New insights into indole-3-acetic acid metabolism in<i>Azospirillum brasilense</i>

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

doi:10.1111/jam.14080

Cited by 26 publications

(28 citation statements)

References 37 publications

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“…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%

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: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…The phenotypic variant Az39 pFAJ64, obtained by Rivera et al . (2018) according to the methodology proposed by Vanstockem et al . (1987) was also used.…”

Section: Methodsmentioning

confidence: 99%

“…Identification and quantification of IAA was conducted by reverse‐phase HPLC (Rivera et al . 2018). Briefly, an Aligent 1200 Series HPLC system with Quaternary Pump, which features an Aligent Eclipse XDB‐C18 column (4·6 mm diameter, 150·0 mm length and 5·0 μm particle size), was used at a flow rate of 1 ml min −1 .…”

Section: Methodsmentioning

confidence: 99%

Day and blue light modify growth, cell physiology and indole‐3‐acetic acid production ofAzospirillum brasilenseAz39 under planktonic growth conditions

et al. 2020

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Aim In this work, we evaluated the effects of light on growth, cell physiology and stress response of Azospirillum brasilense Az39, a non‐photosynthetic rhizobacteria, under planktonic growth conditions. Methods and results Exponential cultures of Az39 were exposed to blue (BL), red (RL) and daylight (DL) or maintained in darkness for 24, 48 and 72 h. The biomass production and indole 3‐acetic acid (IAA) biosynthesis increased by exposition to DL. Conversely, BL decreased IAA concentration through a direct effect on the molecule. The DL increased superoxide dismutase activity, hydrogen peroxide and thiobarbituric acid reactive substances levels, but the last one was also increased by BL. Both DL and BL increased cell aggregation but only BL increased biofilm formation. Conclusions We demonstrated that both BL and DL are stress effectors for A. brasilense Az39 under planktonic growth conditions. The DL increased biomass production, IAA biosynthesis and bacterial response to stress, whereas BL induced cell aggregation and biofilms formation, but decreased the IAA concentration by photooxidation. Significance and Impact of the Study Blue light and DL changes growth capacity, cell physiology and plant growth promotion ability of A. brasilense Az39 and these changes could be considered to improve the production and functionality of biofertilizers.

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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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New insights into indole-3-acetic acid metabolism inAzospirillum brasilense

Abstract: We propose a renewed model to explain IAA metabolism in A. brasilense, one of the most studied phytostimulatory bacteria.

Cited by 26 publications

References 37 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

Day and blue light modify growth, cell physiology and indole‐3‐acetic acid production ofAzospirillum brasilenseAz39 under planktonic growth conditions

Innovation in Propagation of Fruit, Vegetable and Ornamental Plants

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