Fig. 3.

Network of metabolic QTL influencing grain carotenoid concentrations in populations DEexp × CI7 and A619 × SC55. QTL are shown for univariate (single carotenoid concentration) and multivariate (PC) traits mapping to locations of genes known to be in the carotenoid or precursor pathways (overlap delimited by black squares). Correlated trait effects are shown for all PC traits, where colored squares indicate the carotenoids which are best described by a given PC; the presence of only blue squares shows that these carotenoid variation described by a single PC covaries proportionally, whereas presence of blue and red squares indicates an inverse covariation between the carotenoids described by that PC (color figure online)