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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Changes in colour during leaf development of Eugenia uniflora (Myrtaceae): different strategies for integrity conservation of the photosynthetic apparatus

Gabriel Felisberto dos Santos A , Vinícius Coelho Kuster https://orcid.org/0000-0002-1236-486X B , Ana Flávia de Melo Silva A , Ana Paula Faria A and Ana Silvia Franco Pinheiro Moreira https://orcid.org/0000-0001-5090-5527 A C
+ Author Affiliations
- Author Affiliations

A Laboratório de Fisiologia Vegetal, Universidade Federal de Uberlândia, Avenida Pará 1720, CEP 38400-902, Campus Umuarama, Minas Gerais, Brazil.

B Universidade Federal de Jataí, Campus Cidade Universitária, BR 364, quilômetro 195, 3800, 75801-615, Jataí, Goiás, Brazil.

C Correspondence author. Email: anasilviamoreira@ufu.br

Australian Journal of Botany 69(4) 247-257 https://doi.org/10.1071/BT20145
Submitted: 11 November 2020  Accepted: 28 April 2021   Published: 15 June 2021

Abstract

Leaf development is affected by different amounts of light, leading to structural and physiological gradients. Young leaves are normally more sensitive to high light levels, which may trigger different strategies for light protection. On this basis, the objective of the current study was to determine strategies used by young (1st node, red), in transition (2nd node, starting to become green, and 4th node, almost all green) and mature (6th node, green) leaves of Eugenia uniflora L. (Myrtaceae) to deal with light. Young leaves showed less structural protection from light, which improved after the 2nd node. The reddish colour of young E. uniflora leaves is mainly due the greater production of photoprotective pigments, mainly anthocyanins, although the chlorophyll/carotenoid ratio showed some contribution by the carotenoids. Reactive oxygen species were homogeneously distributed in the young leaves, turning to malondialdehyde only in older leaves. The lower structural protection from light and physiological immaturity of young E. uniflora leaves lead to photoinhibition and reduced quantum yield during at times of highest light intensity of the day, causing lower efficiency in electron transport. The E. uniflora case clarifies the occurrence of different defence strategies against light exposure according to leaf developmental stages.

Keywords: ecophysiology, leaf morphology, plant cell development, plant stress, light levels, malondialdehyde, reactive oxygen species, ROS, photoprotective pigments, anthocyanins, palisade parenchyma, vascular bundles.


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