Complex physiological and molecular processes underlying root gravitropism

摘要: Gravitropism allows plant organs to guide their growth in relation the gravity vector. For most roots, this response downward into soil where water and nutrients are available for development. The primary site sensing roots includes root cap appears involve sedimentation of amyloplasts within columella cells. This process triggers a signal transduction pathway that promotes both an acidification wall around cells, alkalinization cytoplasm, development lateral polarity across establishment auxin gradient. gradient is then transmitted elongation zones it differential cellular on opposite flanks central zone, responsible part gravitropic curvature. Recent findings also suggest involvement secondary site/mechanism gravitropism possibility early phases graviresponse, which distal might be independent review discusses our current understanding molecular physiological mechanisms underlying these various roots.