Phenylpropanoid compounds accumulated in yellow and white muskmelon fruit rinds and their corresponding biosynthesis pathway. Six compounds were specifically accumulated in the NarCh-accumulating lines (framed in yellow): NarCh, naringenin, luteolin, dihydrokaempferol, kaempferol, and quercetin. Three compounds were found to be specifically accumulated in the non-NarCh-accumulating lines (framed in blue): caffeic acid, ferulic acid, and aesculetin. C3H, 4-Coumarate 3-hydroxylase; C4H, cinnamate 4-hydroxylase; CHI, chalcone isomerase; COMT, caffeic acid 3-O-methyltransferase; F3H, naringenin 3-hydroxylase; FNS, flavone synthase; FLS, flavonol synthase.