Carbon Translocation as Affected by Shade in Saplings of Shade Tolerant and Intolerant Species |
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Authors: | RP Souza IFM Válio |
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Institution: | 1. Departamento de Fisiologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, Caixa Postal 6109, CEP 13083-970, ?o Paulo, Brazil
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Abstract: | Carbon translocation was affected by shade in different tropical tree species differing in successional status and degree
of shade tolerance. Plants of the early-successional shade-intolerant species Cecropia pachystachya and Schizolobium parahyba and of the late-successional shade-tolerant species Myroxylon peruiferum and Hymenaea courbaril were grown under full sun (FS) and natural shade treatments (NS) and assessed for 14C]-sucrose translocation. Most of the 14C was retained in the fed leaf after a 24 h translocation period. Under FS, the growing apical part of the plant was the most
intense sink for most species. Shade affected growth and sink intensity differently in early and late successional species.
Growth was more markedly affected in the early species. Whereas these continued to invest carbon into the growing apical part
of the plant under shade conditions, the late successional species invested relatively more into other sinks.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | allocation pattern 14C-sucrose Cecropia pachystachya growth Hymenaea courbaril Myroxylon peruiferum Schizolobium parahyba tropical tree species |
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