Salinity stress responses in the plant growth promoting rhizobacteria,Azospirillum spp

Tripathi, Anil Kumar; Mishra, Bhuwan B.; Tripathi, Prajna

doi:10.1007/bf02936140

Cited by 41 publications

(16 citation statements)

References 42 publications

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“…Osmoregulation in the nitrogen fi xing rhizobacteria of the genus Azospirillum is well documented (Hartmann 1988 ;Riou and Le Rudulier 1990 ;Hartmann et al 1991Hartmann et al , 1992Riou et al 1991 ;Tripathi et al 1998 ). Bacteria of the genus Azospirillum accumulate compatible solutes such as gulatamate , proline , glycine betaine , trehalose in order to adapt to the fl uctuations in soil salinity.…”

Section: Strategy Of Osmoregulation In Halotolerant Bacteriamentioning

confidence: 97%

Application of Halotolerant Bacteria to Restore Plant Growth Under Salt Stress

Nabti

Schmid

Hartmann

2015

Sustainable Development and Biodiversity

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High salinity abolishes several stages of plant life ranging from the seed germination step to maturity. Many processes are inhibited, such as phytohormone synthesis and regulation, normal root and shoot development, nutrient uptake, photosynthesis, and DNA replication. Plant growth promoting bacteria (PGPB) are naturally colonizing plants and occur in the rhizosphere or non rhizosphere soil and benefi t plant growth by numerous processes. The importance of halotolerant PGPB resides in their ability to adapt to increased salinity by effi cient osmoregulatory mechanism to be able to continue regular cell functions. Thus, halotolerant PGPB are able to provide plants with their activities to challenge osmotic stress by supporting them in the restoration of essential activities, e.g., in their hormonal balance. Halotolerant PGPB stimulate plant growth under high salinity by using similar mechanisms like halosensitive PGPB, such as synthesis of indole acetic acid (IAA), gibberellins (GA), cytokinins (CK), abscisic acid (ABA), solubilization of insoluble phosphate , synthesis and excretion of siderophores , and production of ACCdeaminase to reduce high growth inhibitory levels of ethylene occurring in plants at salt stress conditions. Furthermore, some halotolerant PGPB are even able to colonize plants endophytically , produce various antimicrobial metabolites against pathogenic fungi and bacteria, support plant health by improving systemic resistance and contribute to soil fertility and remediation .

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Section: Strategy Of Osmoregulation In Halotolerant Bacteriamentioning

confidence: 97%

Application of Halotolerant Bacteria to Restore Plant Growth Under Salt Stress

Nabti

Schmid

Hartmann

2015

Sustainable Development and Biodiversity

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“…Although it is generally accepted that Tn5 transposition does not involve replication, there is evidence that Tn5 can have a replicative mechanism of transposition. Characterization of a DNA fragment with a Tn5 insertion in a regulatory nifA type gene of A. brasilense (Singh et al 1989) revealed that duplication of IS50 occurred at the Tn5 insertion site (Tripathi et al 1998). Nucleotide sequencing of the Tn5 insertion region proved that IS50 was duplicated, and that, together with the insertion event, a 484 bp sequence was deleted from the outside end of the internal IS50.…”

Section: Use Of Tn5 In Mutant Constructionmentioning

confidence: 99%

Azospirillum-plant relationships: physiological, molecular, agricultural, and environmental advances (1997-2003)

Bashan¹,

Holguín²,

de‐Bashan³

2004

Can. J. Microbiol.

826

441

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This review presents a critical and comprehensive documentation and analysis of the developments in agricultural, environmental, molecular, and physiological studies related to Azospirillum cells, and to Azospirillum interactions with plants, based solely on information published between 1997 and 2003. It was designed as an update of previous reviews (Bashan and Levanony 1990; Bashan and Holguin 1997a), with a similar scope of interest. Apart from an update and critical analysis of the current knowledge, this review focuses on the central issues of Azospirillum research today, such as, (i) physiological and molecular studies as a general model for rhizosphere bacteria; (ii) co-inoculation with other microorganisms; (iii) hormonal studies and re-consideration of the nitrogen contribution by the bacteria under specific environmental conditions; (iv) proposed Azospirillum as a non-specific plant-growth-promoting bacterium; (v) re-introduction of the "Additive Hypothesis," which suggests involvement of multiple mechanisms employed by the bacteria to affect plant growth; (vi) comment on the less researched areas, such as inoculant and pesticide research; and (vii) proposes possible avenues for the exploitation of this bacterium in environmental areas other than agriculture.

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“…Although some researchers informed that plants inoculated with A. brasilense show a better response against stress conditions, there is no information about the survival of this bacterium when it is grown in adverse environmental situations. However, it has been reported that Azospirillum accumulate compatible solutes as proline, glycine betaine, glutamate and trehalose to cope with osmotic stress (Tripathi et al, 1998;Yuwono, 2005;Rodriguez Salazar et al, 2009).…”

Section: Introductionmentioning

confidence: 95%

In vitro PGPR properties and osmotic tolerance of different Azospirillum native strains and their effects on growth of maize under drought stress

García¹,

Maroniche

Creus

et al. 2017

Microbiological Research

167

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Osmotic variations in the soil can affect bacterial growth diminishing the number of inoculated bacteria. In a scenario of water deficit having tolerant bacteria would be beneficial to achieve a better response of the plant to stress. Thus, selection of more resistant bacteria could be useful to design new inoculants to be used in arid zones. In this sense, a group of Azospirillum isolates deposited in INTA collection was characterized in order to select strains tolerant to osmotic stress. The results obtained demonstrated that Az19 strain has similar in vitro PGPR characteristics to Az39, the most used strain in Argentina for inoculants industries, with the advantage of a better tolerance to osmotic and salt stress. Inoculation of maize plants with this strain resulted in a better response against water deficit compared to Az39 strain, encouraging us to further study the behavior of this strain in greenhouse and field trials in view of developing new inoculants suitable for areas with water deficit.

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Salinity stress responses in the plant growth promoting rhizobacteria,Azospirillum spp

Cited by 41 publications

References 42 publications

Application of Halotolerant Bacteria to Restore Plant Growth Under Salt Stress

Application of Halotolerant Bacteria to Restore Plant Growth Under Salt Stress

Azospirillum-plant relationships: physiological, molecular, agricultural, and environmental advances (1997-2003)

In vitro PGPR properties and osmotic tolerance of different Azospirillum native strains and their effects on growth of maize under drought stress

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