Abstract
Green cuttings of two Populus clones (DN 17 and DN 74) were rooted in peat/vermiculite in growth chambers and nitrogen supplied using a relative addition rate (RA) of either 4% or 8%. Growth chamber conditions were modified to induce active growth followed by dormancy and, finally, another cycle of active growth. During each of these three phases, total biomass and nitrogen, and protein, starch and triglyceride concentrations of leaf, shoot and root tissues were measured.
Treatment differences in response to N occurred in all tissues. Protein concentrations did not mirror total N concentrations and clonal differences in protein concentrations were more obvious than treatment differences. Root protein concentrations increased sharply after dormancy, indicating strong sink strength. Starch values were higher under low N treatments during growth for the shoot and leaves. Roots showed a large increase in starch concentrations during dormancy, treatment differences being significant. Triglyceride levels showed treatment differences in roots, emphasizing their role as a potential storage compound. Overall, during dormancy, protein and triglyceride concentrations are higher in the shoot as compared to total nitrogen and starch, which are more concentrated in the roots.
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Abbreviations
- N:
-
nitrogen
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Wetzel, S., Sennerby-Forsse, L., Burgess, D. (1995). Storage compounds in Populus cuttings in response to two different nitrogen regimes. In: Nilsson, L.O., Hüttl, R.F., Johansson, U.T. (eds) Nutrient Uptake and Cycling in Forest Ecosystems. Developments in Plant and Soil Sciences, vol 62. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0455-5_75
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DOI: https://doi.org/10.1007/978-94-011-0455-5_75
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