The right-handed slanting of Arabidopsis thaliana roots is due to the combined effects of positive gravitropism, circumnutation and thigmotropism.

Abstract excerpt

When primary Arabidopsis roots grow down a tilted agar plate, they do not elongate following the gravitational vector along a straight line, but instead they slant noticeably to the right-hand. This process is seen mostly in the ecotypes Wassilewskjia and Landsberg, whereas it is attenuated in the ecotype Columbia, and in some mutants is even inverted. The origin of the slanting of Arabidopsis roots, that...

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