Anisotropic growth is achieved through the additive mechanical effect of material anisotropy and elastic asymmetry

摘要: Fast directional growth is a necessity for the young seedling: after germination, seedling needs to quickly reach through soil begin its autotrophic life. In most dicot plants, this rapid escape due anisotropic elongation of hypocotyl, columnar organ between root and shoot meristems. Anisotropic common in plant organs canonically attributed cell wall anisotropy produced by oriented cellulose fibers. Recently, mechanism based on asymmetric pectin-based elasticity has been proposed. Here we present harmonizing model control dark-grown Arabidopsis hypocotyl: basic information provided orientation) additive elastic asymmetry epidermis. We quantitatively show that hypocotyl from germination. experimental evidence pectin biochemical differences mechanics providing important regulation hypocotyl. Lastly, our silico modelling experiments indicate an combination biochemistry orientation promoting growth.