Fungitoxic effect of scopolin and related coumarins on Sclerotinia sclerotiorum. A way to overcome sunflower head rot |
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| Authors: | E Prats M E Bazzalo A León J V Jorrín |
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| Institution: | (1) Grupo de Investigación Bioquímica Vegetal y Agrícola, Departamento de Bioquímica y Biología Molecular (ETSIAM), Universidad de Córdoba, Campus de Rabanales, Severo Ochoa (C6), 14071 Córdoba, Spain;(2) Advanta Semillas S.A.I.C., Ruta 226, Km 60,5. C.C. 30, 7620 Balcarce, Provincia de Buenos Aires, Argentina;(3) Present address: Departamento de Agronomía y Mejora, IAS-CSIC, Alameda del Obispo, Menendez Pidal s/n. 14080, Córdoba, Spain |
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| Abstract: | Summary The content of coumarins, as probable phytoalexins, was analysed in four sunflower genotypes that ranged in responses to head
rot from highly susceptible to highly resistant. Low levels of all coumarins (scopolin, scopoletin and ayapin) were detected
in the three most susceptible genotypes irrespective of time after inoculation. However, in the resistant genotype there was
a clear time-dependent disease-induced increase of all coumarins that reached a maximum after 10–14 days. Detailed comparison
of the most susceptible and the resistant genotype showed that in the resistant but not the susceptible, scopoletin peroxidase
activity increased during the course of the experiment. Results confirmed a clear negative correlation between coumarin content
and disease symptoms and in particular for scopolin. Furthermore we show for the first time that scopolin is inhibitory to
Sclerotinia at similar doses to scopoletin. As scopolin is known to be less phytotoxic than ayapin and scopoletin, its accumulation may
well confer head rot resistance with minimal plant damage and might be one of the bases for resistance to Sclerotinia. |
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| Keywords: | coumarins Helianthus annuus L phytoalexins Sclerotinia sclerotiorum sunflower |
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