Proteomic profile and polyamine contents are modulated by light source to promote in vitro shoot development in Cariniana legalis (Martius) O. Kuntze (Lecythidaceae)
The effect of different light sources on in vitro shoot development in Cariniana legalis, an endangered species from the Atlantic Forest, was evaluated. Cotyledonary and apical nodal explants were subjected to light-emitting diode (LED) lamps with different spectral combinations and fluorescent lamps (control). Shoot growth, endogenous contents of free polyamines (PAs) and proteomic profiles were analyzed at 60 days of development. Treatments consisting of white, low-blue and deep-red, with (W/lB/dR/fR) and without (W/lB/dR) far-red spectra, resulted in greater elongation of shoots from cotyledonary nodal explants, and the low-blue and deep-red spectral combination appeared to be a positive factor stimulating shade-avoidance responses. Shoots grown under the W/lB/dR LED exhibited greater elongation and higher contents of free putrescine, spermidine and total free PAs compared to those grown under the fluorescent lamp. Comparative proteomic analysis revealed 15 up- and 41 down-regulated proteins in shoots grown under the W/lB/dR LED lamp when compared to the control. The differentially up-regulated proteins in shoots grown under the LED lamp are related to cell organization and composition, as well as biological regulation processes, whereas proteins related to stress processes were down-regulated. The LED lamp consisting of white, low-blue and deep-red spectra increased shoot elongation in C. legalis, in association with differential accumulation of proteins and PAs, suggesting the relevance of source light on in vitro shoot development in this species.
A light source combining low-blue and deep-red spectra enhanced shoot elongation, differential protein accumulation and polyamine contents during in vitro shoot development in C. legalis.
KeywordsComparative proteomics In vitro organogenesis LED lamps Photomorphogenesis
Plant growth regulators
Woody plant medium
Funding for this work was provided by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (444,453/2014-8 and 307,596/2016-8) and the Fundação Carlos Chagas Filho de Amparo à Pesquisa no Estado do Rio de Janeiro (FAPERJ) (E26/010.001507/2014; E26/202.969/2016). This study was also financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazil (CAPES)—Finance Code 001. VPMA and RSR acknowledge the scholarship funded by FAPERJ. JL is thankful for the scholarship provided by CAPES.
CSC and JL conceived the study, designed the experiments and wrote the manuscript. JL was responsible for the in vitro cultures. JL, VPMA and CSC were responsible for the PA experiments and analyses. JL, RSR and VS were responsible for the proteomic analyses. All authors read and approved the final manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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