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Phosphorylation of Serine-15 of Maize Leaf Sucrose Synthase (Occurrence in Vivo and Possible Regulatory Significance)
Experiments were conducted to determine whether sucrose synthase (SuSy) was phosphorylated in the elongation zone of maize (Zea mays L.) leaves. The approximately 90-kD subunit of SuSy wasExpand
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Biochemical Mechanism for Regulation of Sucrose Accumulation in Leaves during Photosynthesis.
  • S. Huber
  • Biology, Medicine
  • Plant physiology
  • 1 October 1989
It is not known why some species accumulate high concentrations of sucrose in leaves during photosynthesis while others do not. To determine the possible basis, we have studied 10 species, known toExpand
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Biochemical basis for effects of k-deficiency on assimilate export rate and accumulation of soluble sugars in soybean leaves.
  • S. Huber
  • Chemistry, Medicine
  • Plant physiology
  • 1 October 1984
The effects of K-deficiency on carbon exchange rates (CER), photosynthate partitioning, export rate, and activities of key enzymes involved in sucrose metabolism were studied in soybean (Glycine maxExpand
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Role of sucrose-phosphate synthase in sucrose metabolism in leaves.
Sucrose is formed in the cytoplasm of leaf cells from triose phosphates exported from the chloroplast. Flux control is shared among key enzymes of the pathway, one of which is sucrose-phosphateExpand
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Role of sucrose-phosphate synthase in partitioning of carbon in leaves.
  • S. Huber
  • Chemistry, Medicine
  • Plant physiology
  • 1 April 1983
Variations in leaf starch accumulation were observed among four species (wheat [Triticum aestivum L.], soybean [Glycine max L. Merr.], tobacco [Nicotiana tabacum L.], and red beet [Beta vulgarisExpand
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Biochemical Basis for Partitioning of Photosynthetically Fixed Carbon between Starch and Sucrose in Soybean (Glycine max Merr.) Leaves.
The control of photosynthetic starch/sucrose formation in leaves of soybean (Glycine max L. Merr.) cultivars was studied in relation to stage of plant development, photosynthetic photoperiod, andExpand
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Comparative studies of the light modulation of nitrate reductase and sucrose-phosphate synthase activities in spinach leaves.
We recently obtained evidence that the activity of spinach (Spinacia oleracea L.) leaf nitrate reductase (NR) responds rapidly and reversibly to light/dark transitions by a mechanism that is stronglyExpand
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Activation of sucrose-phosphate synthase from darkened spinach leaves by an endogenous protein phosphatase.
  • S. Huber, J. Huber
  • Chemistry, Medicine
  • Archives of biochemistry and biophysics
  • 1 November 1990
Sucrose-phosphate synthase (SPS; EC 2.4.1.14) extracted from darkened spinach (Spinacia oleracea L.) leaves has a low activation state, defined as the ratio of activity measured with limitingExpand
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Effects of Water Stress on Photosynthesis and Carbon Partitioning in Soybean (Glycine max [L.] Merr.) Plants Grown in the Field at Different CO(2) Levels.
The effects of water stress and CO(2) enrichment on photosynthesis, assimilate export, and sucrose-P synthase activity were examined in field grown soybean plants. In general, leaves of plants grownExpand
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In vitro phosphorylation and inactivation of spinach leaf sucrose-phosphate synthase by an endogenous protein kinase.
  • S. Huber, J. Huber
  • Biology, Medicine
  • Biochimica et biophysica acta
  • 19 February 1991
(1) Partially purified preparations of spinach (Spinacia oleracea L.) leaf sucrose-phosphate synthase (SPS) contain an endogenous protein kinase that phosphorylates and inactivates the enzyme withExpand
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