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Potential phenolic bioherbicides from Cladonia verticillaris produce ultrastructural changes in Lactuca sativa seedlings

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Tigre, R. C. and Pereira, Eugênia C. and Da Silva, Nicácio H. and Vicente Córdoba, Carlos and Legaz González, María Estrella (2015) Potential phenolic bioherbicides from Cladonia verticillaris produce ultrastructural changes in Lactuca sativa seedlings. South African Journal of Botany, 98 . pp. 16-25. ISSN 0254-6299

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Official URL: https://www.sciencedirect.com/science/article/pii/S025462991500023X



Abstract

The possibilities for using phenolics, extracted from the lichen Cladonia verticillaris with different organic solvents, as bioherbicides have herein been studied through observation of the ultrastructural changes produced in Lactuca sativa seedlings. The different extracts mainly contain protocetraric and fumarprotocetraric acids and very small amounts of atranorin. It has been observed that the roots of lettuce seedlings grow more rapidly in the presence of the phenols than in their absence. This fact is supported by a minor number of lobes and less indentation of the parenchymatous cells as well as a major appearance of active dictyosomes in their cytoplasm. Nevertheless, seedling leaves developed in the presence of these extracts show drastic degenerative changes. Intergranal lamellae of chloroplasts disappear whereas thylakoids are melted in amorphous masses. In some cases, the number of dictyosomes increases in parenchymatous cells and mitochondria disorganize their internal membranes, though in a minor degree of that observed for chloroplasts.


Item Type:Article
Uncontrolled Keywords:Cladonia verticillaris; Lactuca sativa; Depsidones; Leaf Root; Ultrastructure
Subjects:Medical sciences > Biology > Botany
Medical sciences > Biology > Plant physiology
ID Code:46780
Deposited On:09 Mar 2018 09:38
Last Modified:09 Apr 2019 09:39

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