RT Journal Article
T1 Potential phenolic bioherbicides from Cladonia verticillaris produce ultrastructural changes in Lactuca sativa seedlings
A1 Tigre, R. C.
A1 Pereira, Eugênia C.
A1 Da Silva, Nicácio H.
A1 Vicente Córdoba, Carlos
A1 Legaz González, María Estrella
AB 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.
PB Elsevier
SN 0254-6299
YR 2015
FD 2015-05
LK https://hdl.handle.net/20.500.14352/23496
UL https://hdl.handle.net/20.500.14352/23496
LA eng
NO Ministerio de Ciencia e Innovación (España)
NO Coordenadoira de Aperfeçioamento de Pessoal de Ensino Superior (CAPES, Brazil)
NO Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil)
DS Docta Complutense
RD 18 abr 2025