health growth, yield of the plant,
and overcoming the stress.
References
Acosta-Motos JR, Ortuno M F, Bernal-Vicente A, Diaz-Vivancos P, Sanchez-Blanco MJ, Hernandez
JA. (2017) Plant responses to salt stress: adaptive mechanisms. Agronomy, pp 1– 38
Aeron A, Maheshwari DK, Meena VS (2020) Endophytic bacteria promote growth of the medicinal
legume Clitoria ternatea L. by chemotactic activity. Arch Microbiol 1–10. https://doi.org/10.
1007/s00203-020-01815-0
Ameixa OMCC, Marques B, Fernandes VS, Soares AMVM, Calado R, Lillebø AI (2016) Dimorphic seeds of Salicorniaramosissima display contrasting germination responses under different
salinities. EcolEng 87:120–12
Andrews SC, Robinson AK, Rodríguez-Quiñones F (2003) Bacterial iron homeostasis. FEMS
Microbiol Rev 27:215–237. https://doi.org/10.1016/S0168-6445(03)00055-X
Backer R, Rokem JS, Ilangumaran G, Lamont J, Praslickova D, Ricci E, Subramanian S, Smith
DL (2018) Plant growth-promoting rhizobacteria: context, mechanisms of action, and roadmap
to commercialization of biostimulants for sustainable agriculture. Front Plant Sci 9:1473
Bakker AW, Schippers B (1987) Microbial cyanide production in the rhizosphere in relation to
potato yield reduction and Pseudomonas spp mediated plant stimulation. Soil Biol Biochem
19(4):451–457
Bakker PAHM, Bakker AW, Marugg JD, Peter JW, Schippers B (1987) A bio-assay for studying
the role of siderophores in potato growth stimulation by Pseudomonas spp in V.; short potato
rotations. Soil Biol Biochem 19:443–449
117
Competition for Fe can be considered as occurring in two stages (a) competition
for the metal by the siderophores and (b) competition between the microorganism
particularly fluorescent pseudomonas for the Fe-siderophore complex, The former
is controlled by proton dissociation and formation constant of each siderophores as
well as by their concentration and kinetics of exchange, while the latter is governed
by existence of an uptake mechanism for, and its affinity to, the Fe complex (Edouard
et al. 1992). Soil salinity and acidity also alter the soil characteristics which negatively
affects the Fe uptake of pseudomonads, which influence the nutrient uptake of plant
community. Saline and acidic tolerant pseudomonads have to compensate in this with
improved osmo-tolerance and could play a pivotal role in the benefit to the plants
grown in saline soils, in better growth, colonization, and yield. A potential application
of microbial inoculants to improve crop growth and yield in saline environments is
a potential strategy for saline soil agriculture. Plant root exudates mainly amino
acids, organic acids, and sugars have a positive role in colonization of fluorescent
pseudomonas in the microenvironment of the plant root system. A consortium of
different PGPRs with known functions that could act symbiotically as they offer
multiple modes of action, with variability. The data presented in this article supports
that some saline acidic tolerant pseudomonads which are intrinsically less available
to rhizosphere utilizes the Fe in faster rates with their siderophores which is an
important finding as one of the parameters in reducing the availability of Fe to
other microorganisms in the rhizosphere. Interaction between these soil fluorescent
pseudomonads colonizing on the rhizosphere and rhizoplane of plant root system will
progress to harness, thus, improving the general health growth, yield of the plant,
and overcoming the stress.
References
Acosta-Motos JR, Ortuno M F, Bernal-Vicente A, Diaz-Vivancos P, Sanchez-Blanco MJ, Hernandez
JA. (2017) Plant responses to salt stress: adaptive mechanisms. Agronomy, pp 1– 38
Aeron A, Maheshwari DK, Meena VS (2020) Endophytic bacteria promote growth of the medicinal
legume Clitoria ternatea L. by chemotactic activity. Arch Microbiol 1–10. https://doi.org/10.
1007/s00203-020-01815-0
Ameixa OMCC, Marques B, Fernandes VS, Soares AMVM, Calado R, Lillebø AI (2016) Dimorphic seeds of Salicorniaramosissima display contrasting germination responses under different
salinities. EcolEng 87:120–12
Andrews SC, Robinson AK, Rodríguez-Quiñones F (2003) Bacterial iron homeostasis. FEMS
Microbiol Rev 27:215–237. https://doi.org/10.1016/S0168-6445(03)00055-X
Backer R, Rokem JS, Ilangumaran G, Lamont J, Praslickova D, Ricci E, Subramanian S, Smith
DL (2018) Plant growth-promoting rhizobacteria: context, mechanisms of action, and roadmap
to commercialization of biostimulants for sustainable agriculture. Front Plant Sci 9:1473
Bakker AW, Schippers B (1987) Microbial cyanide production in the rhizosphere in relation to
potato yield reduction and Pseudomonas spp mediated plant stimulation. Soil Biol Biochem
19(4):451–457
Bakker PAHM, Bakker AW, Marugg JD, Peter JW, Schippers B (1987) A bio-assay for studying
the role of siderophores in potato growth stimulation by Pseudomonas spp in V.; short potato
rotations. Soil Biol Biochem 19:443–449