The pattern of secondary root formation in curving roots of Arabidopsis thaliana (L.) Heynh.

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Abstract
A gravitational stimulus was used to induce the curvature of the main root of Arabidopsis thaliana. The number of secondary roots increased on the convex side and decreased on the concave side of any curved main root axes in comparison with straight roots used as the control. The same phenomenon was observed with the curved main roots of plants grown on a clinostat and of mutant plants exhibiting random root orientation. The data suggest that the pattern of lateral root formation is asosciated with curvature but is independent of the environmental stimuli used to induce curvature.

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