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Author von Dassow, Michelangelo ♦ Odell, Garret M. ♦ Mandoli, Dina F.
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2001
Language English
Subject Domain (in DDC) Social sciences ♦ Sociology & anthropology
Abstract With carbon particles we analyzed patterns of growth in Acetabularia acetabulum (Lam.) P.C. Silva, a giant unicell famous for classic development studies. We focussed on the stalk apex, which generates the stalk, whorls of hairs, and whorls of gametophores. To gain visual and physical accessibility, we amputated the youngest whorls of hairs and the original apex and performed experiments on the apex that regenerated. Video analysis indicated that most growth occurred near the tip of the new apex. Less growth occurred throughout the cut-interwhorl. We also analyzed cell wall thickness along stalks cleared of cytoplasm. Correlating growth data to wall morphology suggests growth near the apex may be proportional to stress on the cell wall. We propose that turgor-pressure wall stress modulates local apical cell wall growth rates. A supplementary model, relating cell wall curvature and growth rate in the cut-interwhorl, characterizes how the stalk's final dimensions and nearly cylindrical shape may arise. See for supplementary data, analysis, and mathematical appendices. We believe this is the first quantitative description of apex morphogenesis of A. acetabulum.
ISSN 00320935
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2001-04-26
Publisher Place Berlin/Heidelberg
e-ISSN 14322048
Journal Planta
Volume Number 213
Issue Number 4
Page Count 8
Starting Page 659
Ending Page 666

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Source: SpringerLink