Document Detail

Root-shoot interaction in the greening of wheat seedlings grown under red light.
MedLine Citation:
PMID:  11536685     Owner:  NASA     Status:  MEDLINE    
Wheat seedlings grown with roots exposed to constant red light (300-500 micromoles m-2 s-1) did not accumulate chlorophyll in the leaves. In contrast, seedlings grown with their roots shielded from light accumulated chlorophylls. Chlorophyll biosynthesis could be induced in red-light-grown chlorophyll-deficient yellow plants by either reducing the red-light intensity at the root surface to 100 micromoles m-1 s-1 or supplementing with 6% blue light. The inhibition of chlorophyll biosynthesis was due to impairment of the Mg-chelatase enzyme working at the origin of the Mg-tetrapyrrole pathway. The root-perceived photomorphogenic inhibition of shoot greening demonstrates root-shoot interaction in the greening process.
B C Tripathy; C S Brown
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Plant physiology     Volume:  107     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1995 Feb 
Date Detail:
Created Date:  1998-07-01     Completed Date:  1998-07-01     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  407-11     Citation Subset:  S    
National Aeronautics and Space Administration, Kennedy Space Center, Florida 32899, USA.
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MeSH Terms
Chlorophyll / biosynthesis*
Dose-Response Relationship, Radiation
Evaluation Studies as Topic
Germination / radiation effects
Lyases / metabolism
Plant Leaves / growth & development,  metabolism,  radiation effects
Plant Roots / enzymology,  growth & development,  metabolism*,  radiation effects
Plant Shoots / enzymology,  growth & development,  metabolism*,  radiation effects
Protochlorophyllide / biosynthesis
Protoporphyrins / biosynthesis
Triticum / enzymology,  growth & development,  metabolism*,  radiation effects
Reg. No./Substance:
0/Protoporphyrins; 1406-65-1/Chlorophyll; 14947-11-6/magnesium protoporphyrin; 16053-68-2/protoporphyrin IX monomethyl ester; 20369-67-9/Protochlorophyllide; EC 4.-/Lyases; EC 4.99.1-/magnesium chelatase
C S Brown / NASA KSC

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