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Influence of root tip geometry and root diameter on root elongation rate determined in 14 wheat genotypes (n = 6). Linear regressions are shown between root elongation rate and inverse shape factor (iSF; calculated using root tip radius [r] and length [l]) of a cone (A) and a spheroid (B) geometry and root diameter (C). Black, orange, and red symbols represent soil bulk density of 1.3, 1.45, and 1.6 g cm−3, respectively. Asterisks denote significant regression at P < 0.05.
