Abstract:
:To test the morphogenetic role of equilateral stress and physiological confinement in dedifferentiation of epidermal cells, impermeable barriers of goldmetal foil were placed between the postgenitally fusing epidermal surfaces in the gynoecium of Catharanthus roseus (L.) G. Don. Cells contacting the foil barrier were firmly compressed and air spaces were almost eliminated, thus mimicking an internal cellular environment. However, the cells adjacent to the barriers retained epidermal characteristics and did not dedifferentiate. In contrast, epidermal cells that could establish a direct cell-to-cell contact along the margins of the barriers rapidly dedifferentiated as in normal development. The results indicate that neither physical stress on the cell surfaces nor modifications in gradients of gases or volatile products around the cells control the process of epidermal dedifferentiation. The morphogenetic stimulus in this system requires direct cell contact, and may thus consist of a diffusible messenger molecule or some kind of cell surface interaction. Aspects of this cell interaction and of epidermal cell differentiation generally are discussed.
journal_name
Plantajournal_title
Plantaauthors
Walker DBdoi
10.1007/BF00388210subject
Has Abstractpub_date
1978-01-01 00:00:00pages
181-6issue
2eissn
0032-0935issn
1432-2048journal_volume
142pub_type
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