Abstract
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.
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Acknowledgments
This work has been supported by the National Council of Science and Technology (CONACYT, Mexico) through grant No. 54868 and a doctoral scholarship (183263) to J.Q.-Z. We wish to thank PanAmerican Seed for providing T. erecta seeds.
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Qui, J.A., Castro-Concha, L.A., García-Sosa, K. et al. Is zinniol a true phytotoxin? Evaluation of its activity at the cellular level against Tagetes erecta . J Gen Plant Pathol 76, 94–101 (2010). https://doi.org/10.1007/s10327-010-0222-9
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DOI: https://doi.org/10.1007/s10327-010-0222-9