Abstract
Rooting is an important step of in vitro propagation that involves auxin signaling and the growth-promoting properties of phenolic compounds. We evaluated the effects of indole-3-butyric acid (IBA) and phloroglucinol (PG) on the in vitro rooting of shoots, histomorphology and proteomic profile during the root development in Cariniana legalis. Micropropagated shoots were incubated in 1/4 Murashige and Skoog culture medium supplemented with IBA (0, 50 and 100 μM) and PG (0 and 30 μM). The root development, histomorphology and proteomic profile were analyzed. IBA was necessary for root induction and the combination of IBA (50 or 100 μM) with 30 μM PG significantly increased the number of roots. The histomorphology of shoots treated with 50 μM IBA + 30 μM PG showed that rooting started at 12 days of induction, with the presence of meristematic-type cells from the callus induced on the base of shoots. The 50 μM IBA + 30 μM PG (IBA + PG) treatment affected the abundance of proteins during the rooting of shoots. The up-accumulation of proteins related to carbohydrate and amino acid metabolic processes in 12-day IBA + PG-treated shoots compared with 0-day shoots (before root induction) was associated with the rooting promoted by IBA + PG. The down-accumulation of proteins involved in secondary metabolic processes in 12-day IBA + PG-treated shoots compared with 12-day with no plant growth regulators (PGR) shoots was related to the lack of rooting in with no PGR shoots, while the increased accumulation of antioxidant proteins was related to rooting in 12-day IBA + PG-treated shoots compared with no PGR shoots. This is the first work to demonstrate the effect of IBA + PG on the proteomic profile and histomorphology during the rooting of an economically and ecologically important endangered species, which is difficult to root in vitro.
Key message
Indole-3-butyric acid improved the in vitro rooting changing the proteomic profile and histomorphology in micropropagated shoot of Cariniana legalis, an endangered species from Atlantic Forest, which is difficult-to-root.
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Abbreviations
- DTT:
-
Dithiothreitol
- eIF5A:
-
Eukaryotic translation initiation factor
- HSP:
-
Heat shock proteins
- IBA:
-
Indole-3-butyric acid
- IAA:
-
Indole-3-acetic acid
- LED:
-
Light-emitting diode
- MS:
-
Murashige and Skoog (plant culture medium)
- PG:
-
Phloroglucinol
- TCA:
-
Trichloroacetic acid
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Acknowledgements
Funding for this work was provided by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (444,453/2014-8 and 307596/2016-8) and the Fundação Carlos Chagas Filho de Amparo à Pesquisa no Estado do Rio de Janeiro (FAPERJ) (E26/201.247/2015; E26/202.969/2016; E26/202.533/2019). This study was also financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazil (CAPES)—Finance Code 001. TRO acknowledges the scholarship funded by FAPERJ. JL and YRSR are thankful for the scholarship provided by CAPES—Finance Code 001.
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CSC and JL conceived the study, designed the experiments and wrote the manuscript. JL was responsible for the in vitro cultures. JL, YRSR and CSC were responsible for the histological experiments and analyses. JL, TRO and VS were responsible for the proteomic analyses. All authors have read and approved the final manuscript.
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Lerin, J., Ribeiro, Y.R.d.S., de Oliveira, T.d.R. et al. Histomorphology and proteomics during rooting of in vitro shoots in Cariniana legalis (Lecythidaceae), a difficult-to-root endangered species from the Brazilian Atlantic Forest. Plant Cell Tiss Organ Cult 144, 325–344 (2021). https://doi.org/10.1007/s11240-020-01955-7
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DOI: https://doi.org/10.1007/s11240-020-01955-7