Root Hairs: Cell and Molecular Biology
Robert William Ridge, Anne Mie C. Emons
Springer, Jan 1, 2000 - Science - 336 pages
Root hairs are tip-growing cells that originate from epidennal cells called trichoblasts. Their role may be simply thought of as extending the surface area of the root to facilitate absorption of nutrients and water. However, as you will see in this book, the root hair is far more than that. To an increasingly larger number of plant biologists, the root hair is a model cell. It grows in much the same way as a pollen tube, by sending vast numbers of vesicles containing cell wall precursors to a rounded apical dome, the tip. Once the trichoblast becomes committed to root hair fonnation, it no longer divides. The root hair cell has a migrating nucleus and a complex cytoskeleton. It has a varied cell wall. It is easy to observe through differential interference contrast microscopy because there are no other cells around it to disturb the image. Cytoplasmic streaming is exceptionally clear, and amyloplasts and even mitochondria and endoplasmic reticulum can be seen without reporter labelling in some species. Root hair mutants are easy to distinguish and catalogue. Plant honnones are involved in their growth and development. It is thus an almost ideal plant cell for experimental manipulation and observation. The root hair is also involved in interactions with soil microbes, as you will learn from later chapters of the book.
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acid actin cytoskeleton actin filament bundles activity alfalfa apical Arabidopsis thaliana auxin Bibikova Bisseling Ca2+ calcium Cell Biol cell wall concentration confocal cytoplasmic streaming cytoskeleton cytosolic Derksen differentiation dry cleaving emission Emons AMC epidermal cells Equisetum hyemale ethylene excitation factors FB-actin Felle HH fixation fluorescence lifetime formation Frankia fungal Gadella gene gradient growing root hairs Heidstra Hepler hormones hyphae induced infection thread inhibition interactions intracellular Kondorosi LCOs lectin legume Masucci Medicago membrane potential microelectrodes microtubules molecular molecules morphogenesis mutant Nod-factors nodulation nutrient orientation plant cells Plant Physiol plasma membrane pollen tubes probe profilin protein proton Protoplasma regulation response rhizobia Rhizobium role root epidermis root hair cell root hair deformation root hair development root hair growth root hair tip root hairs Ruijter Schiefelbein signal transduction specific symbiosis technique tip growth tip-growing Traas transport trichoblasts uptake vacuole vesicles Vicia sativa voltage