New aspects of gravity responses in plant cells.

摘要: Plants show two distinct responses to gravity: gravity-dependent morphogenesis (gravimorphogenesis) and gravity resistance. In gravitropism, a typical mechanism of gravimorphogenesis, is utilized as signal establish an appropriate form. The response has been studied in gravity-free environment, where plant seedlings were found perform spontaneous morphogenesis, termed automorphogenesis. Automorphogenesis consists change growth direction curvature dorsiventral directions. caused by difference the capacity cell wall expand between dorsal ventral sides organs, which originates from inherent structural anisotropy. Gravity resistance that enables develop against gravitational force. To resist force, constructs tough body increasing rigidity suppresses growth. mechanical properties are changed modification metabolism especially pH. perceived amyloplasts statocytes, whereas may be mediated mechanoreceptors on plasma membrane.