Is zinniol a true phytotoxin?: Evaluation of its activity at the cellular level against Tagetes erecta

Zinniol, a non-host selective phytotoxin commonly produced by fungi of the Alternaria genus, has been reported as the metabolite responsible for the phytotoxicity of the lipophilic fraction of A. tagetica. While both the lipophilic fraction and zinniol have been shown to produce necrosis on leaves o...

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Bibliographic Details
Published in:Journal of general plant pathology : JGPP 2010-04, Vol.76 (2), p.94-101
Main Authors: Qui, J.A., Unidad de Bioquimica y Biologia Molecular de Plantas, Yucatan (Mexico). Centro de Investigacion Cientifica de Ycatan, Castro-Concha, L.A, Garcia-Sosa, K, Miranda-Ham, M.L, Pena-Rodriguez, L.M
Format: Article
Language:English
Subjects:
ADN
Agriculture
ALTERNARIA
Biomedical and Life Sciences
Cell culture
CELL STRUCTURE
DNA
ESTRUCTURA CELULAR
EVALUACION
EVALUATION
FITOTOXINAS
FONCTION PHYSIOLOGIQUE
FUNCION FISIOLOGICA
Fungal Diseases
Fungi
Horticulture
http://www.fao.org/aos/agrovoc#c_1414
http://www.fao.org/aos/agrovoc#c_14774
http://www.fao.org/aos/agrovoc#c_2347
http://www.fao.org/aos/agrovoc#c_2736
http://www.fao.org/aos/agrovoc#c_315
http://www.fao.org/aos/agrovoc#c_34323
http://www.fao.org/aos/agrovoc#c_5837
Life Sciences
Microbiology
PHYSIOLOGICAL FUNCTIONS
PHYTOTOXINE
PHYTOTOXINS
Plant Pathology
STRUCTURE CELLULAIRE
TAGETES
Tagetes erecta
Toxicology
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Description
Summary:Zinniol, a non-host selective phytotoxin commonly produced by fungi of the Alternaria genus, has been reported as the metabolite responsible for the phytotoxicity of the lipophilic fraction of A. tagetica. While both the lipophilic fraction and zinniol have been shown to produce necrosis on leaves of susceptible marigold (Tagetes erecta) plants, the true role of zinniol in the infectious process remains uncertain. Using marigold cell cultures as a model, we evaluated the effects of zinniol and the lipophilic fraction at the cellular level and showed that pure zinniol is not markedly phytotoxic at concentrations known to induce necrosis in leaves of T. erecta. Moreover, the effects of zinniol on cell membranes and DNA fragmentation are less intense than those caused by the lipophilic fraction. These results suggest that zinniol may not play a significant role in the A. tagetica-T. erecta interaction and, consequently, its classification as a non-host selective phytotoxin is questionable.
ISSN:1345-2630
1610-739X
DOI:10.1007/s10327-010-0222-9