Document Detail

Interactions between auxin transport and the actin cytoskeleton in developmental polarity of Fucus distichus embryos in response to light and gravity.
MedLine Citation:
PMID:  15122028     Owner:  NLM     Status:  MEDLINE    
Land plants orient their growth relative to light and gravity through complex mechanisms that require auxin redistribution. Embryos of brown algae use similar environmental stimuli to orient their developmental polarity. These studies of the brown algae Fucus distichus examined whether auxin and auxin transport are also required during polarization in early embryos and to orient growth in already developed tissues. These embryos polarize with the gravity vector in the absence of a light cue. The auxin, indole-3-acetic acid (IAA), and auxin efflux inhibitors, such as naphthylphthalamic acid (NPA), reduced environmental polarization in response to gravity and light vectors. Young rhizoids are negatively phototropic, and NPA also inhibits rhizoid phototropism. The effect of IAA and NPA on gravity and photopolarization is maximal within 2.5 to 4.5 h after fertilization (AF). Over the first 6 h AF, auxin transport is relatively constant, suggesting that developmentally controlled sensitivity to auxin determines the narrow window during which NPA and IAA reduce environmental polarization. Actin patches were formed during the first hour AF and began to photolocalize within 3 h, coinciding with the time of NPA and IAA action. Treatment with NPA reduced the polar localization of actin patches but not patch formation. Latrunculin B prevented environmental polarization in a time frame that overlaps the formation of actin patches and IAA and NPA action. Latrunculin B also altered auxin transport. Together, these results indicate a role for auxin in the orientation of developmental polarity and suggest interactions between the actin cytoskeleton and auxin transport in F. distichus embryos.
Haiguo Sun; Swati Basu; Shari R Brady; Randy L Luciano; Gloria K Muday
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2004-04-30
Journal Detail:
Title:  Plant physiology     Volume:  135     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-05-13     Completed Date:  2004-10-14     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  266-78     Citation Subset:  IM; S    
Department of Biology, Wake Forest University, Winston-Salem, North Carolina 27109-7325, USA.
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MeSH Terms
Actins / metabolism*
Bicyclo Compounds, Heterocyclic / pharmacology
Biological Transport / drug effects,  physiology,  radiation effects
Cytoskeleton / metabolism*
Fucus / drug effects,  growth & development*,  radiation effects
Gravitropism / physiology*
Indoleacetic Acids / antagonists & inhibitors,  metabolism*,  pharmacology
Phototropism / physiology
Phthalimides / pharmacology
Seeds / drug effects,  growth & development*,  radiation effects
Thiazoles / pharmacology
Reg. No./Substance:
0/Actins; 0/Bicyclo Compounds, Heterocyclic; 0/Indoleacetic Acids; 0/Phthalimides; 0/Thiazoles; 0/Thiazolidines; 306R88V86P/alpha-naphthylphthalamic acid; 6U1S09C61L/indoleacetic acid; 76343-94-7/latrunculin B
G K Muday / Wake Forest U, Winston-Salem, NC

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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