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Assimilate Unloading from Maize (Zea mays L.) Pedicel Tissues : II. Effects of Chemical Agents on Sugar, Amino Acid, and C-Assimilate Unloading.
MedLine Citation:
PMID:  16665735     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Sugar, amino acid, and (14)C-assimilate release from attached maize (Zea mays L.) pedicels was studied following treatment with several chemical inhibitors. In the absence of these agents, sugar release was nearly linear over a 7-hour period. At least 13 amino acids were released with glutamine comprising over 30% of the total. Release was not affected by potassium concentration, 10-minute pretreatments with p-chloromercuribenzene sulfonic acid (PCMBS) or dithiothreitol, and low concentrations of CaCl(2). Three hours or more exposure to PCMBS, dinitrophenol, N-ethylmaleimide, or 2,4,6-trinitrobenzene sulfonic acid strongly inhibited (14)C-assimilate, sugar, and amino acid release from the pedicel. These treatments also reduced (14)C-assimilate movement into the kernel bases. It is, therefore, likely that reduced unloading, caused by these relatively long-term exposures to chemical inhibitors, was related to reduced translocation of assimilates into treated kernels. Whether this effect is due to disruption of kernel metabolism and sieve element function or reduced assimilate unloading and subsequent accumulation of unlabeled assimilates within the pedicel tissues cannot be determined at this time.
Authors:
G A Porter; D P Knievel; J C Shannon
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  85     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1987 Oct 
Date Detail:
Created Date:  2010-06-29     Completed Date:  2010-06-29     Revised Date:  2010-09-15    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  558-65     Citation Subset:  -    
Affiliation:
Department of Agronomy, The Pennsylvania State University, University Park, Pennsylvania 16802.
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