Regulation of IAA Biosynthesis in Azospirillum brasilense Under Environmental Stress Conditions

Molina, R.; Rivera, Diego; Mora, Verónica; López, Gastón; Rosas, Susana B.; Spaepen, Stijn; Vanderleyden, Jos; Cassán, Fabricio

doi:10.1007/s00284-018-1537-6

Cited by 50 publications

(46 citation statements)

References 31 publications

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“…Indolacetic acid (IAA) is one of the most important molecules produced by Azospirillum sp. and studies suggest bacterial biosynthesis of IAA can be drastically affected by environmental conditions and exposure to other compounds [16,18]. Thus, the application of IBA may have influenced the production of the rhizobacteria growth-promoting substances.…”

Section: Sources Of Variation Rc (%) Sv (%) Fr (%) S (%) CC (%) Dm (Gmentioning

confidence: 99%

“…Studies have shown promising results for association with the PGPR species Azospirillum brasilense; it promotes root development by increasing the production of hormones, leading to growth and development of plants [16][17][18]. In this context, the objective of this study was to assess the viability of producing blueberry nursery plants from cuttings using different doses of IBA in association with A. brasilense.…”

Section: Introductionmentioning

confidence: 99%

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Association of Indolebutyric Acid with Azospirillum brasilense in the Rooting of Herbaceous Blueberry Cuttings

et al. 2019

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Association between auxins and plant growth-promoting bacteria can stimulate root growth and development of fruit crop nursery plants, and can be a promising biological alternative to increase the rooting of cuttings. The objective of this study was to assess the viability of producing ‘Powderblue’ blueberry nursery plants from cuttings using different doses of indolebutyric acid (IBA) in association with Azospirillum brasilense. The following treatments were tested: 0 (control); 500 mg L−1 of IBA; 1000 mg L−1 of IBA; A. brasilense; 500 mg L−1 of IBA + A. brasilense; and 1000 mg L−1 of IBA + A. brasilense. The experimental design was completely randomized, with six treatments and four replicates, and each plot (box) consisted of 10 cuttings. The boxes were arranged in a mist chamber with an intermittent regimen controlled by a timer and solenoid valve. After 90 days, the following variables were assessed: rooted cuttings; survival of cuttings; foliar retention; sprouting; cuttings with callus; root dry mass per cutting; number of roots per cutting; and root length. It was observed that the application of IBA with the A. brasilense rhizobacteria increased the number of roots of ‘Powderblue’ blueberry cuttings, while the treatments with IBA alone and IBA 1000 mg L−1 + A. brasilense increased the root length of cuttings. However, treatments with IBA and A. brasilense had no impact on % rooted cuttings and % survival of cuttings.

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Section: Sources Of Variation Rc (%) Sv (%) Fr (%) S (%) CC (%) Dm (Gmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Association of Indolebutyric Acid with Azospirillum brasilense in the Rooting of Herbaceous Blueberry Cuttings

et al. 2019

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“…Our results proved that the metabolites of bacterial-feeding nematodes could stimulate the metabolism (synthesis of IAA) of IAA producing bacteria. Moreover, for IAA-producing bacteria, the synthesis of IAA are affected by numerous factors, like environmental and genetic conditions (Spaepen et al 2007;Patten et al 2013;Molina et al 2018). In this study, we controlled the conditions except for the treatments, so we speculated that the IAA-producing bacteria recognize the active ingredients of metabolites, and elicit a series of gene expression that enhance the synthesis of IAA.…”

Section: Resultsmentioning

confidence: 99%

Metabolites of Bacterial-Feeding Nematodes Stimulate Bacterial Indole-3-Acetic Acid (IAA) Synthesis

Li¹,

Li²,

Zhou³

et al. 2020

Preprint

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Interorganismal metabolites play significant roles in regulating behaviors and communications between organisms. Nematodes are the most abundant animals on earth, and function well in soil ecosystem due to their interactions with microbes. Bacterial-feeding nematodes stimulate the activity of indole-3-acetic acid (IAA)-producing bacteria and increase the content of IAA in soil. However, we do not fully understand how bacterial-feeding nematodes interact with bacteria and affect IAA synthesis. In this study, the model nematode Caenorhabditis elegans and three species of soil-dwelling IAA-producing bacteria ( Bacillus amyloliquefaciens JX1, Arthrobacter pascens ZZ21 and A. chlorphenolicus L4) were employed to determine the effect of nematodes on the IAA biosynthesis of bacteria. Then the metabolites and extracts of C. elegans were tested the effect on three bacterial IAA synthesis (but only A. pascens ZZ21 for the extracts). Lastly, two soil-dwelling bacterial-feeding nematodes ( Mesorhabditis sp. and Acrobeloides sp.) and two IAA-producing bacteria ( B. amyloliquefaciens JX1 and A. pascens ZZ21) were subsequently used to explore the universality of this interaction. Our results showed that the metabolites or extracts of nematodes could promote the IAA biosynthesis of IAA-producing bacteria, and implied this stimulatory effect maybe widely spread in metabolites of bacterial-feeding nematodes and IAA-producing bacteria, but vary with nematodes and bacteria species. Our findings indicate that bacterial-feeding nematodes could mediate the interaction between nematodes and bacteria by their metabolites, except for their feeding behavior, and offer insights into the ecological function of the metabolites of nematodes.

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“…Studies have shown promising results for association with the PGPR species Azospirillum brasilense, since it promotes root development by increasing the production of hormones, leading to growth and development of plants [14][15][16]. In this context, the objective of this study was to assess the viability of producing blueberry nursery plants from cuttings using different doses of IBA in association with A. brasilense.…”

Section: Fruit Cropsmentioning

confidence: 99%

Innovation in Propagation of Fruit, Vegetable and Ornamental Plants

Roberto

Colombo

2020

Horticulturae

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There are two primary forms of plant propagation: sexual and asexual. In nature, propagation of plants most often involves sexual reproduction, and this form is still used in several species. Over the years, horticulturists have developed asexual propagation methods that use vegetative plant parts. Innovation in plant propagation has supported breeding programs and allowed the production of high-quality nursery plants with the same genetic characteristics of the mother plant, and free of diseases or pests. The purpose of this Special Issue, “Innovation in Propagation of Fruit, Vegetable and Ornamental Plants”, was to present state-of-the-art techniques recently developed by researchers worldwide. The Special Issue has brought together some of the latest research results of new techniques in plant propagation in nine original papers, which deal with a wide range of research activities.

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Regulation of IAA Biosynthesis in Azospirillum brasilense Under Environmental Stress Conditions

Cited by 50 publications

References 31 publications

Association of Indolebutyric Acid with Azospirillum brasilense in the Rooting of Herbaceous Blueberry Cuttings

Association of Indolebutyric Acid with Azospirillum brasilense in the Rooting of Herbaceous Blueberry Cuttings

Metabolites of Bacterial-Feeding Nematodes Stimulate Bacterial Indole-3-Acetic Acid (IAA) Synthesis

Innovation in Propagation of Fruit, Vegetable and Ornamental Plants

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