The Kalanchoe genome provides insights into convergent evolution and building blocks of crassulacean acid metabolism
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Authors
Yang, Xiaohan
Hu, Rongbin
Yin, Hengfu
Jenkins, Jerry
Shu, Shengqiang
Tang, Haibao
Liu, Degao
Weighill, Deborah A..
Yim, Won C.
Ha, Jungmin
Issue Date
2017
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Article
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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 C-3 photosynthesis. To test this hypothesis, we generate a de novo genome assembly and genome-wide transcript expression data for Kalanchoe fedtschenkoi, an obligate CAM species within the core eudicots with a relatively small genome (similar to 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-C-3 photosynthesis engineering to enhance wateruse efficiency in crops.
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Citation
Yang, X., Hu, R., Yin, H., Jenkins, J., Shu, S., Tang, H., … Tuskan, G. A. (2017). The Kalanchoë genome provides insights into convergent evolution and building blocks of crassulacean acid metabolism. Nature Communications, 8(1). doi:10.1038/s41467-017-01491-7
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Creative Commons Attribution 4.0 International
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ISSN
2041-1723