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Regulation of loblolly pine (Pinus taeda L.) arginase in developing seedling tissue during germination and post-germinative growth

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Abstract

After seed germination, hydrolysis of storage proteins provides a nitrogen source for the developing seedling. In conifers the majority of these reserves are located in the living haploid megagametophyte tissue. In the developing loblolly pine (Pinus taeda L.) seedling an influx of free amino acids from the megagametophyte accompanies germination and early seedling growth. The major component of this amino acid pool is arginine, which is transported rapidly and efficiently to the seedling without prior conversion. This arginine accounts for nearly half of the total nitrogen entering the cotyledons and is likely a defining factor in early seedling nitrogen metabolism. In the seedling, the enzyme arginase is responsible for liberating nitrogen, in the form of ornithine and urea, from free arginine supplied by the megagametophyte. In this report we investigate how the seedling uses arginase to cope with the large arginine influx. As part of this work we have cloned an arginase cDNA from a loblolly pine expression library. Analysis of enzyme activity data, accumulation of arginase protein and mRNA abundance indicates that increased arginase activity after seed germination is due to de novo synthesis of the enzyme. Our results suggest that arginase is primarily regulated at the RNA level during loblolly pine seed germination and post-germinative growth.

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Authors and Affiliations

  1. Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada

    Christopher D. Todd & David J. Gifford

  2. Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL

    Janice E.K. Cooke

  3. Department of Botany, University of Guelph, Guelph, Ontario, Canada

    Robert T. Mullen

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  1. Christopher D. Todd
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  2. Janice E.K. Cooke
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  3. Robert T. Mullen
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  4. David J. Gifford
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Todd, C.D., Cooke, J.E., Mullen, R.T. et al. Regulation of loblolly pine (Pinus taeda L.) arginase in developing seedling tissue during germination and post-germinative growth. Plant Mol Biol 45, 555–565 (2001). https://doi.org/10.1023/A:1010645616920

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