scholarly journals Structural Sterols Are Involved in Both the Initiation and Tip Growth of Root Hairs in Arabidopsis thaliana

2010 ◽  
Vol 22 (9) ◽  
pp. 2999-3019 ◽  
Author(s):  
Miroslav Ovečka ◽  
Tobias Berson ◽  
Martina Beck ◽  
Jan Derksen ◽  
Jozef Šamaj ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Tip Growth ◽  
Root Hairs

scholarly journals Building a hair: tip growth in Arabidopsis thaliana root hairs

2002 ◽  
Vol 357 (1422) ◽  
pp. 815-821 ◽  
Author(s):  
Rachel J. Carol ◽  
Liam Dolan
Keyword(s):  
Arabidopsis Thaliana ◽  
Reverse Genetics ◽  
Tip Growth ◽  
Fluorescent Protein ◽  
Calcium Influx ◽  
Root Hairs ◽  
New Information ◽  
Active Calcium ◽  
Green Fluorescent

The Arabidopsis thaliana root hair is used as a model for studying tip growth in plants. We review recent advances, made using physiological and genetic approaches, which give rise to different, yet compatible, current views of the establishment and maintenance of tip growth in epidermal cells. For example, an active calcium influx channel localized at the tip of Arabidopsis root hairs has been identified by patch–clamp measurements. Actin has been visualized in vivo in Arabidopsis root hairs by using a green–fluorescent–protein–talin reporter and shown to form a dense mesh in the apex of the growing tip. The kojak gene, which encodes a protein similar to the catalytic subunit of cellulose synthase, is needed in the first stages of hair growth. A role for LRX1 , a leucine–rich repeat extensin, in determining the morphology of the cell wall of root hairs has been established using reverse genetics. The new information can be integrated into a general and more advanced view of how these specialized plant cells grow.

Defective control of growth rate and cell diameter in tip-growing root hairs of the rhd4 mutant of Arabidopsis thaliana

1999 ◽  
Vol 77 (4) ◽  
pp. 494-507 ◽  
Author(s):  
M E Galway ◽  
D C Lane ◽  
J W Schiefelbein
Keyword(s):  
Growth Rate ◽  
Arabidopsis Thaliana ◽  
Cell Wall ◽  
Osmotic Stress ◽  
Tip Growth ◽  
Turgor Pressure ◽  
Root Hairs ◽  
Recessive Mutation ◽  
Cell Diameter ◽  
Hair Diameter

A recessive mutation in the RHD4 gene of Arabidopsis thaliana L. affects the control of tip growth in seedling root hairs. Fully grown rhd4 root hairs are half the length of wild-type (WT) hairs. The hairs are wider, and they vary in diameter during tip growth. Light microscopy and motion analysis revealed that rhd4 hairs grow more slowly and that hair growth rate varies more than in WT hairs. Hair diameter increases at the rhd4 hair tips when tip growth slows. Ultrastructural analysis revealed cell wall thickenings in some mutant hairs. WT hairs were grown in a hyperosmotic medium in an attempt to mimic the rhd4 hairs and investigate the control of root hair morphology. Osmotic stress increased WT hair diameter and induced hair bulging and also increased the diameters of rhd4 hairs. Osmotic stress could disrupt tip growth through reduced turgor pressure and (or) reduced concentrations of cytosolic calcium. Together these results indicate that RHD4 is required to maintain a uniform rate of tip growth in root hairs.Key words: Arabidopsis thaliana, cell wall, cryofixation, mutant, root hairs, tip growth.

scholarly journals Microtubules regulate tip growth and orientation in root hairs of Arabidopsis thaliana

1999 ◽  
Vol 17 (6) ◽  
pp. 657-665 ◽  
Author(s):  
Tatiana N. Bibikova ◽  
Elison B. Blancaflor ◽  
Simon Gilroy
Keyword(s):  
Arabidopsis Thaliana ◽  
Tip Growth ◽  
Root Hairs

scholarly journals Auxin modulates the enhanced development of root hairs in Arabidopsis thaliana (L.) Heynh. under elevated CO2

2011 ◽  
Vol 34 (8) ◽  
pp. 1304-1317 ◽  
Author(s):  
YAOFANG NIU ◽  
CHONGWEI JIN ◽  
GULEI JIN ◽  
QINGYAN ZHOU ◽  
XIANYONG LIN ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Elevated Co2 ◽  
Root Hairs

scholarly journals Arabidopsis CNGC14 Mediates Calcium Influx Required for Tip Growth in Root Hairs

2017 ◽  
Vol 10 (7) ◽  
pp. 1004-1006 ◽  
Author(s):  
Sisi Zhang ◽  
Yajun Pan ◽  
Wang Tian ◽  
Mengqi Dong ◽  
Huifen Zhu ◽  
...  
Keyword(s):  
Tip Growth ◽  
Calcium Influx ◽  
Root Hairs
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