Effect of salinity, gibberellic acid and Azospirillum inoculation on growth and nitrogen uptake of Zea mays

Hamdia,; El-Komy, Hesham M. A.

doi:10.1023/a:1000904819841

Cited by 33 publications

(7 citation statements)

References 39 publications

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“…GMKU 336 had less reduction of chlorophyll content. The result was similar to that with PGP Azospirillum 25 and ACCD-producing Bacillus 12 which significantly increased chlorophyll content in respective maize and rice grown in high salt conditions. Furthermore, salt stress significantly accelerated ethylene synthesis in all rice treatments.…”

Section: Discussionsupporting

confidence: 81%

Molecular interaction of 1-aminocyclopropane-1-carboxylate deaminase (ACCD)-producing endophytic Streptomyces sp. GMKU 336 towards salt-stress resistance of Oryza sativa L. cv. KDML105

Jaemsaeng

Jantasuriyarat

Thamchaipenet

2018

Sci Rep

117

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1-aminocyclopropane-1-carboxylate deaminase (ACCD)-producing endophytic Streptomyces sp. GMKU 336 and its ACCD-deficient mutant were inoculated into Thai jasmine rice Khao Dok Mali 105 cultivar (Oryza sativa L. cv. KDML105) under salt stress (150 mM NaCl) conditions. The results clearly indicated that Streptomyces sp. GMKU 336 significantly increased plant growth, chlorophyll, proline, K+, Ca+, and water contents; but decreased ethylene, reactive oxygen species (ROS), Na+, and Na+/K+ ratio when compared to plants not inoculated and those inoculated with the ACCD-deficient mutant. Expression profiles of stress responsive genes in rice in association with strain GMKU 336 were correlated to plant physiological characteristics. Genes involved in the ethylene pathway, ACO1 and EREBP1, were significantly down-regulated; while acdS encoding ACCD in Streptomyces sp. GMKU 336 was up-regulated in vivo. Furthermore, genes involved in osmotic balance (BADH1), Na+ transporters (NHX1 and SOS1), calmodulin (Cam1-1), and antioxidant enzymes (CuZn-SOD1 and CATb) were up-regulated; whereas, a gene implicated in a signaling cascade, MAPK5, was down-regulated. This work demonstrates the first time that ACCD-producing Streptomyces sp. GMKU 336 enhances growth of rice and increases salt tolerance by reduction of ethylene via the action of ACCD and further assists plants to scavenge ROS, balance ion content and osmotic pressure.

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Section: Discussionsupporting

confidence: 81%

Molecular interaction of 1-aminocyclopropane-1-carboxylate deaminase (ACCD)-producing endophytic Streptomyces sp. GMKU 336 towards salt-stress resistance of Oryza sativa L. cv. KDML105

Jaemsaeng

Jantasuriyarat

Thamchaipenet

2018

Sci Rep

117

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“…Interestingly, salt treatment reduced surface colonization, but not colonization inside the root (Fischer et al 2000). Azospirillum inoculation at NaCl concentrations up to -1.2 MPa significantly increased chlorophyll, K, Ca, soluble saccharides, and protein contents as compared with control plants growing without NaCl (Hamdia and El-Komy 1997), similar to alleviating water stress on wheat plants grown under drought conditions (El-Komy et al 2003). Inoculating A. brasilense on wheat seedlings exposed to severe salt (NaCl) or osmotic (polyethylene glycol) stresses significantly reversed part of the negative effects; both stresses reduced relative elongation rate of shoots.…”

Section: Salt Stressmentioning

confidence: 89%

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

Bashan¹,

Holguín²,

de‐Bashan³

2004

Can. J. Microbiol.

824

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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“…The most important microorganisms that play a significant role in soil fertility in tropical and temperate regions of the world and isolated from the rhizosphere of a diverse range of cereals, including corn, millet, sorghum, and wheat is Azospirillum sp. (Hamdia and El-Komy, 1998), play an important role in the promotion of plant growth (Steenhoudt and Vandeleyden 2000) and capable of affecting growth and yield of numerous plant species and its ability to produce various phytohormones that improve root growth adsorption of water, minerals that eventually yield larger and in many cases, more productive plants (Dobbelaerae et al 2003) and can also mineralize nutrients from the soil, sequester Fe, survive under harsh environmental conditions, and support beneficial mycorrhizal-plant associations (Bashan et al 2006). Azospirillum can help plants minimize the negative effects of abiotic stresses because, Azospirillum is the most studied PGPB and excluding rhizobia (Diaz-Zorita andFernandez-Canigia, 2009 andBashan, 2009), can survive in the absence of their host owing to the presence polyβ-hydroxybutyrate (PHB) (Okon and Itzigsohn 1992) and polysaccharide synthesis (Del Gallo and Idaegi, 1990) Inoculated wheat plants with salt-tolerant Azospirillum enhanced non-symbiotic nitrogen fixation capability in salinity soil by produces growth-promoting substances such as IAA, gibberellins, pantothenic acid, thiamine and niacin which promotes root proliferation and improve the plant growth and yield.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of salt-tolerant Azospirillum spp and its role in improvement of wheat growth parameter

El-Akhdar¹,

El‐Sheekh

Allam

et al. 2019

EBSS

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IGHTEEN isolates of Azospirillum were collected from different sites at Kafrelsheikh Governorate. The isolates were cultivated on nitrogen-free malate (NFM) medium supplemented with different NaCl g l-1 concentrations (0, 0.7 and 1.5%) and tryptophan to study the salt tolerant in vitro and indole acetic acid production. Pots were used to evaluate the most salt-tolerant and efficient species and soils of this experiment had artificially salinized with different salinity levels. The most salt-tolerant A 10 and A 11 species were genetically identified by 16S rRNA sequencing and the results revealed to be closest matched at 98% A. lipoferum strains and selected to inoculate wheat plants. The investigated A. lipoferum species had variable divergence growth at different salinity levels. Actually, increased salinity had deleterious effect on IAA production. In addition, salinity had deleterious effect on dry weights of plants, number and dry weight of branches, total chlorophyll, sodium and potassium% with increasing salinity levels. But, inoculation with associative nitrogen fixation A. lipoferum isolates enhanced the previous parameters. Thus, inoculation with the salt-tolerant A.lipoferum isolates decreased the deleterious effect of salt stress on wheat plants.

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Effect of salinity, gibberellic acid and Azospirillum inoculation on growth and nitrogen uptake of Zea mays

Cited by 33 publications

References 39 publications

Molecular interaction of 1-aminocyclopropane-1-carboxylate deaminase (ACCD)-producing endophytic Streptomyces sp. GMKU 336 towards salt-stress resistance of Oryza sativa L. cv. KDML105

Molecular interaction of 1-aminocyclopropane-1-carboxylate deaminase (ACCD)-producing endophytic Streptomyces sp. GMKU 336 towards salt-stress resistance of Oryza sativa L. cv. KDML105

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

Evaluation of salt-tolerant Azospirillum spp and its role in improvement of wheat growth parameter

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