Plants can reorient their growth direction by sensing organ tilt relative to the direction of gravity. With respect to gravity sensing in gravitropism, the classic starch statolith hypothesis, i. Several lines of experimental evidence have demonstrated that starch is important but not essential for gravity sensing and have suggested that it is reasonable to regard plastids containers of starch as statoliths. Although the word statolith means sedimented stone, actual amyloplasts are not static but instead possess dynamic movement. Recent studies combining genetic and cell biological approaches, using Arabidopsis thaliana, have demonstrated that amyloplast movement is an intricate process involving vacuolar membrane structures and the actin cytoskeleton.
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Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Plants can reorient their growth direction by sensing organ tilt relative to the direction of gravity.
With respect to gravity sensing in gravitropism, the classic starch statolith hypothesis, i. View PDF. Save to Library. Create Alert. Launch Research Feed. Share This Paper. Figures and Topics from this paper. Paper Mentions. Feel the force! AoB Blog. Ups and Downs. New York Times. Citations Publications citing this paper. Actin cytoskeleton rearrangements during the gravitropic response of Arabidopsis roots G. Pozhvanov , D. Suslov , Sergey S. AtLAZY1 is a signaling component required for gravitropism of the Arabidopsis thaliana inflorescence.
Takeshi Yoshihara , Edgar P. Gravireceptors in eukaryotes—a comparison of case studies on the cellular level Donat-P. Role of the plant cell wall in gravity resistance. Plant Sci. References Publications referenced by this paper. Live-cell imaging indicated vacuolar membrane dynamics are involved in amyloplast dynamics in Arabidopsis shoot gravitropism. Tasaka Plant Cell —58 Involvement of the Vacuoles of the Endodermis in the Early Process of Shoot Gravitropism in Arabidopsis Article, publication date, and citation information can be found at www.
Interaction of actin and the chloroplast protein import apparatus. Juliette Jouhet , J. Human RME-8 is involved in membrane trafficking through early endosomes. Valster , Elison B Blancaflor Engineering Signal Transduction in Gravitropism Benjamin R.
Gravitropism also known as geotropism is a coordinated process of differential growth by a plant or fungus in response to gravity pulling on it. Gravity can be either "artificial gravity" or natural gravity. It is a general feature of all higher and many lower plants as well as other organisms. Charles Darwin was one of the first to scientifically document that roots show positive gravitropism and stems show negative gravitropism. This behavior can be easily demonstrated with any potted plant. When laid onto its side, the growing parts of the stem begin to display negative gravitropism, growing biologists say, turning; see tropism upwards. Hebaverns non-woody stems are capable of a small degree of actual bending, but most of the redirected movement occurs as a consequence of root or stem growth outside.
Directional Gravity Sensing in Gravitropism