Participation of abscisic acid and gibberellins produced by endophytic <i>Azospirillum</i> in the alleviation of drought effects in maize

Cohen, Ana Carmen; Travaglia, Claudia; Bottini, Rubén; Píccoli, Patricia

doi:10.1139/b09-023

Cited by 310 publications

(115 citation statements)

References 30 publications

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“…Endophytic bacteria Pseudomonas pseudoalcaligenes was shown to induce accumulation of higher concentrations of glycine betain-like compounds leading to improved salinity stress tolerance in rice (Jha et al, 2011). Cohen et al (2009) demonstrated that water stress tolerance in maize plants was alleviated by accumulation of the abscisic acid (ABA) produced by endophytic Azospirillum spp. and the effect was further enhanced by plant growth promoting hormones IAA and gibberellins.…”

Section: Role Of Endophytes In Adaptation Of Agricultural Crops To Bimentioning

confidence: 99%

Bacterial endophytes in agricultural crops and their role in stress tolerance: a review

Miliūtė

Buzaitė

Baniulis

et al. 2015

Zemdirbyste-Agriculture

187

104

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Bacterial endophytes are a class of endosymbiotic microorganisms widespread among plants that colonize intercellular and intracellular spaces of all plant compartments and do not cause plant disease or significant morphological changes. Plant and endophytic bacteria association includes vast diversity of bacterial taxa and plant hosts and in this review we present an overview of taxonomic composition of endophytes identified in common agricultural crops. Further, during the last decade, new aspects of the microbial diversity have emerged with application of new metagenomic analysis methods in studies of bacterial endophytes. Endophytic bacteria community structure is influenced by plant genotype, abiotic and biotic factors such as environment conditions, microbe -microbe interactions and plant -microbe interactions. Agricultural practices, such as soil tillage, irrigation, use of pesticides and fertilizers have a major effect on function and structure of soil and endophytic microbial populations. Therefore, the use of agricultural practices that maintain natural diversity of plant endophytic bacteria is becoming an important element of sustainable agriculture that could ensure plant productivity and quality of agricultural production. The diverse endophytic microbial communities play integral and unique role in the functioning of agroecosystems. Endophytic bacteria have been shown to have several beneficial effects on their host plant, including growth promoting activity, modulation of plant metabolism and phytohormone signalling that leads to adaptation to environmental abiotic or biotic stress. Use of endophytic bacteria presents a special interest for development of agricultural applications that ensure improved crop performance under cold, draught or contaminated soil stress conditions or enhanced disease resistance.

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Section: Role Of Endophytes In Adaptation Of Agricultural Crops To Bimentioning

confidence: 99%

Bacterial endophytes in agricultural crops and their role in stress tolerance: a review

Miliūtė

Buzaitė

Baniulis

et al. 2015

Zemdirbyste-Agriculture

187

104

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“…They could not find ABA. Recently, however, Forchetti et al (2007) detected ABA in isolated strains of endophytic bacteria in roots of Helianthus annuus and Cohen et al (2009) found ABA in Azospirillum brasiliense. When the rhizosphere of Zea mays was enriched with this bacterium, ABA was taken up by the roots and contributed there to an increased ABA.…”

Section: Introductionmentioning

confidence: 99%

The evolution of abscisic acid (ABA) and ABA function in lower plants, fungi and lichen

Hartung¹

2010

Functional Plant Biol.

121

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Abstract. Abscisic acid (ABA) -the universal stress hormone of cormophytes -was detected in very low concentrations in almost all organisms tested from a range of cyanobacteria, algae, bryophytes, fungi and lichens and higher plants (Fig. 1). There are a few reports only on stress-induced ABA biosynthesis in cyanobacteria and algae. This extra ABA is released to the external medium. Application of external ABA has been shown to produce weak and contradicting effects on development and metabolism of algae. In most studies, extremely high concentrations of external ABA have been applied, those being far beyond any physiological concentration range. It is, therefore, extremely difficult to discuss those data satisfactorily. When organisms start to colonise terrestrial habitats (e.g. aquatic liverworts, mosses), endogenous ABA is increased even under mild drought stress, then desiccation protecting mechanisms are stimulated and the formation of terrestrial organs is induced. The same can be observed in water ferns (Marsilea) and in a range of heterophyllous angiosperms. Sporophytes of hornwort and mosses that bear true stomata, have particularly high ABA levels and their stomata respond to ABA as is the case in cormophytes, although a significant regulatory function of these stomata does not exist. Fungi produce large amounts of ABA that are released into the external medium and do not seem to have a function for the fungus. Fungal ABA, however, may be significant in associations of fungi with cyanophytes and algae (lichens), in mycorrhizal associations and in the rhizosphere of higher plants.

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“…These stabilize membrane proteins and lipids structure, preserving enzymes functions while making the water adhere to these molecules structure in dehydrated cells (Cohen et al, 2009;Sharma and Verslues, 2010;Khan et al, 2013;Cohen et al, 2015). Cohen et al (2015) evaluated the response of Arabidopsis thaliana plants associated with A. brasiliense under drought conditions and found that abscisic acid (ABA) produced by the bacterium increased the root system and stomatal closure due to proline synthesis.…”

Section: Resultsmentioning

confidence: 99%

Water use efficiency in soybean crop after inoculation with Azospirillum brasiliense in the Cerrado of Tocantins State, Brazil

Reina¹,

Pelúzio²

2017

Afr. J. Biotechnol.

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Crops in the Cerrado experience short drought stress periods that affect cultivation development, especially the water use efficiency (WUE), which can be modified by the use of Azospirillum brasiliense bacteria. In this sense, this study evaluated soybean plants' response to A. brasiliense inoculation, in relation to WUE, in the Cerrado of Tocantins State. During the growing season of 2015/2016, three experiments were conducted in Palmas municipality, with analyses in the phenological stages: R3 for the first planting and R2 for the second and third plantings. The experimental design used in each experiment was randomized block with ten treatments and four replications. The treatments were disposed in 2x5 factorial scheme, represented by two cultivars (M-9144RR and TMG 1288RR) and five different doses of A. brasiliense (0, 100, 200, 300 and 400 ml of the commercial product per hectare). They were applied through the leaf at V2 and R1 stages of the crops. WUE determination was done through photosynthesis measurement (IRGA), through which the photosynthesis and transpiration values were obtained. There was no WUE difference between the cultivars. A. brasiliense doses had effect in relation to WUE, on stressed crops. A. brasiliense inoculation did not show any significant change in WUE in crops with favorable conditions.

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Participation of abscisic acid and gibberellins produced by endophytic Azospirillum in the alleviation of drought effects in maize

Cited by 310 publications

References 30 publications

Bacterial endophytes in agricultural crops and their role in stress tolerance: a review

Bacterial endophytes in agricultural crops and their role in stress tolerance: a review

The evolution of abscisic acid (ABA) and ABA function in lower plants, fungi and lichen

Water use efficiency in soybean crop after inoculation with Azospirillum brasiliense in the Cerrado of Tocantins State, Brazil

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