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Patterns of Assimilate Production and Translocation in Muskmelon (Cucumis melo L.) : II. Low Temperature Effects.
MedLine Citation:
PMID:  16669026     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Muskmelon (Cucumis melo L.) plants were exposed to a 10 degrees C chilling treatment for 72 hours, which induced leaf chilling injury symptoms (wilting, appearance of water-soaked areas, necrosis). Chilling caused an accumulation of starch, sucrose, hexoses (glucose and fructose), and certain amino acids (glutamate, aspartate, and citrulline) in source leaf tissues, but no accumulation of stachyose or other galactosyl-oligosaccharides occurred. Chilling also caused a general increase in sugar (stachyose, raffinose, sucrose) and amino acid content of the phloem sap, although rates of phloem transport were apparently reduced. Pretreatment of the leaves with a 20-milligram per liter abscisic acid (ABA) spray before chilling prevented the appearance of chilling injury symptoms. ABA pretreatment had little or no affect on sugar accumulation in leaf tissues but greatly reduced or eliminated the chilling-induced amino acid accumulation. Higher levels of aspartate and particularly of arginine were found in phloem saps from ABA-pretreated plants. The data indicate that changes in leaf metabolism caused by environmental stresses such as chilling may change the composition of cucurbit phloem sap. This raises the possibility that some of the deleterious effects of stress on sink tissues may, in part, be due to alterations in the nature of the assimilate supply.
Authors:
D E Mitchell; M A Madore
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  99     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1992 Jul 
Date Detail:
Created Date:  2010-06-29     Completed Date:  2010-07-06     Revised Date:  2010-09-15    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  966-71     Citation Subset:  -    
Affiliation:
Department of Botany and Plant Sciences, University of California, Riverside, California 92521.
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