Root hair development involves asymmetric cell division in Brachypodium distachyon and symmetric division in Oryza sativa
Root hair development involves asymmetric cell division in Brachypodium distachyon and symmetric division in Oryza sativa
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DOI：
10.1111/j.1469-8137.2011.03839.x
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发表时间：
2011-01-01
期刊：
影响因子：
9.4
通讯作者：
Dolan, Liam
中科院分区：
文献类型：
--
作者：
Kim, Chul Min;Dolan, Liam
大多数被子植物的根表皮由毛(H)细胞和非毛(N)细胞组成。在禾本科牧草中，H细胞比N细胞短。本研究的目的是确定禾本科牧草Brachypodium disachyon和Oryza sativon中H细胞和N细胞大小差异的发育基础。较小的子细胞变成H细胞，较大的细胞形成N细胞。相反，在水稻H细胞和N细胞的发育过程中不会发生不对称的胞质分裂，其大小的差异是由于根毛起始后N细胞中的细胞扩张多于H细胞所致。我们推测，在H和N细胞的发育过程中，包括不对称胞质分裂的机制是在这个亚家族的Pooideae或祖先之间进化的。
The root epidermis of most angiosperms comprises hair (H) cells and nonhair (N) cells. H cells are shorter than N cells in grasses (Poaceae).The aim of this study was to determine the developmental basis for differences in H and N cell size in the grasses Brachypodium distachyon and Oryza sativa.We show that cytokinesis in the last cell division in each epidermal file is asymmetric in B. distachyon. The smaller daughter cell becomes an H cell and the larger cell forms an N cell. By contrast, asymmetric cytokinesis does not occur during H cell and N cell development in O. sativa and the differences in size arise because there is more cell expansion in N cells than in H cells after root hair initiation.The different sizes of mature H and N cells result from cell division asymmetry in B. distachyon but different rates of cell expansion in O. sativa. We hypothesize that the mechanism that includes asymmetric cytokinesis during the development of H and N cells evolved among the Pooideae or ancestors of this subfamily.