Abstract
During seed germination until photoautotrophic establishment, the mobilization of seed-stored reserves represents the main source of carbon structures and energy that all plants need. We report organic and mineral changes coupled with germination and post-germination functional traits of different rubber tree genotypes (wild and PB 260, a clonal variant selected for high latex productivity). By analyzing seeds for their protein, lipid, and carbohydrate contents and the mobilization of these compounds during germination and initial seedling growth, differential mobilization of primary stocks, differences in the enzymatic activities, and changes in mineral nutrient contents were observed between the two genotypes. Furthermore, differential protein profiles were found. Proteins with apparent molecular weights ranging from 7 to 30 kDa and 7 to 40 kDa were observed for wild and clone PB 260 seeds, respectively. Higher mobilization of nitrogen-related compounds indicates that nitrogen metabolism seems to play an essential role in the germination and post-germination processes of H. brasiliensis. The results revealed differences in the primary metabolism between the genotypes studied: our findings provide an integrated understanding of the germination and early post-germination events that could assist rubber tree breeding programs via the creation of histophysiological and biochemical markers.
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Acknowledgements
The authors thank the Ministry of Science, Technology and Innovations/National Institute for Amazonian Research (MCTI/INPA), as well as the members of the Laboratory of Physiology and Plant Biochemistry of INPA (LFBV) for the availability of equipment and infrastructure for analysis, in especially MSc. Rafaela Oliveira da Silva and Dra. Joelma Keith Rodrigues for helping with enzymatic and histochemical analysis, respectively. We too want to thank the Coordination for the Improvement of Higher-Level Personnel (CAPES—Pro-Amazonia: Biodiversity and Sustainability—Nº52/2012)—Brazil, National Council for Scientific and Technological Development (CNPq, Brazil) and Amazonas State Research Support Foundation (FAPEAM) for finantial supporting this study. José F. de C. Gonçalves, Eduardo E. de L. e Borges, Marcio V. Ramos, Adriano N. Nesi and Wagner L. Araújo acknowledge research productivity grant – PQ provided by CNPq.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior,Finance Code 001 José Francisco de Carvalho Gonçalves,Conselho Nacional de Desenvolvimento Científico e Tecnológico 308373/2019-7,José Francisco de Carvalho Gonçalves.
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JCC and JFC—planned and designed the research. JCC—performed the experiments. JCC—analyzed the data. JCC, AVF, DPS, WLA, MVR, ANN, BR and JFC wrote the text. All authors read, commented on and approved the final version of the manuscript.
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de Carvalho, J.C., de Carvalho Gonçalves, J.F., Fernandes, A.V. et al. Reserve mobilization and the role of primary metabolites during the germination and initial seedling growth of rubber tree genotypes. Acta Physiol Plant 44, 80 (2022). https://doi.org/10.1007/s11738-022-03415-5
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DOI: https://doi.org/10.1007/s11738-022-03415-5