Linked Life Data

15692180

Source:http://linkedlifedata.com/resource/pubmed/id/15692180

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2005-2-4
pubmed:abstractText
It is usually suggested that either H(2)O(2) or NO function as a signal molecule in mediating the ABA-induced stomatal closure of guard cells, but there has been no report on the relationship between H(2)O(2) and NO in ABA signal transduction pathway. Here, using stomatal analysis and laser scanning cofocal microscope techniques, we show firstly that NO functions as a downstream intermediate of H(2)O(2) signaling to mediate ABA-induced stomatal closure in Vicia faba L. Sodium nitroprusside (SNP, a NO donor) and H(2)O(2) can mimic the effects of ABA on stomatal closure. Carboxy-PTIO (c-PTIO, a specific scavenger of NO) partly reverse the stomatal closure induced by ABA or H(2)O(2), while catalase (CAT), a H(2)O(2) scavenger, failed to reverse the NO-induced aperture reduction in Vicia faba guard cells. Monitoring the changes in both NO and H(2)O(2) generation in guard cells by using fluorescent probe of NO or H(2)O(2), DAF-2DA or H2DCFDA, respectively, we found that the generating rate of H(2)O(2) in guard cells was faster than that of NO after being treated with ABA 10 micromol/L. CAT almost completely inhibited the increase in DAF fluorescence induced by ABA. Similar to ABA, exogenous H(2)O(2) provoked the production of NO. c-PTIO slightly enhanced the fluorescent intensity of DCF stimulated by ABA, while exogenous SNP did not increase DCF fluorescence in guard cells. Taken together, these results suggest that H(2)O(2) could probably act as upstream component of NO signaling and NO negatively regulate H(2)O(2) generation during ABA-induced stomatal closure in guard cells.
pubmed:language
chi
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1671-3877
pubmed:author
pubmed:issnType
Print
pubmed:volume
31
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
62-70
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
[NO may function in the downstream of H2O2 in ABA-induced stomatal closure in Vicia faba L].
pubmed:affiliation
College of Life Sciences, Henan University, Kaifeng 475001, China.
pubmed:publicationType
Journal Article, English Abstract, Research Support, Non-U.S. Gov't