Table 1.

Flavonoid aglycones in 18-week old red cv. Firecracker, kfoA, kfoB and nco lettuce grown under cool fluorescent lights. Acid hydrolysis was used to convert compounds to aglycones.

Lines	Cyanidin	Quercetin	Kaempferol	Naringenin	Pelargonidin	Total polyphenol
cv. Firecracker	5.3 ± 2.5 (57.49 ± 26.41)	26.0 ± 2.5 (281.53 ± 47.83)	<0.02 BQ	<0.04 BQ	<0.2 BQ	45.00 ± 8.51
kfoA	<0.02 BQ (<0.18)	<0.02 BQ (<0.18)	10.9 ± 2.9 (102.62 ± 32.47)	<0.04 BQ	0.30 ± 0.1 (3.38 ± 2.18)	23.33 ± 7.45
kfoB	0.14 ± 0.01 (1.80 ± 0.29)	0.3 ± 0.2 (3.79 ± 2.15)	6.4 ± 1.5 (83.41 ± 25.31)	<0.04 BQ	0.58 ± 0.2 (7.42 ± 2.41)	44.87 ± 3.75
nco	<0.02 BQ (<0.18)	0.6 ± 0.2 (5.59 ± 1.34)	<0.02 BQ (<0.18)	10.4 ± 2.5 (92.73 ± 22.81)	<0.02 BQ	36.29 ± 8.57

Mean mg compound/ g dry leaf weight, and, in parenthesis, as mg compound/ 100 g fresh leaf weight ± standard deviation is shown for cv. Firecracker (n = 6), kfoA, kfoB and nco (n = 10). Pelargonidin was quantified in cyanidin equivalents. Total polyphenol content is calculated as gallic acid (GA) equivalent in mg GA/ g dry leaf weight. BQ, below quantification limits. Naringenin chalcone glycosides were converted to naringenin during acid hydrolysis.