Effect of High Temperature on Plant Growth and Carbohydrate Metabolism in Potato
Abbas M. Lafta,James H. Lorenzen +1 more
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TLDR
There was no interaction of temperature and genotype with regard to the enzymes examined; therefore, observed differences do not account for differences between genotypes in heat susceptibility.Abstract:
This study was undertaken to determine the role of sucrose-metabolizing enzymes in altered carbohydrate partitioning caused by heat stress. Potato (Solanum tuberosum L.) genotypes characterized as susceptible and tolerant to heat stress were grown at 19/17[deg]C, and a subset was transferred to 31/29[deg]C. Data were obtained for plant growth and photosynthesis. Enzyme activity was determined for sucrose-6-phosphate synthase (SPS) in mature leaves and for sucrose synthase, ADP-glucose pyrophosphorylase, and UDP-glucose pyrophosphorylase in developing tubers of plants. High temperatures reduced growth of tubers more than of shoots. Photosynthetic rates were unaffected or increased slightly at the higher temperature. Heat stress increased accumulation of foliar sucrose and decreased starch accumulation in mature leaves but did not affect glucose. SPS activity increased significantly in mature leaves of plants subjected to high temperature. Changes in SPS activity were probably not due to altered enzyme kinetics. The activity of sucrose synthase and ADP-glucose pyrophosphorylase was reduced in tubers, albeit less quickly than leaf SPS activity. There was no interaction of temperature and genotype with regard to the enzymes examined; therefore, observed differences do not account for differences between genotypes in heat susceptibility.read more
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References
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Regulation of the Amount of Starch in Plant Tissues by ADP Glucose Pyrophosphorylase
TL;DR: Plant and bacterial systems for starch and glycogen biosynthesis are similar and distinct from yeast and mammalian systems, wherein glycogen synthase has been demonstrated to be the rate-limiting regulatory step.
Journal ArticleDOI
Direct microdetermination of sucrose
TL;DR: In this article, a method for direct determination of sucrose is described, which depends on the destruction of reducing sugars with hot alkali, followed by determination of the fructose moiety of the sucrose, using cold anthrone.
Journal ArticleDOI
Sucrose Phosphate Synthase and Sucrose Accumulation at Low Temperature
TL;DR: The influence of growth temperature on the free sugar and sucrose phosphate synthase content and activity of spinach leaf tissue was studied and increases in sucrose and its primary biosynthetic enzyme, sucrose phosphorus synthase, are discussed in relation to adjustment of metabolism to low nonfreezing temperature and freezing stress tolerance.
Journal ArticleDOI
Regulation of the Biosynthesis and Degradation of Starch
TL;DR: In vivo Evidence Strongly Suggesting that the [3-P-glycerate]l[P,] Regulates Leaf Starch Synthesis is suggested.
Sucrose Phosphate Synthase andSucrose Accumulation at LowTemperature
Charles L. Guy,A. Huber,C. Huber +2 more
TL;DR: The influence of growth temperature on the free sugar and sucrose phosphate synthase content and activity of Spinacia oleracea leaf tissue was studied in this paper, where the authors found that the sucrose was the most abundant free sugar before, during, and after exposure to 5°C.