期刊
NATURE CELL BIOLOGY
卷 13, 期 8, 页码 973-U227出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncb2294
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资金
- Department of Energy [DE-FG02-07ER15887]
- National Science Foundation [0937323]
- U.S. Department of Energy (DOE) [DE-FG02-07ER15887] Funding Source: U.S. Department of Energy (DOE)
- Directorate For Engineering [0937323] Funding Source: National Science Foundation
- Emerging Frontiers & Multidisciplinary Activities [0937323] Funding Source: National Science Foundation
In plants, cell shape is defined by the cell wall, and changes in cell shape and size are dictated by modification of existing cell walls and deposition of newly synthesized cell-wall material(1). In root hairs, expansion occurs by a process called tip growth, which is shared by root hairs, pollen tubes and fungal hyphae(1). We show that cellulose-like polysaccharides are present in root-hair tips, and de novo synthesis of these polysaccharides is required for tip growth. We also find that eYFP-CSLD3 proteins, but not CESA cellulose synthases, localize to a polarized plasma-membrane domain in root hairs. Using biochemical methods and genetic complementation of a csld3 mutant with a chimaeric CSLD3 protein containing a CESA6 catalytic domain, we provide evidence that CSLD3 represents a distinct (1 -> 4)-beta-glucan synthase activity in apical plasma membranes during tip growth in root-hair cells.
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