Abstract
Duckweed is an interesting model for studying cytogenetics, epigenetics and karyotype evolution. Belonging to the monocotyledonous arum or aroid family Araceae, these aquatic plants present an approximately 12-fold range of different genome sizes, from 158 Mbp (Spirodela sps.) to 1881 Mbp (Wolffia arrhiza) and variable chromosome numbers. In addition to reduced gene repertoires that found in so far all published duckweed genomes of Spirodela, Lemna and Wolffia species, several peculiar genome and epigenome features (e.g. the lowest copy number of genes coding for rRNA, extreme levels of global DNA methylation, and atypical patterns of heterochromatic and euchromatic territories) indicate a unique and interesting history of duckweed genome evolution, organization and adaptation to plants with simplified body architecture and extremely fast growth rate. Together with the high-throughput long-read, long-range information and optical mapping technologies, available cytogenetic resources, including an efficient and robust protocol of multicolour fluorescence in situ hybridization (mcFISH) and mitotic chromosome preparation, and a Spirodela genome-integrated bacterial-artificial-chromosome (BAC) map with ancestral chromosome linkages allow further comprehensive comparative genomic and cytogenetic analysis between duckweed, its close relatives, and other monocotyledonous plants of interest.
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We thank Charlotte Ost (University of Halle-Wittenberg) for reading the article and for critical discussions.
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Cao, X.H., Vu, G.T.H. (2020). Cytogenetics, Epigenetics and Karyotype Evolution of Duckweeds. In: Cao, X., Fourounjian, P., Wang, W. (eds) The Duckweed Genomes. Compendium of Plant Genomes. Springer, Cham. https://doi.org/10.1007/978-3-030-11045-1_4
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