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- W2156822842 endingPage "469" @default.
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- W2156822842 abstract "Mutants of the NAD-ME plant have been created using sodium azide. These contain reduced activities of PEP carboxylase ranging from 5 to 100% of wild-type. Those with greater than 50% of the wild-type PEPC content showed a lower maximum rate of photosynthesis and reduced carboxylation efficiency compared to the wild-type plants. The PEPC from these heterozygotes was less sensitive to malate inhibition than the PEPC of the wild-type plants and also had an increased phosphorylation state. Mutants containing 45 and 49% of wild-type PEPC exhibited a greater Amax than was observed for the 55, 66 and 70% mutants. We postulate that there is a compensatory mechanism that activates PEPC when the PEPC protein is less than 55% of the wild-type. Control coefficients were measured for PEP carboxylase from wild-type and heterozygous (55%) plants. Results suggest that activation of PEPC by phosphorylation and metabolites may be more an ‘on-off’ switch than a means of fine adjustment of PEPC activity in response to varying factors such as PEPC content, CO2 or temperature changes." @default.
- W2156822842 created "2016-06-24" @default.
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- W2156822842 date "1997-01-01" @default.
- W2156822842 modified "2023-10-01" @default.
- W2156822842 title "Control of Photosynthesis in Amaranthus edulis Mutants with Reduced Amounts of PEP Carboxylase" @default.
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- W2156822842 doi "https://doi.org/10.1071/pp97008" @default.
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