Ascorbic acid (AsA) concentration in ripe fruit from the tomato IL 12-4 and its parental lines. AsA concentration is expressed as μg * g-1 fresh weight (FW). Mean values ± SE are reported for three consecutive greenhouse trials (in 2006, 2007 and 2008). An asterisk indicates that differences between IL 12-4 and S. lycopersicum cv. M82 are statistically significant in Student's t-test. *: 0.001 < P < 0.01; **: P < 0.001.