The Kalanchoë genome provides insights into convergent evolution and building blocks of crassulacean acid metabolism

Xiaohan Yang, Rongbin Hu, Hengfu Yin, Jerry Jenkins, Shengqiang Shu, Haibao Tang, Degao Liu, Deborah A. Weighill, Won Cheol Yim, Jungmin Ha, Karolina Heyduk, David M. Goodstein, Hao Bo Guo, Robert C. Moseley, Elisabeth Fitzek, Sara Jawdy, Zhihao Zhang, Meng Xie, James Hartwell, Jane GrimwoodPaul E. Abraham, Ritesh Mewalal, Juan D. Beltrán, Susanna F. Boxall, Louisa V. Dever, Kaitlin J. Palla, Rebecca Albion, Travis Garcia, Jesse A. Mayer, Sung Don Lim, Ching Man Wai, Paul Peluso, Robert Van Buren, Henrique Cestari De Paoli, Anne M. Borland, Hong Guo, Jin Gui Chen, Wellington Muchero, Yanbin Yin, Daniel A. Jacobson, Timothy J. Tschaplinski, Robert L. Hettich, Ray Ming, Klaus Winter, James H. Leebens-Mack, J. Andrew C. Smith, John C. Cushman, Jeremy Schmutz, Gerald A. Tuskan

Research output: Contribution to journalArticlepeer-review

Abstract

Crassulacean acid metabolism (CAM) is a water-use efficient adaptation of photosynthesis that has evolved independently many times in diverse lineages of flowering plants. We hypothesize that convergent evolution of protein sequence and temporal gene expression underpins the independent emergences of CAM from C3 photosynthesis. To test this hypothesis, we generate a de novo genome assembly and genome-wide transcript expression data for Kalanchoë fedtschenkoi, an obligate CAM species within the core eudicots with a relatively small genome (~260 Mb). Our comparative analyses identify signatures of convergence in protein sequence and re-scheduling of diel transcript expression of genes involved in nocturnal CO2 fixation, stomatal movement, heat tolerance, circadian clock, and carbohydrate metabolism in K. fedtschenkoi and other CAM species in comparison with non-CAM species. These findings provide new insights into molecular convergence and building blocks of CAM and will facilitate CAM-into-C3 photosynthesis engineering to enhance water-use efficiency in crops.

Original languageEnglish (US)
Article number1899
JournalNature communications
Volume8
Issue number1
DOIs
StatePublished - Dec 1 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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