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Ricci, Ada; Carra, Angela; Rolli, Enrico; Bertoletti, Cristina; Branca, C.

doi:10.1023/a:1025045213739

Cited by 14 publications

(7 citation statements)

References 16 publications

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“…Urea derivatives have been described as rooting adjuvants as they enhance adventitious root formation in mung bean shoots and apple microshoots (Ricci et al 2006). Root formation on stem slices of apple was enhanced when roots were induced in the presence of 2,3-MDPU and 3,4-MDPU in combination with suboptimal IBA concentrations (Ricci et al 2003). The effect of MDPUs on AR in oak and chestnut was thus tested in combination with different auxin concentrations.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, N,N´-bis-(2,3-methylenedioxyphenyl)urea (2,3-MDPU) and have been used to induce AR or as adjuvants (Ricci and Bertoletti 2009). Despite their chemical similarity to urea derivatives displaying cytokinin-like activity, these compounds do not show any cytokinin-like or auxin-like activity, although the rooting response was improved in several species, such as apple, pine and caper (Ricci et al 2001(Ricci et al , 2003(Ricci et al , 2008Carra et al 2012). Both compounds enhanced AR in apple microshoots and Capparis spinosa nodal explants (Ricci et al 2001;Carra et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Both compounds enhanced AR in apple microshoots and Capparis spinosa nodal explants (Ricci et al 2001;Carra et al 2012). Use of these compounds in combination with exogenous auxin improved AR in apple stem slices and in Pinus radiata rooting-competent tissues, even at exogenous auxin concentrations that were sub-optimal for P. radiata (Ricci et al 2003(Ricci et al , 2008. Although the mode of action of these compounds remains unknown, it has been suggested that they may interact with auxin (endogenous or exogenous) thus improving the rooting response (Ricci and Bertoletti 2009).…”

Section: Introductionmentioning

confidence: 99%

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Effects of auxin and urea derivatives on adventitious rooting in chestnut and oak microshoots

Vielba

Vidal

Ricci

et al. 2020

Israel J. Plant Sci.

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The present study investigated how auxin concentration and the method of application affected the formation of adventitious roots in microshoots of chestnut (Castanea sativa) and oak (Quercus robur). The activity of two urea derivatives (2, 3-MDPU and 3, 4-MDPU) was also evaluated. Microshoots were derived from basal sprouts of two mature chestnut trees (P1 and P2) and one adult oak genotype (Sainza). In chestnut, rooting percentage was positively affected by auxin in a dose-dependent manner, particularly in shoots treated with the hormone for 24 h. The effect of auxin on rooting also differed depending on the application method. In shoots treated for 24 h, the highest concentration of auxin produced the healthiest rooted plantlets, in terms of the root system and shoot quality. By contrast, in shoots treated by the basal quick-dip method, the shoot quality was best at the lowest auxin concentration. The effect of urea derivatives on the root system depended on the species as well as on the auxin concentration and application period. Use of the MDPUs improved the root system architecture of auxin-treated shoots by promoting lateral root development and triggering the synchronous initiation of root primordia at the base of the shoot. Shoot quality was also improved by MDPUs, which promoted resumption of growth and reduced shoot-tip necrosis.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of auxin and urea derivatives on adventitious rooting in chestnut and oak microshoots

Vielba

Vidal

Ricci

et al. 2020

Israel J. Plant Sci.

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“…Starting from our structure-activity relationship studies, we reported that two symmetrically substituted urea derivatives, the N,N′-bis-(2,3-methylenedioxyphenyl)urea (2, and the N,N′-bis- (3,4-methylenedioxyphenyl) urea (3,, exert adventitious rooting adjuvant activity without showing auxin-like activity (Ricci et al 2001a(Ricci et al , 2003(Ricci et al , 2008 and induce somatic embryogenesis in stigma and styles of Citrus without showing cytokinin-like activity (Carra et al 2006). Then, modifying the aromatic moiety of these synthetic lead substances by the replacement of the methylenedioxyphenyl groups by the isostere benzoxazole ones, we synthesized the 1, 3-di(benzo[d]oxazol-5-yl) urea (5-BDPU) and the 1, 3-di(benzo[d]oxazol-6-yl)urea (6-BDPU) (Fig.…”

Section: Introductionmentioning

confidence: 99%

The adjuvant activity of two urea derivatives on cytokinins: an example of serendipitous dual effect

et al. 2021

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The aim of this study was to investigate the action spectrum of two urea derivatives, the 1,3-di(benzo[d]oxazol-5-yl)urea (5-BDPU) and the 1,3-di(benzo[d]oxazol-6-yl)urea (6-BDPU). In order to evaluate a possible adjuvant activity on cytokinins the compounds alone or in the simultaneous presence of different cytokinins were assayed either on in vitro typical cytokinin-related bioassays, or on in planta interaction with cytokinin signal transduction pathway. The compounds ability to activate the cytokinin receptor CRE1/AHK4 was studied either by a heterologous bacterial assay or by a competitive binding assay and docking simulations were performed with the crystal structure of the same receptor. Then, owing to their chemical structure which resembles that of urea-type cytokinins, the ability of 5- and 6-BDPU to inhibit the activity of cytokinin oxidase/dehydrogenase of Zea mays (ZmCKX1) was investigated and docking simulations were performed as well. Accordingly to the experimental results, we speculate that BDPUs could show a dual activity: the blocking of the conformational re-adaption of CRE1/AHK4 receptor maintaining the cytokinin inside its binding pocket, thus possibly enhancing its kinase action; the inhibition of cytokinin oxidase/dehydrogenase activity thus possibly preventing its cleavage of natural cytokinins with isoprenoid side chain. Graphic abstract

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“…4 While 3,4-MDPU (N,N'-bis(3,4methylendioxyphenyl)urea is considered as an adjuvant for adventitious root growth in the presence of auxin. 5 The incorporation of ureas in synthesis products has increased in recent years and different methodologies for their preparation have been developed. [6][7][8][9][10][11] Figure 1 Representative examples of symmetrical ureas…”

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confidence: 99%

New Route to Direct Synthesis of Symmetrical Ureas from Carboxylic Acids

Pujol,

Jahani,

Yassine

et al. 2023

Synthesis

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The first method for the direct conversion of carboxylic acids into ureas has been developed. The classical procedures described above for the formation of ureas from carboxylic acids require two steps, preparation of the isocyanate followed by its aminolysis. In this work, arylcarboxylic and arylalkylcarboxylic acids have been transformed into symmetric ureas in a single step using DPPA or sodium azide as nitrogen source. The addition of water (method A) or the presence of solvent water (method B) was essential for the formation of symmetrical ureas from the corresponding carboxylic acids. The corresponding ureas have been obtained in good to excellent yields of 46 to 100%. This procedure was compatible with differ-ent substituents present in the starting carboxylic acid.

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Cited by 14 publications

References 16 publications

Effects of auxin and urea derivatives on adventitious rooting in chestnut and oak microshoots

Effects of auxin and urea derivatives on adventitious rooting in chestnut and oak microshoots

The adjuvant activity of two urea derivatives on cytokinins: an example of serendipitous dual effect

New Route to Direct Synthesis of Symmetrical Ureas from Carboxylic Acids

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