Plant growth stimulation of wheat (Triticum aestivum L.) by inoculation of salinity tolerant Azotobacter strains

Chaudhary, Deepika; Narula, Neeru; Sindhu, S. S.; Behl, R. K.

doi:10.1007/s12298-013-0178-2

Cited by 48 publications

(25 citation statements)

References 27 publications

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“…The chlorophyll and the potassium contents were improved while the concentrations of amino acids, proline and sodium were reduced. These results were reported by many authors (Nadeem et al, 2006;Chaudhary et al, 2013). According to Glick et al (1998), the use of PGPR (for example, Pseudomonas) as inoculant of wheat seeds in saline soils improved the plant height, root length, the grain yield, chlorophyll content and the ratio K + /Na + .…”

Section: Discussionsupporting

confidence: 69%

“…According to Glick et al (1998), the use of PGPR (for example, Pseudomonas) as inoculant of wheat seeds in saline soils improved the plant height, root length, the grain yield, chlorophyll content and the ratio K + /Na + . The role of Azotobacter in the production of growth-promoting substances and plant improving resistance to abiotic and biotic stresses must also be considered (Chaudhary et al, 2013;Sahoo et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

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Growing varieties durum wheat (Triticum durum) in response to the effect of osmolytes and inoculation by Azotobacter chroococcum under salt stress

Silini¹,

Cherif‐Silini²,

Yahiaoui³

2016

Afr. J. Microbiol. Res.

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This study was conducted to determine the effect of plant growth promoting rhizobacteria Azotobacter chroococcum AZ6 isolated from arid soil and osmolytes such as glycine betaine (GB) or proline (P) on the growth of durum wheat varieties under salinity stress. Inoculation by A. chroococcum AZ6 in the presence or absence of P (5 mM) or GB (5 mM) reduced substantially the effect of salt stress on plant growth parameters such as root length, plant height, fresh shoot and root weight and dry shoot and root weight. The differences between the two varieties were low but with a fresh and dry weight higher in Waha. The rate of Na + accumulation in the roots and the shoots was important up to 100 mM and increased at 200 mM. The K + concentration and chlorophyll content decreased but proline and amino acid contents were enhanced with increasing salinity. Treatment by inoculation in the presence or absence of osmolytes improved the chlorophyll (a and total) and the K + concentrations and reduced intracellular proline accumulation and amino acids contents. Also, as result, the use of A. chroococcum AZ6 and osmolytes treatment may provide a means of improving tolerance of durum wheat to salt stress.Key words: Durum wheat, salinity, osmolytes, Azotobacter chroococcum, INTRODUCTIONSalinity and aridity are major environmental constraints limiting the growth and productivity of crops. In arid and semi-arid areas of the world, rainfall is inadequate for the leaching of salts from the root zone. Accordingly, the soluble salts are accumulated in the soil surface with the Na + as a dominant cation. Soil salinity presents a growing threat to agriculture and causes salinization of arable land on the planet. One third of arable land resources in the world are affected by salinity (Munns, 2002). Losses in crop yields in saline areas are important. High concentrations of salts cause ion imbalance and hyperosmotic stress in plants leading to cellular dehydration. The osmotic potential resulting from high concentrations of the Na + in the soil prevents the absorption of water which causes a variety of structural, biochemical and physiological seed changes and reduces the rate of germination causing a delay in the development of the plant (Poljakoff-Mayeber et al., 1994). Several experiments have been attempted to reduce the drastic effect of salt stress in the growth and productivity of plants. Most work focuses on the development of saltresistant varieties. Thus, efforts to reproduce genotypes which are highly salt tolerant are hampered by a lack of understanding the complex nature of tolerance. Plant tolerance seems to be based on a number of mechanisms, many of which are based on physiological processes such as transport mechanisms that reduce or eliminate the Na + and the Cl -of xylem (Tester and Davenport, 2003). Indeed, these varieties have developed various biochemical and physiological mechanisms against this type of stress. Such mechanism, ubiquitous in plants, is the accumulation of some organic metabolites of low molecular weigh...

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Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Growing varieties durum wheat (Triticum durum) in response to the effect of osmolytes and inoculation by Azotobacter chroococcum under salt stress

Silini¹,

Cherif‐Silini²,

Yahiaoui³

2016

Afr. J. Microbiol. Res.

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“…Inoculation of maize with Azotobacter strains has been shown to have general positive effects under saline stress by facilitating uptake of K + and exclusion of Na + as well as increasing phosphorous and nitrogen availability [24]. In wheat, inoculation of salt tolerance Azobacter strains increased biomass, nitrogen content, and grain yield under salt stress [25].…”

Section: Microorganisms Affecting Stress Tolerancementioning

confidence: 99%

The role of biostimulants and bioeffectors as alleviators of abiotic stress in crop plants

Oosten

Pepe

Pascale

et al. 2017

Chem. Biol. Technol. Agric.

622

399

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The use of bioeffectors, formally known as plant biostimulants, has become common practice in agriculture and provides a number of benefits in stimulating growth and protecting against stress. A biostimulant is loosely defined as an organic material and/or microorganism that is applied to enhance nutrient uptake, stimulate growth, enhance stress tolerance or crop quality. This review is intended to provide a broad overview of known effects of biostimulants and their ability to improve tolerance to abiotic stresses. Inoculation or application of extracts from algae or other plants have beneficial effects on growth and stress adaptation. Algal extracts, protein hydrolysates, humic and fulvic acids, and other compounded mixtures have properties beyond basic nutrition, often enhancing growth and stress tolerance. Non-pathogenic bacteria capable of colonizing roots and the rhizosphere also have a number of positive effects. These effects include higher yield, enhanced nutrient uptake and utilization, increased photosynthetic activity, and resistance to both biotic and abiotic stresses. While most biostimulants have numerous and diverse effects on plant growth, this review focuses on the bioprotective effects against abiotic stress. Agricultural biostimulants may contribute to make agriculture more sustainable and resilient and offer an alternative to synthetic protectants which have increasingly falling out of favour with consumers. An extensive review of the literature shows a clear role for a diverse number of biostimulants that have protective effects against abiotic stress but also reveals the urgent need to address the underlying mechanisms responsible for these effects.

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“…These strains were inoculated in earthen pots containing saline soil under greenhouse conditions. The results of rhizosphere soil monitoring showed that the concentration of the inoculated strains increased up to 60 days of sampling (Chaudhary et al, 2013; Table 1). However, this approach did not allow the identification of microorganisms present in the culture at genus and species level in nonsterile condition.…”

Section: Greenhousementioning

confidence: 99%

Effectiveness of Plant Beneficial Microbes: Overview of the Methodological Approaches for the Assessment of Root Colonization and Persistence

2020

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Plant growth stimulation of wheat (Triticum aestivum L.) by inoculation of salinity tolerant Azotobacter strains

Cited by 48 publications

References 27 publications

Growing varieties durum wheat (Triticum durum) in response to the effect of osmolytes and inoculation by Azotobacter chroococcum under salt stress

Growing varieties durum wheat (Triticum durum) in response to the effect of osmolytes and inoculation by Azotobacter chroococcum under salt stress

The role of biostimulants and bioeffectors as alleviators of abiotic stress in crop plants

Effectiveness of Plant Beneficial Microbes: Overview of the Methodological Approaches for the Assessment of Root Colonization and Persistence

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