Cell division and cell enlargement in isolated Cucurbita cotyledons grown in darkness and in light |
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| Authors: | Stoynova-Bakalova Ekaterina Petrov Peter Tsukaya Hirokazu |
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| Institution: | (1) Acad. M. Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Acad. G. Bonchev street, Block 21, Sofia 1113, Bulgaria,;(2) National Institute for Basic Biology/Center for Integrative Bioscience, Okazaki National Institutes, Okazaki, Japan,;(3) School of Advanced Sciences, the Graduate University for Advanced Studies, Kanagawa, Japan, |
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| Abstract: | The spatial and temporal patterns of post-embryonal cell growth and cell division were characterised in excised cotyledons
of vegetable marrow (Cucurbita pepo L. var. giromontia Alef.) incubated in water. The concurrent roles of these two processes in cotyledon growth were determined using paradermal
sections of the first palisade layer of developing cotyledons. Tissue specificity was observed in the pattern of cell division.
The daughter cells derived from an initial cell, which had already differentiated before imbibition of the seeds, were tightly
packed in a cluster, which enabled us to monitor cell division during early cotyledon development. Heterogeneity of cell size
was recognised during the process of cell proliferation in the cluster, suggesting that cell division is uncoupled from control
of cell size. There was significantly more cell division in the marginal part of the cotyledons than in other parts, suggesting
high activity of the marginal meristem. Light enhanced cell and cotyledon enlargement, but had no effect on the number of
divisions. This study elucidated the cellular basis of post-germinative Cucurbita cotyledon morphogenesis and development.
Electronic Publication |
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| Keywords: | Cell division Cell enlargement Cucurbita cotyledon Light Palisade layer Post-germinative development |
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