Identification of QTLs regulating root growth angle. A, Mean root angle values across ILs. Asterisks and bar shading indicate corrected significance. Error bars show se. Parent’s values are shown in red (cv M82) and green (S. pennellii). B, Analysis of gravity response in a subset of ILs. Mean root angles were measured before (pre) and after (post) turning growing roots 90°. Angles are not significantly different between treatments (IL 7-4-1: P = 0.15, n = 11; IL 7-5-5: P = 0.68, n = 6; IL 7-5: P = 0.53, n = 8). Red represents roots that grow more like cv M82, and green represents ILs that grow more like S. pennellii.