Root parameters of Medicago truncatula . Wild-type (grey columns) and raz (open columns) observed at 10 dpi using WinRhizo Pro. a) number of lateral roots, b) number of nodules, c) root length (cm), d) average root diameter (mm), e) root surface area (cm2), and f) root volume (cm3). Letter rankings indicate differences as determined by Tukey’s HSD at 95% confidence. Bars are standard error. * and † indicated trend evaluated at alpha = 0.1.