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- W2018392419 abstract "Terminal meristems are responsible for all primary growth of roots. It has been asserted that all cells of root meristems are actively dividing and that the stem cell (proliferative) population expands exponentially. Lengths of cells in roots just proximal to the root cap/root initial boundary were used to determine the numbers of cortex and stele cells in the meristem. Meristem cells were defined as cells that did not have significantly different cell lengths from initial cells at the boundary. Data show that, for five of the six species (Allium cepa, Pisum sativum, Pyrus communis, Triticum aestivum, Vicia faba, and Zea mays) tested, only the first 15 stele and the first 10-35 cortex cells in median longitudinal sections would be in the meristem. For T. aestivum, no discrete meristem was found because all cells proximal to initial cells were longer than initial cells. In addition to this subject area, distributions of lengths of cells in the root meristem using this definition, for the six species were compared with a theoretical cell-age distribution for exponentially dividing cells, to determine if distributions of cell lengths were similar to a theoretical distribution of exponentially dividing cells. For all species tested, distributions of cell lengths were not similar to a theoretical cell-age distribution. From the data of this study with six plant species, we conclude that either contiguous proliferative cell populations of root meristems are very small or the proliferative cell population is not continuous. In addition, such populations do not resemble a theoretical exponential cell-age distribution. Moreover, it seems that the proliferative capacities of cells within terminal root segments differ markedly among species and are not easily characterized." @default.
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- W2018392419 date "2001-02-01" @default.
- W2018392419 modified "2023-09-23" @default.
- W2018392419 title "Diversity of cell lengths in terminal portions of roots: location of the proliferative cell population" @default.
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- W2018392419 doi "https://doi.org/10.1016/s0098-8472(00)00083-6" @default.
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