Abstract
A number of studies have demonstrated beta-amylase induction in response to abiotic stress. In the present work, a temperature response profile in 5 degrees C increments from 45 degrees C to 0 degrees C showed that induction at temperature extremes was specific for two members of the gene family (BMY7 and BMY8). Both members encode proteins that possess apparent transit peptides for chloroplast stromal localization. However, induction was not observed for other key starch degrading enzymes demonstrating a rather specific response to temperature stress for BMY7 and BMY8. Time course experiments for heat shock at 40 degrees C and cold shock at 5 degrees C showed that beta-amylase induction correlated with maltose accumulation. Maltose has the ability, as demonstrated by in vitro assays, to protect proteins, membranes, and the photosynthetic electron transport chain at physiologically relevant concentrations. Therefore, beta-amylase induction and the resultant maltose accumulation may function as a compatible-solute stabilizing factor in the chloroplast stroma in response to acute temperature stress.
MeSH Terms
Base Sequence
Chloroplasts/drug effects,enzymology
DNA Primers
Enzyme Induction
Kinetics
Maltose/pharmacology
Reverse Transcriptase Polymerase Chain Reaction
Temperature
Thermodynamics
beta-Amylase/biosynthesis,genetics
Chemicals
DNA Primers
Maltose
beta-Amylase
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Kaplan Fatma
Plant Molecular and Cellular Biology Program, Department of Environmental Horticulture, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, Florida 32611-0675, USA.
Guy Charles L
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