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AMYLOPLAST SEDIMENTATION AND ORGANELLE SALTATION IN LIVING CORN COLUMELLA CELLS
Author(s) -
Sack Fred D.,
Suyemoto M. Mitsu,
Leopold A. Carl
Publication year - 1986
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1986.tb09700.x
Subject(s) - amyloplast , organelle , biophysics , biology , cytoplasm , gravitropism , cytoplasmic streaming , clinostat , anatomy , plastid , microbiology and biotechnology , biochemistry , chloroplast , arabidopsis , gene , mutant
Amyloplast sedimentation during gravistimulation and organelle movements was studied in living central rootcap cells of Zea mays L. cv. Merit. Cells from sectioned roots were viewed with a horizontally‐mounted videomicroscope. The kinetics of gravity‐induced amyloplast sedimentation were comparable to those calculated from experiments using fixed material. Individual amyloplasts fell at an average velocity of 5.5 μm min ‐1 ; the maximal velocity of fall measured was 18.0 μm min ‐1 . Amyloplasts often rotated, sometimes rose in the cytoplasm, and occasionally underwent sudden rapid movements as fast as 58 μm min ‐1 . Saltations of other organelles were frequently observed. This appears to be the first report of cytoplasmic streaming in the presumptive statocytes of roots.