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Root hair development involves asymmetric cell division in Brachypodium distachyon and symmetric division in Oryza sativa
Author(s) -
Kim Chul Min,
Dolan Liam
Publication year - 2011
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2011.03839.x
Subject(s) - brachypodium distachyon , cytokinesis , cell division , oryza sativa , biology , brachypodium , botany , microbiology and biotechnology , root hair , asymmetric cell division , plant cell , epidermis (zoology) , cell , genetics , anatomy , genome , gene
Summary• 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.