The Delicate Water Lily: A Rose by Another Name?

Genome Duplication Event May Have Contributed to Floral Scent Biosynthesis and Other Traits of Early-diverged Flowering Plants

Water lily in UT Gardens, Knoxville by G. Clemons web

KNOXVILLE, Tenn. — A new study published in Nature reports the 409-megabase genome sequence of the blue-petal water lily (Nymphaea colorata). The conclusion of the 47 coauthors is that although a rose is a rose, most flowering plants may owe their success, including employing floral scent for attracting pollinators, in part to the genetic innovations observed in the delicate water lily.

Known the world over, water lilies are beloved features in ponds and a frequent subject in art from paintings to sculptures. Some religions consider them symbolic of life.

Those beliefs may not be too far from the mark. The study’s authors analyzed the genes of Nymphaeales, the order of flowering water plants that includes water lilies, and their results point to Nymphaeales as one of two sister lineages to all other flowering plants, possibly due to a whole genome duplication event some 147–185 million years ago. The other lineage is Amborellales, an order of flowering shrubs that includes only one species, Amborella trichopoda.

Flowering plants, also known as angiosperms, are the most diverse group of land plants, with 64 orders, 416 families, approximately 13,000 known genera and 300,000 known species. The international coalition of researchers that collaborated on the study includes Feng Chen, a professor of plant sciences in the University of Tennessee Institute of Agriculture, his colleague Xinlu Chen and doctoral student Chi Zhang from the same department, and doctoral student Qidong Jia of the Genome Science and Technology Graduate program at UT. Feng Chen is an adjunct member of the faculty for that program. Coauthors also include another scientist named Chen—Fei Chen—who is from Nanjing Agricultural University (NAU), China, to which UTIA’s Chen is also an adjunct faculty through the Center of Agricultural Plant Biology established by UT and NAU in 2017. “This paper demonstrates the importance of multidisciplinary collaborations”, says UTIA’s Chen. He is among the six supervising collaborators for the entire project.

The UT group contributed to the analysis of the genetic basis of floral scent biosynthesis in water lilies. “Floral scent for attracting pollinators is critical for both the diversity of plants and plant-based agricultural production,” says Chen. According to the USDA Natural Resource Conservation Service, three-fourths of the world’s flowering plants and about 35 percent of the world’s food crops depend on animal pollinators, including insects, to reproduce. Many of those pollinators rely on floral scent to help them locate a plant’s flowers. “The flowers of A. trichopoda are scentless”, according to Chen, who was a coauthor of a Science article reporting the genome of A. trichopoda in 2013. “It is therefore intriguing to understand when and how flowering plants evolved scent,” he says.

The study explains that among the genes retained from the Nymphaeales’ whole-genome duplication event are homologues of genes that regulate flowering transition and flower development in all flowering plants. Specifically, the UTIA group studied N. colorata.

“Water lilies have evolved attractive floral scents and colors, which are features shared with core angiosperms,” said Chen. “The chemical compounds and biosynthetic genes we analyzed—those that produce the floral scents—suggest that the scents of water lilies have evolved in parallel to those in core angiosperms. Because of its unique phylogenetic position, the innovations in scent biosynthesis and other traits revealed from the N. colorata genome shed light on the early evolution of all angiosperms.”

The paper, “The water lily genome and the early evolution of flowering plants,” was published online December 18 in Nature, and will be featured in the January 2, 2020 print issue.

Through its land-grant mission of research, teaching and extension, the University of Tennessee Institute of Agriculture touches lives and provides Real. Life. Solutions.

About Brad Jones

Brad is the Owner/Operator of BBB TV 12, and has been with the company since August of 1996. Brad is a 1987 graduate of Coalfield High School and a 1995 graduate of the University of Tennessee College of Communications. He won the 1995 broadcast production student of the year award. Brad worked at Shop at Home, Inc. a home shopping network that was located in Knoxville, TN from 1993 - 1995 and then at Via TV (RSTV, Inc.) from 1995 - 1996. After some freelance work in Nashville, Brad joined the BBB Communications staff in August of 1996. A short stint at WVLT TV as a news photographer was in 2001, but he continued to work at BBB TV as well. Brad is married to Nicole Jenkins Jones, a 1990 graduate of Oak Ridge High School, who works at Oak Ridge Gastroenterology and Associates in Oak Ridge. They have 3 kids, Trevor Bogard, 27, Chandler 22, and Naomi 13. On December 12, 2013 they welcomed their first grandchild, Carter Ryan Bogard. Brad is also the assistant boys basketball coach at Coalfield High School for the past 11 years. In 2013-14 the Yellow Jackets won their first district title since 1991 and just the 4th in school history.

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