FENOTYPIC PLASTICITY IN LEAVES OF Eucalyptus dunnii Maiden AND Eucalyptus benthamii Maiden & Cambage UNDER DIFFERENT SHADING LEVELS
DOI:
https://doi.org/10.24278/2178-5031.202032203Keywords:
Luminosity, Acclimation, Leaf AnatomyAbstract
Eucalyptus dunnii Maiden and Eucalyptus benthamii Maiden & Cambage are species of timber interest cultivated in southern Brazil, adapted to the cold climate. Initial growth of young plants is infuenced by the luminosity promoting modifcations in leaf morphoanatomy and physiology. The objective of this work was to evaluate the morphophysiological changes from young plants leaves of E. dunnii and E. benthamii grown under different luminous intensities in nursery, in the Southern Mesoregion of Santa Catarina, Brazil. Leaves of young plants cultivated for six months developed in different light intensities (0%, 50% and 80% of shading) were evaluated in paradermic and transverse sections under light microscopy. Anatomical characters with greater variation in the different levels of shading in E. dunnii were in the epidermis (cuticle, stomata, ordinary epidermal cells), whereas in E. benthamii they were in the epidermis and mesophyll. The phenotypic plasticity in leaves of E. dunnii and E. benthamii indicated the characteristics related to the coating system (cuticle and stomata) as the most expressive in relation to the characteristics of the fundamental system (palisade and spongy parenchyma). The leaves of E. dunnii and E. benthamii present different adaptive strategies regarding the plasticity of morphophysiological characters.
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