Abstract
Caulerpa prolifera (Chlorophyta) exhibits a gravimorphogenetic response to inversion by switching the site of new rhizoid initiations to correspond with the new direction of the gravity stimulus. When plants were fixed at 6 and 24 h after being held in either a normal or an inverted position the switch in the site of organ differentiation, upon inversion, was found to be preceded by the accumulation of starch-containing amyloplasts on the bottom of the rhizome. Approximately 1.5–2.0 times as many amyloplasts were found at the bottom of normal or inverted rhizomes as compared with the top in a region extending from 200 to 1,000 μm behind the rhizome tip. All new rhizoid initials were located in the region of amyloplast accumulation and each rhizoid initial contained numerous amyloplasts.
Abbreviations
- PAS:
-
periodic acid-Schiff reagent
References
Audus, L.J. (1979) Plant geosensors. J. Exp. Bot. 30, 1051–107
Berlyn, G.P., Miksche, J.P. (1976) Botanical microtechnique and cytochemistry. Iowa State University Press, Ames
Buggeln, R.G. (1981) Morphogenesis and growth regulators In: The biology of seaweeds, pp. 627–660, Lobban, C.S., Wynne, M.J., eds. University of California Press, Berkeley Los Angeles
Chen, J.C.W., Jacobs, W.P. (1966) Quantitative study of development of the giant coenocyte, Caulerpa prolifera. Am. J. Bot 53, 413–423
Dawes, C.J., Barilotti, D.C. (1969) Cytoplasmic organization and rhythmic streaming in growing blades of Caulerpa prolifera. Am. J. Bot. 56, 8–15
Dawes, C.J., Rhamstine, E.L. (1967) An ultrastructural study of the giant green algal coenocyte, Caulerpa prolifera. J. Phycol 3, 117–126
Haberlandt, G. (1906) Über den Geotropismus von Caulerpaprolifera. Sitzungsber. Akad. Wiss. Wien Math.-Naturwiss. Kl. 115, 577–598
Jacobs, W.P., Olson, J. (1980) Developmental changes in the algal coenocyte Caulerpa prolifera (Siphonales) after invizsion with respect to gravity. Am. J. Bot. 67, 141–146
Juniper, B.E. (1976) Geotropism. Annu. Rev. Plant Physiol. 27, 385–406
Matilsky, M.B. (1982) Redistribution of amyloplasts in invert Caulerpa prolifera rhizome tips. (Abstr.) Physiologist 25, 233
Nägeli, C. (1844) Caulerpa prolifera Ag. Z. Wiss. Bot. von Schleiden und Nägeli 1, 134–167
Sabnis, D.D. (1969) Observations on the ultrastructure of the coenocytic marine alga Caulerpa prolifera, with particulareference to some unusual cytoplasmic components. Phycologia 7, 24–42
Schröter, K., Läuchli, A., Sievers, A. (1975) Mikroanalytische Identifikation von Bariumsulfat-Kristallen in den Statolithen der Rhizoide von Chara fragilis, Desv. Planta 122 213–225
Sievers, A., Schröter, K. (1971) Versuch einer Kausalanalyse der geotropischen Reaktionskette im Chara-Rhizoid. Planta 96, 339–353
Sievers, A., Volkmann, D. (1977) Ultrastructure of gravity-penceiving cells in plant roots. Proc. R. Soc. London Ser. 199, 525–536
Zimmermann, W. (1929) Experimente zur Polarität von Coulerpa und zum allgemeinen Polaritätsproblem. Roux Arc Entw. Mech. Organ. 116, 669–688
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Matilsky, M.B., Jacobs, W.P. Accumulation of amyloplasts on the bottom of normal and inverted rhizome tips of Caulerpa prolifera (Forsskål) Lamouroux. Planta 159, 189–192 (1983). https://doi.org/10.1007/BF00392992
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DOI: https://doi.org/10.1007/BF00392992