Azospirillum lipoferum strain AZm5 containing 1-aminocyclopropane-1-carboxylic acid deaminase improves early growth of tomato seedlings under nitrogen deficiency

Bradyrhizobium sp. strain SUTN9‐2 was confirmed as rice endophytic bacteria and also as rice growth promotion agent. SUTN9‐2 showed the capability of plant growth promotion characteristics, such as indole‐3‐acetic acid (IAA) and 1‐amino‐cyclopropane‐1‐carboxylic acid (ACC) deaminase productions and nitrogen fixation. In this study, the ability of SUTN9‐2 to stimulate rice growth was investigated at different stages with N‐free and NH4NO3 under in vivo condition. The rice dry weight and chlorophyll content could be enhanced when SUTN9‐2 was inoculated in N‐free, especially at seedling stage (7 and 14 dai). The rice dry weight was also increased when SUTN9‐2 was inoculated with NH4NO3 at 7 and14 dai. The results of quantitative analysis of IAA and ACC deaminase were inconsistent with the expression of genes involved in IAA (nit) and ACC deaminase (acdS) productions. This inconsistently could implied that IAA and ACC deaminase produced from SUTN9‐2 do not directly affect rice growth, but other factors resulting from the production of IAA and ACC deaminase could be involved. Moreover, the expression of genes involved in nitrogen fixation (nifH and nifV) of SUTN9‐2 was also induced in rice tissues. This finding suggested that rice growth promotion may be supported by NH4NO3 together with nitrogen fixation by SUTN9‐2. Significance and Impact of the Study Indole‐3‐acetic acid, 1‐amino‐cyclopropane‐1‐carboxylic acid deaminase productions and nitrogen fixation may play important roles in rice growth promotion by endophytic SUTN9‐2, especially at early rice seedling growth stage, which has the potential to be used as rice seedling growth promoter in the system of rice intensification.

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“…(Esquivel‐Cote et al . ). These may support the effect of ACC from rice and nitrogen source on the expression of acdS gene.…”

Section: Resultsmentioning

confidence: 97%

Empowering rice seedling growth by endophytic Bradyrhizobium sp. SUTN 9‐2

Greetatorn

Hashimoto

Sarapat

et al. 2019

Lett Appl Microbiol

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“…In the absence of salt stress, most fertilized plants showed higher SLA than control plants (Fig. ), indicating a better physiological status ( i.e ., investment in photosynthetic surface; Esquivel‐Cote et al, ). However, during salt stress all plants invested in thicker leaves (lower SLA) to minimize water loss, as previously reported under stressful conditions ( Potters et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…The specificity range of host‐PGPR interactions seems to be quite broad as many of these bacteria share common mechanisms of interaction with plants ( Drogue et al, ). Numerous studies combine the effect of PGPR on tomato plants with environmental or biological stresses such as drought ( Calvo‐Polanco et al, ), salinity ( Mayak et al, ), nutrient deficit in soils ( Esquivel‐Cote et al, ) or pathogens ( Chen et al, ). Among environmental stresses, soil salinization represents a major problem that affects croplands worldwide causing important crop yield losses ( Dodd and Pérez‐Alfocea , ).…”

Section: Introductionmentioning

confidence: 99%

Inoculation of tomato plants with selected PGPR represents a feasible alternative to chemical fertilization under salt stress

Cordero

Balaguer

Rincón

et al. 2018

J. Plant Nutr. Soil Sci.

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Plant growth‐promoting rhizobacteria (PGPR) are soil bacteria that colonize the rhizosphere of plants, enhance plant growth, and may alleviate environmental stress, thus constituting a powerful tool in sustainable agriculture. Here, we compared the capacity of chemical fertilization to selected PGPR strains to promote growth and alleviate salinity stress in tomato plants (Solanum lycopersicum L.). A pot experiment was designed with two main factors: fertilization (chemical fertilization, bacterial inoculation with seven PGPR, or a non‐fertilized non‐inoculated control) and salt stress (0 or 100 mM NaCl). In the absence of stress, a clear promotion of growth, a positive effect on plant physiology (elevated Fv/Fm), and enhanced N, P, and K concentrations were observed in inoculated plants compared to non‐fertilized controls. Salinity negatively affected most variables analyzed, but inoculation with certain strains reduced some of the negative effects on growth parameters and plant physiology (water loss and K+ depletion) in a moderate but significant manner. Chemical fertilization clearly exceeded the positive effects of inoculation under non‐stressed conditions, but conversely, biofertilization with some strains outperformed chemical fertilization under salt stress. The results point at inoculation with selected PGPR as a viable economical and environment‐friendly alternative to chemical fertilization in salinity‐affected soils.

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“…Esquivel-Cote et al ( 2010 ) showed the potential of A. lipoferum to stimulate plant growth under different nitrogen levels (0, 170 and 340 kg N⋅ha −1 ). A better effect was observed when A. lipoferum AZm5 was inoculated in presence of a moderate nitrogen amount of 170 kg N⋅ha −1 (Esquivel-Cote et al 2010 ). Azospirillum allows a better plant resistance to heavy metal stress (Belimov et al 2004 ).…”

Section: Alleviation Of Abiotic Stresses By Azospirillummentioning

confidence: 99%

Alleviation of Abiotic and Biotic Stresses in Plants by Azospirillum

Vacheron

Renoud

Müller

et al. 2015

Handbook for Azospirillum

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In the face of global changes, plants must adapt to a wide range and often combined biotic and abiotic stresses that seriously impaired plant growth and development. Plants develop complex strategies to deal with water stress conditions, soil fertility losses, soil pollutions, pests, and disease. Emerging evidence suggest the involvement of common hormonal players in plant defense signaling pathways triggered in response to biotic and abiotic stresses. Besides plant strategies, plant growth-promoting rhizobacteria (PGPR), which colonize the root system and establish cooperative interactions with plants can improve their growth and help them to adapt to and cope with multiple stresses including drought, salinity, heavy metal pollutions, and parasites. Accordingly, PGPR supply added values to the plant defense strategies by expressing many relevant functions for modulating the plant hormonal balance, increasing nutrients supply to the plant, improving the functional and phy sical properties of protective barriers against plant parasites. Among PGPR, Azospirillum strains were long viewed as biofertilizers and less as biocontrol agents. It is becoming evident that Azospirillum is able to protect plants against a myriad of detrimental conditions. This review provides an update of works regarding the ability of Azospirillum strains to alleviate plant stress and brings out the relevant involved plant-benefi cial functions. Developing PGPR-based bio-inoculants is a promising strategy to improve the growth and health of crops and develop sustainable agriculture.

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Azospirillum lipoferum strain AZm5 containing 1-aminocyclopropane-1-carboxylic acid deaminase improves early growth of tomato seedlings under nitrogen deficiency

Cited by 42 publications

References 54 publications

Empowering rice seedling growth by endophytic Bradyrhizobium sp. SUTN 9‐2

Empowering rice seedling growth by endophytic Bradyrhizobium sp. SUTN 9‐2

Inoculation of tomato plants with selected PGPR represents a feasible alternative to chemical fertilization under salt stress

Alleviation of Abiotic and Biotic Stresses in Plants by Azospirillum

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