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The role of calcium ions in gravity singal perception and transduction
Author(s) -
Poovaiah B. W.,
McFadden J. J.,
Reddy A.S.N.
Publication year - 1987
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1987.tb04363.x
Subject(s) - gravitropism , calmodulin , second messenger system , transduction (biophysics) , calcium , biophysics , atpase , chemistry , signal transduction , microbiology and biotechnology , phosphorylation , enzyme , biochemistry , biology , arabidopsis , gene , organic chemistry , mutant
Ca 2+ is implicated as a messenger in coupling various environmental stimuli, such as gravity and light, to response. In recent years, it has become evident that Ca 2+ plays a central role in all three phases of gravitropism – perception, transduction and response. The root cap, which is known to contain high amounts of Ca 2+ and calmoduin, is the primary site of gravity preeception. The possible role of phosphoinositide turnovr and Ca 2+ and Ca 2+ calmodulin‐dependent enzymes such as Ca 2+ – ATPase and protein kinases in gravitropsim is discussed. A model is proposed to describe the role of Ca 2+ in both normal and light‐dependnt gravity response in roots.