Evolution of Genome Size in Duckweeds (Lemnaceae)

[摘要] To extensively estimate the DNA content and to provide a basic reference for duckweed genome sequence research, the nuclear DNA content for 115 different accessions of 23 duckweed species was measured by flow cytometry (FCM) stained with propidium iodide as DNA stain. The 1C-value of DNA content in duckweed family varied nearly thirteen-fold, ranging from 150 megabases (Mbp) inSpirodela polyrhizato 1,881 Mbp inWolffia arrhiza. There is a continuous increase of DNA content inSpirodela, Landoltia, Lemna, Wolffiella, andWolffiathat parallels a morphological reduction in size. There is a significant intraspecific variation in the genusLemna. However, no such variation was found in other studied species with multiple accessions of generaSpirodela, Landoltia, Wolffiella,andWolffia.

[学科分类] 植物学