Induction of wound-periderm-like tissue in Kalanchoe pinnata (Lam.) Pers. (Crassulaceae) leaves as a defence response to high UV-B radiation levels

Annals of Botany
Luana Beatriz dos Santos NascimentoEliana Schwartz Tavares

Abstract

UV-B radiation can be stressful for plants and cause morphological and biochemical changes. Kalanchoe pinnata is a CAM leaf-succulent species distributed in hot and dry regions, and is rich in flavonoids, which are considered to be protective against UV-B radiation. This study aims to verify if K. pinnata has morphological or anatomical responses as a strategy in response to high UV-B levels. Kalanchoe pinnata plants of the same age were grown under white light (control) or white light plus supplemental UV-B radiation (5 h d(-1)). The plants were treated with the same photoperiod, photosynthetically active radiation, temperature and daily watering system. Fragments of the middle third of the leaf blade and petiole were dehydrated and then embedded in historesin and sectioned in a rotary microtome. Sections were stained with toluidine blue O and mounted in Entellan®. Microchemical analyses by optical microscopy were performed on fresh material with Sudan III, Sudan IV and phloroglucinol, and analysed using fluorescence microscopy. Supplemental UV-B radiation caused leaf curling and the formation of brown areas on the leaves. These brown areas developed into a protective tissue on the adaxial side of the leaf, but only in directl...Continue Reading

References

Jan 25, 2008·Journal of Plant Research·Satoshi FukudaYuichi Takeuchi
Jan 10, 2012·Physiologia Plantarum·Thomas Matthew Robson, Pedro José Aphalo
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Apr 23, 2015·Journal of Photochemistry and Photobiology. B, Biology·Luana Beatriz Dos Santos NascimentoEliana Schwartz Tavares

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Citations

Nov 5, 2016·Journal of Environmental Radioactivity·Jorden van de WalleAnn Cuypers
Jun 7, 2019·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Parammal Faseela, Jos Thomas Puthur
Jul 13, 2018·Frontiers in Plant Science·Nicol Caplin, Neil Willey

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