ACTIN MICROFILAMENTS IN PRESUMPTIVE STATOCYTES OF ROOT CAPS AND COLEOPTILES
作者:
R. G. White,
F. D. Sack,
期刊:
American Journal of Botany
(WILEY Available online 1990)
卷期:
Volume 77,
issue 1
页码: 17-26
ISSN:0002-9122
年代: 1990
DOI:10.1002/j.1537-2197.1990.tb13523.x
出版商: Wiley
数据来源: WILEY
摘要:
Rhodamine‐phalloidin was used to determine the distribution of actin microfilament bundles (mfb) in cells thought to be the site of gravity perception (statocytes) in coleoptiles and root caps ofZea maysandHordeum vulgare.In coleoptile cells, amyloplasts were usually observed in close proximity to thick mfb, which often appeared to divide into finer mfb adjacent to individual amyloplasts. The nucleus in these cells was surrounded by an extensive network of mfb, which were connected to thicker transvacuolar mfb. Columella cells of the root cap contained an extensive reticulum of fine mfb throughout the protoplast, but lacked the much thicker mfb seen in coleoptile cells. The distribution and extent of mfb observed in fixed cells correlates with patterns of streaming and amyloplast movement seen in living cells. A possible role for actin mfb in the perception of gravity is discussed.
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