Resistance from agar medium impacts the helical growth of Arabidopsis primary roots

Journal of the Mechanical Behavior of Biomedical Materials
Jie YanShilei Hao

Abstract

Agar is widely used in studies of root growth since it can be mixed at different concentrations to impact mechanical impedance. At high concentrations (1.2-1.5%), growth of Arabidopsis roots has been found to be wavy, but little research has explored this behavior based on a quantitative understanding of mechanical behavior. To this end, agar media with concentration ranging from 0.5% to 1.2% were prepared to produce gradient resistance during root penetration, and Young's moduli and penetrometer resistance were tested. Arabidopsis roots were then cultivated in these agar media with gradient stiffness. The result showed that Young's modulus increased linearly with the increase of concentration of agar media. For Arabidopsis primary roots, it was preferred to develop a helical pattern in agar media with concentration from 0.5% to 1.0%. As stiffness of agar increased, the percentage of helical roots and helix diameters in each agar medium declined; root lengths and auxin distributions showed variety. We demonstrate that the size of helical deformation decreases with agar stiffness as expected by theoretical analysis based on a combination of growth-induced mechanical buckling. In conclusion, the resistance from agar media impacts...Continue Reading

Citations

Aug 30, 2020·Scientific Reports·Azlan Abdul AzizAbu Samah Zuruzi
Feb 17, 2021·Plant Signaling & Behavior·Xianming FangKai He
Jan 21, 2021·International Journal of Molecular Sciences·Xianming FangKai He

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