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Proteomic profiles during adventitious rooting of Eucalyptus species relevant to the cellulose industry

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Abstract

Adventitious rooting (AR) is an obligatory step for vegetative propagation of commercial woody species. Paper industries have interest in Eucalyptus globulus Labill and its hybrids due to low lignin and lipid contents, which facilitate cellulose extraction. However, this species and some of its hybrids are recalcitrant to rooting, often requiring exogenous auxin supply. Here we performed a comparative analysis of proteome changes during AR of E. globulus and the easy-to-root species Eucalyptus grandis W. Hill and the effects of exogenous auxin in different phases of the process (induction and formation), using a label-free quantification method. We identified 398 differentially abundant proteins, which were predicted to be involved in different biological pathways, mainly oxidative stress, energy metabolism and photosynthesis. Notable differences between species included proteins involved in oxidative stress, carbon and secondary metabolism. Exogenous auxin appeared to affect the availability of carbon sources and other phytohormones, besides cell cycle and microtubule—related proteins. Important players were also identified in each phase of AR. This is the first in depth analysis of protein changes during AR in Eucalyptus. The findings can be used in future studies to evaluate rooting competence in different genotypes and provide leads for AR improvement.

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Acknowledgements

Seeds used for production of E. globulus and E. grandis microcuttings were a kind gift from Celulose Riograndense S/A (Guaíba, RS, Brazil). This work was funded by Brazilian agencies National Council for Scientific and Technological Development (CNPq-grants 402618/2016-5 and 303560/2017-7) and National Commission for Improvement of Higher Education Personnel (CAPES)-Finance Code 001.

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Contributions

Conceived and designed the experiments: AGFN. Performed the experiments: MRA, JS, VS. Analyzed the data: MRA, JS. Contributed reagents/materials/analysis tools: JPF, AGFN, VS, JS, ASH. Drafted the paper: MRA. Supervised the study and finalized the manuscript: AGFN. All authors contributed to the preparation, revised and agreed with the final version of the manuscript.

Corresponding author

Correspondence to Arthur G. Fett-Neto.

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Electronic supplementary material

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Online Resource 1.

Unchanged proteins during the induction phase. (XLSX 143 kb)

Online Resource 2.

Unchanged proteins during the formation phase. (XLSX 136 kb)

Online Resource 3.

Regulated proteins during the induction phase. (XLSX 99 kb)

Online Resource 4.

Regulated proteins during the formation phase. (XLSX 110 kb)

Online Resource 5.

Identification and classification of regulated proteins during the induction phase. Respective Fold change values and ANOVA results can be accessed in Online Resource 3. (XLSX 27 kb)

Online Resource 6.

Identification and classification of regulated proteins during the formation phase. Respective Fold change values and ANOVA results can be accessed in Online Resource 4. (XLSX 29 kb)

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de Almeida, M.R., Schwambach, J., Silveira, V. et al. Proteomic profiles during adventitious rooting of Eucalyptus species relevant to the cellulose industry. New Forests 51, 213–241 (2020). https://doi.org/10.1007/s11056-019-09728-7

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  • DOI: https://doi.org/10.1007/s11056-019-09728-7

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