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Document type: Trabalho de Conclusão de Curso
Title: Empirical evidence of color changing in galls: under the light of light
Author: Bomfim, Phabliny Martins Silva
First Advisor: Oliveira, Denis Coelho de
First coorientator: Cardoso, João Custódio Fernandes
Summary: Several studies have hypothesized about coloration in galls, including change in gall metabolism, galling–natural enemies interactions, gall maturation stage, influence of galling exogenous cytokinins and aposematism. However, none of these were confirmed so far. On the other hand, the vibrant colors of some galls may be explained simply by the effect of light exposure. This may lead to anthocyanin (Anth) accumulation, functioning as a mechanism of defense against the effects of sun light. Nevertheless, no studies provided systematic quantification/observation of this phenomenon. Herein, we ask whether gall tissues accumulate Anth like a mechanism of defense against the effects of sun light and which consequences may occur in photosynthetic rate. We demonstrate that adaxial galls induced by Cecidomyiidae (Diptera) in Qualea parviflora (Vochysiaceae) are exposed to higher light incidence, presenting more Anth accumulation and therefore red coloration. On the other hand, the abaxial galls receive less light compared with adaxial ones, with less Anth and green coloration. In addition, in galls from angled leaves, the greater the angulation of the leaf, the higher the non-equality between Anth on sun and shade sides of galls. This explains the intermediate color pattern found in galls from high angulated leaves, presenting green and red, respectively in shade and sun sides. We did not find any differences according to the concentration of photosynthetic pigments. However, concerning photosynthesis parameters, (Fm’-F’)/Fm’ and Fv/Fm were higher in bellow galls, indicating a better photosynthetic performance compared with above galls. In the other hand, due to high light exposure, the NPQ and Rfd were higher in above galls, indicating that the Anth functions as a photoprotective pigment, maintaining the high tissue vitality in galls exposed to the stress condition. We demonstrate empirical evidence that the variation of light regimes may create differential Anth accumulation and influence coloration in galls.
Keywords: Gall
Language: eng
Country: Brasil
Publisher: Universidade Federal de Uberlândia
Quote: BOMFIM, Phabliny Martins Silva. Empirical evidence of color changing in galls: under the light of light. 2017. 25 f. Trabalho de Conclusão de Curso (Graduação em Ciências Biológicas) – Universidade Federal de Uberlândia, Uberlândia, 2017.
Date of defense: 15-Dec-2017
Appears in Collections:TCC - Ciências Biológicas (Uberlândia)

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