Regulation of cell reproduction in bud meristems ofTradescantia paludosa
作者:
Kyu-Byung Yun,
J. M. Naylor,
期刊:
Canadian Journal of Botany
(NRC Available online 1973)
卷期:
Volume 51,
issue 6
页码: 1137-1145
ISSN:0008-4026
年代: 1973
DOI:10.1139/b73-144
出版商: NRC Research Press
数据来源: NRC
摘要:
The mitotic cycle can be arrested in the apical summit of vegetative terminal buds ofTradescantia paludosaby restricting the level of nitrogen or light available to the plant. Cells in this portion of the bud are much more sensitive to these stress conditions than those in the subjacent portion of the meristem. This differential response induced the establishment of a quiescent "central zone" which is distinguished from the rest of the meristem by the apparent absence of mitosis and DNA synthesis, larger nuclear volume, and a lower histone content of chromatin. These features are identical with those imposed by apical dominance in apices of inhibited lateral buds.The results support the view that competition for nutrients is an important causal factor in apical dominance. They suggest also that competition for nutrients within the terminal bud meristem is important in the regulation of growth in vegetative shoots in respones to conditions of the environment.
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