Effect of Scoparone (6,7-Dimethoxycoumarin) Biosynthesis on the Resistance of Tangelo Nova,<i>Citrus paradisi</i>, and<i>Citrus aurantium</i>Fruits against<i>Phytophthora parasitica</i>

Abstract

The biosynthesis of scoparone (6,7-dimethoxycoumarin) was associated with resistance of mature fruits of tangelo Nova, Citrus aurantium, and Citrus paradisi to infection by Phytophthora parasitica . Levels of scoparone increased by treating fruit with Brotomax, which also enhanced the resistance of fruit to the fungus. Lesion development was reduced by as much as 40%. Scoparone is therefore proposed as a possible phytoalexin in fruits of these cultivars. Keywords: Citrus; coumarin; phytoalexin; scoparone