Abstract
Eucalyptus globulus Labill and hybrids thereof have low lignin content, favoring cellulose extraction, but are often recalcitrant to clonal propagation. This work analyzed biochemical and morphological changes during adventitious rooting of mini-cuttings of E. globulus × maidenni obtained from mini-stumps cultured in drip fertigated sand bed or intermittent flooding tray commercial propagation systems. Morphological (% rooting, root number and length, mean rooting time) and biochemical parameters (peroxidase activity, total phenolic content and flavonoid content) were monitored to characterize the rooting phases. All of the rooting parameters were equivalent in both systems, indicating comparable efficiency of both methods in clonal propagation. Kinetic profiles of biochemical parameters were also similar, although the activity of peroxidases was an order of magnitude higher and the phenolic content about three times lower in cuttings derived from intermittent flooding-grown mini-stumps than in those derived from sand bed-grown mini-stumps. Taken together, results suggest that rooting phases were similar in both systems: induction before day 5, formation from day 5 to 15, and elongation from day 15 to 45. These data may contribute to the development of rooting phase-specific mineral nutrient solutions to maximize clonal propagation and plant survival.
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Acknowledgments
The authors thank Aracruz Celulose S.A. for the supply of plant material and for the grant-in-aid of research to carry out this investigation. The Brazilian government agencies CAPES (Federal Agency for Graduate Education) and CNPq (National Council for Scientific and Technological Development) provided graduate, undergraduate and research scholarships.
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Schwambach, J., Ruedell, C.M., de Almeida, M.R. et al. Adventitious rooting of Eucalyptus globulus × maidennii mini-cuttings derived from mini-stumps grown in sand bed and intermittent flooding trays: a comparative study. New Forests 36, 261–271 (2008). https://doi.org/10.1007/s11056-008-9099-2
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DOI: https://doi.org/10.1007/s11056-008-9099-2