Optically-assessed preformed flavonoids and susceptibility of grapevine to Plasmopara viticola under different light regimes

Functional Plant Biology : FPB
Giovanni AgatiSimone Orlandini

Abstract

The role of flavonoids in the response of plants to Plasmopara viticola, the phytopathogen agent of downy mildew, was studied in the Vitis vinifera L. cultivar Sangiovese. Grapevines in the vineyard were exposed to two light regimes, 100% and 35% of full sunlight in order to induce differences in total leaf polyphenolic content. Epidermal leaf phenolic compounds were assessed optically, using the Dualex chlorophyll fluorescence-based portable leaf-clip. Dualex data were calibrated by means of HPLC analysis of extracts from the same measured leaves. Good correlations were obtained with total flavonoid contents, which consist mainly of quercetin 3-O-glucuronide. From the Dualex non-destructive measurements, we showed that full-sun exposed leaves contained 75% more flavonoids than shaded leaves. Inoculation of leaves with P. viticola sporangia resulted in a significantly lower infected leaf area in sun-lit leaves compared with shaded ones, as seen from subsequent analysis of the downy mildew severity. These results indicated an inverse relationship between preformed flavonoids and the susceptibility of grapevines to downy mildew. The rapid optical method for the non-destructive assessment of flavonoids presented here could be usef...Continue Reading

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Citations

Dec 6, 2012·Journal of Experimental Botany·Sébastien BellowZoran G Cerovic
Jan 22, 2013·Physiologia Plantarum·Paul W BarnesRonald J Ryel
May 13, 2017·Frontiers in Plant Science·Walter ChitarraGiorgio Gambino
Mar 23, 2010·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Anthony AndradyRichard G Zepp
Mar 7, 2020·Frontiers in Plant Science·Saara Maria HartikainenThomas Matthew Robson
Jul 3, 2021·International Journal of Molecular Sciences·Igor D VukelićDejana M Panković

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