Document Detail


Salt-stress-induced ABA accumulation is more sensitively triggered in roots than in shoots.
MedLine Citation:
PMID:  12379787     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Salt-stress-induced ABA accumulation in maize root tissues was compared with that in leaf tissues. While salt stress with NaCl resulted in a significant ABA accumulation in root tissues (up to 10-fold), the same stress only led to a small ABA accumulation in leaf tissues (about 1-fold). Pretreatment with ethylene glycol (EG), a permeable and inert monomer of PEG, could prevent the shrinkage of cell volume and completely block the ABA accumulation in leaf tissues under salt stress, but substantial salt-induced ABA accumulation was still observed in root tissues following such pretreatment. Hypotonic salt solutions, i.e. below 100 mM NaCl, still induced a significant ABA accumulation (more than 3-fold) in roots, but showed no effect on that in leaf tissues. Results suggest that the salt-stress-induced ABA accumulation in roots may also be triggered by an osmosensing mechanism, which is in addition to the perception of the changes in reduced cellular volume or plasmalemma tension that leads to ABA accumulation in leaves. When leaf and root tissues were immersed into salt solutions, salt entered into the cells as a function of time and salt concentrations. Such entrance apparently led to a loss of sensitivity of leaf tissues to accumulate ABA under the salt stress, and also prevented the leaf tissues from responding to further air-drying in terms of ABA accumulation. Roots showed no such responses. Results suggest that the entrance of salt into leaf cells brought about some toxic effect that might have reduced the capability of leaf cells to produce ABA under dehydration.
Authors:
Wensuo Jia; Youqun Wang; Shuqiu Zhang; Jianhua Zhang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of experimental botany     Volume:  53     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-10-15     Completed Date:  2003-01-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  2201-6     Citation Subset:  IM    
Affiliation:
College of Horticulture, China Agricultural University, Beijing, China.
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MeSH Terms
Descriptor/Qualifier:
Abscisic Acid / antagonists & inhibitors,  metabolism*
Adaptation, Physiological / drug effects
Dose-Response Relationship, Drug
Ethylene Glycol / pharmacology
Plant Roots / drug effects,  growth & development,  metabolism*
Plant Shoots / drug effects,  growth & development,  metabolism*
Sodium Chloride / pharmacology*
Time Factors
Zea mays / drug effects,  growth & development,  metabolism*
Chemical
Reg. No./Substance:
107-21-1/Ethylene Glycol; 21293-29-8/Abscisic Acid; 7647-14-5/Sodium Chloride

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


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