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The balance of malate synthesis and metabolism in response to ion uptake in excised wheat roots

Barry Osmond, C. ; Popp, Marianne

Plant Science Letters, 1983, Vol.32(1), pp.115-123

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  • Título:
    The balance of malate synthesis and metabolism in response to ion uptake in excised wheat roots
  • Autor: Barry Osmond, C. ; Popp, Marianne
  • Assuntos: Malate Synthesis ; Malate Decarboxylation ; Ion Uptake ; Excised Wheat Roots ; PEP
  • É parte de: Plant Science Letters, 1983, Vol.32(1), pp.115-123
  • Descrição: Malic acid in wheat roots was labeled by incubation in KH 14 CO 3 for 1 h and then transferred to unlabeled salt solutions. The amount of 14 CO 2 released from labeled roots was greatest in CaCl 2 solutions, which resulted in the largest net decrease in malic acid concentration and least in KHCO 3 in which malic acid continued to accumulate. Similar results were obtained from short-term (10 min) labeling when KH 14 CO 3 was added to roots in different salt solutions and the subsequent release of 14 CO 2 was monitored. Calculations suggest that the regulation of malic acid uptake to the vacuole in response to ionic balance determines whether or not newly synthesized malic acid is decarboxylated. Decarboxylation, rather than reduction of synthesis, was the principal means of regulating malic acid concentration. However, in CaCl 2 solutions inhibition of synthesis also contributed to the net reduction in malic acid concentrations.
  • Idioma: Inglês

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