9. Genomics and Transcriptomics of Photosynthesis in Polyploids

  1. Z. Jeffrey Chen2 and
  2. James A. Birchler3
  1. Jeremy E. Coate and
  2. Jeff J. Doyle

Published Online: 4 APR 2013

DOI: 10.1002/9781118552872.ch9

Polyploid and Hybrid Genomics

Polyploid and Hybrid Genomics

How to Cite

Coate, J. E. and Doyle, J. J. (2013) Genomics and Transcriptomics of Photosynthesis in Polyploids, in Polyploid and Hybrid Genomics (eds Z. J. Chen and J. A. Birchler), John Wiley & Sons, Inc., Oxford, UK. doi: 10.1002/9781118552872.ch9

Editor Information

  1. 2

    The University of Texas at Austin, Austin, Texas

  2. 3

    University of Missouri, Columbia, Missouri

Author Information

  1. Department of Plant Biology, Cornell University, Ithaca, New York, USA

Publication History

  1. Published Online: 4 APR 2013
  2. Published Print: 14 MAY 2013

ISBN Information

Print ISBN: 9780470960370

Online ISBN: 9781118552872

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Keywords:

  • Photosynthesis;
  • gene dosage;
  • transcriptome size;
  • genome dominance;
  • homoeologue expression

Summary

Polyploidy has immediate and lasting effects on photosynthesis. In order to elucidate how polyploidy impacts photosynthesis, we have investigated the evolutionary trajectories of photosynthetic gene networks in three ancient polyploids, as well as the transcriptional responses of photosynthetic genes in a recently formed allotetraploid exhibiting enhanced photosynthetic capacity. We have shown that patterns of duplicate gene retention differ among the major photosynthetic gene networks, consistent with the photosystems being under selection to preserve relative dosage balance, and the Calvin cycle being under selection to increase absolute dosage. Expression patterns in the recently formed allopolyploid provide further support for these conclusions, and suggest that the observed increase in photosynthetic capacity is a result of higher Calvin cycle gene expression resulting from increased gene dosage. Photoprotective capacity is also enhanced in the allotetraploid, and we discuss how selective constraints on photosystem gene family evolution and expression provide clues about the molecular mechanisms of this phenotype as well.