Document Detail

Characterization of hydrotropism: the timing of perception and signal movement from the root cap in the agravitropic pea mutant ageotropum.
MedLine Citation:
PMID:  11536779     Owner:  NASA     Status:  MEDLINE    
In this study, ageotropum pea mutant was used to determine the threshold time for perception of an osmotic stimulation in the root cap and the time requirement for transduction and transmission of the hydrotropic signal from the root cap to the elongation region. The threshold time for the perception of an osmotic stimulation was compared to current estimates of threshold times for graviperception in roots. The time required for transduction and transmission in the hydrotropic response of ageotropum was compared to the time requirement in the gravity response of Alaska pea roots. We determined that threshold time for perception of an osmotic stimulation in the root cap is very rapid, occurring in less than 2 min following the application of sorbitol to the root cap. Furthermore, a single 5 min exposure of sorbitol to the root cap fully induced a hydrotropic response. We also found that transduction and transmission of an osmotic stimulus requires 90-120 min for movement from the root cap to more basal tissues involved in differential growth leading to root curvature. The very rapid threshold time for perception of root hydrotropism is similar to those times reported for root gravitropism. However, the time required for the transduction and transmission of an osmotic stimulation from the root cap is significantly longer than the time required in gravitropism. These results suggest that there must exist some differences between root hydrotropism and gravitropism in either the rate or mechanisms of transduction and transmission of the tropistic signal from the root cap.
C Stinemetz; H Takahashi; H Suge
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Plant & cell physiology     Volume:  37     ISSN:  0032-0781     ISO Abbreviation:  Plant Cell Physiol.     Publication Date:  1996 Sep 
Date Detail:
Created Date:  1998-03-25     Completed Date:  1998-03-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9430925     Medline TA:  Plant Cell Physiol     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  800-5     Citation Subset:  S    
Biology Department, Rhodes College, Memphis, Tennessee 38112, USA.
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MeSH Terms
Gravitropism / genetics,  physiology
Osmolar Concentration
Peas / genetics,  growth & development,  physiology*
Plant Root Cap / genetics,  growth & development,  physiology*
Plant Roots / genetics,  growth & development,  physiology
Signal Transduction / genetics,  physiology*
Time Factors
Tropism / genetics,  physiology*
Reg. No./Substance:
50-70-4/Sorbitol; 7732-18-5/Water

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

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