Cellular changes associated with rest and quiescence in winter-dormant vascular cambium of Pinus contorta View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2004-03-12

AUTHORS

K. H. Rensing, A. L. Samuels

ABSTRACT

In winter, dormant cambial cells contain many small vacuoles interspersed throughout the cytoplasm. This differs dramatically from actively growing cambial cells whose structure is dominated by large central vacuoles. Structure reported in studies using conventional chemical fixation and transmission electron microscopy (TEM) conflicts with that described earlier for live cambial cells using light microscopy. In this study, cryofixation (high-pressure freezing/freeze substitution) was used to preserve dormant Pinus contorta fusiform cambial cells, revealing structure more consistent with that in early micrographs of live cambial cells. At the ultrastructural level, the plasmalemma was consistently smooth and tightly associated with the cell wall, contrary to the highly in-folded plasmalemma seen in chemically fixed cambial cells. In addition, both TEM and live-cell confocal microscopy demonstrated that, in some places, dormant cells were partitioned into more numerous, smaller vacuoles than were observed after chemical fixation. Populations of different vacuoles were apparent based on size, shape and membrane staining. Larger vacuoles had prominent tonoplasts and were often present as axially elongated, interconnecting networks with associated microfilament bundles. Endoplasmic reticulum fragmented during rest into numerous vesicular structures similar to small vacuoles, then with the transition to quiescence reformed into the smooth cisternal form. More... »

PAGES

373-380

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00468-003-0314-7

DOI

http://dx.doi.org/10.1007/s00468-003-0314-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1051358322


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