Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/15096
Title: Acclimation of manwood seedlings to full sunlight
Other Titles: Aclimatação de mudas de acariquara à alta irradiância
Authors: Magalhães, Nilvanda dos Santos
Marenco, R. A.
Mendes, Keila Rêgo
Keywords: Minquartia Guianensis
Issue Date: 2009
metadata.dc.publisher.journal: Pesquisa Agropecuaria Brasileira
metadata.dc.relation.ispartof: Volume 44, Número 7, Pags. 687-694
Abstract: The aim of this work was to determine the physiological changes that occur in manwood (Minquartia guianensis) during the acclimation process to high irradiance, and also to determine the acclimation strategy of this species. Plants kept in low light were transferred to high irradiance for 290 days. During this period the ratio between variable fluorescence and maximum fluorescence (Fv/Fm) was measured in leaves developed in the shade, and after premature senescence due to photooxidation, in sun-acclimated leaves. At the end of the experimental period the anatomic and photosynthetic characteristics of leaves were determined. Exposure to high irradiance caused, just after transferring, strong photoinhibition and partial photooxidation, but did not cause plant death. Leaves produced in sunny environment showed Fv/Fm similar to that of control plants. Light-saturated photosynthesis and CO2 saturated-photosynthesis were 90 and 50% higher in plants acclimated to high irradiance. The maximum carboxylation velocity of rubisco and the maximum rate of ribulose bisphosphate regeneration followed the same trend. Leaves produced under sunlight had higher stomatal density and increased leaf thickness. The production of new leaves is the main acclimation strategy to high irradiance in manwood.
URI: https://repositorio.inpa.gov.br/handle/1/15096
metadata.dc.identifier.doi: 10.1590/S0100-204X2009000700006
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