• UCSBgauchos twitter avatar
    Softball: UCSB Closes Out Mary Nutter Classic With Losses to No. 8 Washington, No. 21 Arizona State https://t.co/F5JGYXZ9Ty
    6 hours 26 min ago
  • UCSBgauchos twitter avatar
    WWP: Gauchos Defeat No. 16 UCSD in Final Game of Barbara Kalbus Invitational https://t.co/ieJb9ZsJIq
    6 hours 27 min ago
  • UCSBgauchos twitter avatar
    .@UCSB_Baseball walks off in wild series finale, clinches sweep of Tulane! RECAP >>> https://t.co/Q4akiOPaVh https://t.co/6pWsFLhNmf
    8 hours 57 min ago
  • ArtsandLectures twitter avatar
    Celebrate the traditions of the gaucho with Argentina's #CheMalambo on Sunday, Apr 23 at 7PM at UCSB Campbell Hall.… https://t.co/z7Qvi0p9UV
    17 hours 18 min ago
  • ucsantabarbara twitter avatar
    #UCSB professor Luyendyk never intended ‘Zealandia’ to be a new continent's name. https://t.co/aB4RRpsEUj
    18 hours 26 min ago
  • UCSBgauchos twitter avatar
    Softball: Altmeyer Smashes Two Homers, Including Walk-Off Winner in 6-5 Win Over No. 20 Missouri https://t.co/Upedr26iud
    1 day 3 hours ago
  • UCSBgauchos twitter avatar
    Jacob Delson had 34 kills, most by UCSB MVB player since 2010, but Gauchos drop tight five-setter at UCI. RECAP >>>… https://t.co/q5KGaJXpXe
    1 day 5 hours ago
  • UCSBgauchos twitter avatar
    Women's Tennis: UC Santa Barb. 0, Washington 7 (Final) UCSB Falls to 34th-ranked Washington, 0-7 https://t.co/bERvf7q21G
    1 day 6 hours ago
  • UCSBgauchos twitter avatar
    WWP: Gauchos Split Games on Day Two of Barbara Kalbus Invitational, Face No. 16 UCSD Tomorrow https://t.co/C2cigLAaAg
    1 day 7 hours ago
  • UCSBgauchos twitter avatar
    WBB: UCSB Drops Decision At #BWCWBB Leading UC Davis 70-61 To Close Regular Season Road Campaign https://t.co/Bj1F1AtnZM
    1 day 9 hours ago
  • UCSBgauchos twitter avatar
    .@UCSB_Baseball's offense explodes, Cohen goes yard twice in 14-1 rout of Tulane! RECAP >>> https://t.co/8weh6VX0IB https://t.co/2IvFPM1wKS
    1 day 9 hours ago
  • ucsantabarbara twitter avatar
    From theory to practice, this week's #GauchoCourse prepares soon-to-be professors for the real world. https://t.co/DAj0nUIwAw
    1 day 19 hours ago
  • UCSBgauchos twitter avatar
    MVB: Gauchos snap 7 match losing streak with emphatic sweep of UCSD on Friday night. RECAP >>>… https://t.co/Cee1KbeXOh
    2 days 5 hours ago
  • UCSBgauchos twitter avatar
    Women's Tennis: UC Santa Barb. 2, Oregon 5 (Final)
    2 days 7 hours ago
  • UCSBgauchos twitter avatar
    WBB: Gauchos Face First-Place UC Davis Looking to End Two-Game Skid https://t.co/wRGTYxtxDC
    2 days 8 hours ago

Study of Flower Color Shows Evolution in Action

Monday, June 29, 2009 - 17:00
Santa Barbara, CA

imagetn.aspx_.jpg

The Rocky Mountain Columbine (A. coerulea)

Photo Credit: 

R. Kelly Dawe

imagetn.aspx_.jpg

This Longspur Columbine (A. longissima) has the longest nectar spurs in the genus.

Photo Credit: 

Scott A. Hodges

Scientists at UC Santa Barbara have zeroed in on the genes responsible for changing flower color, an area of research that began with Gregor Mendel's studies of the garden pea in the 1850's.

In an article published recently in the Proceedings of the National Academies of Sciences, two researchers document their studies of the evolution of columbine flowers in North America. They studied red columbines pollinated by hummingbirds, and white or yellow columbines pollinated by hawkmoths. They believe that a color shift from red to white or yellow has happened five times in North America.

"What is important in this research is that hawkmoths mostly visit –– and pollinate –– white or pale flowers," said senior author Scott A. Hodges, professor of ecology, evolution and marine biology at UCSB. "We have shown experimentally that hawkmoths prefer these paler colors."

When a plant population shifts from being predominantly hummingbird-pollinated where flowers are red, to hawkmoth-pollinated, natural selection works to change the flower color to white or yellow, he explained.

"Ultimately we want to know if evolution can be predictable," said Hodges. "In other words, we want to know if each time there is an evolutionary change in flower color, does it happen in the same way?

Having identified all the genes that are intimately involved with making red and blue columbines now allows us to determine how these evolutionary transitions have occurred."

In earlier research, Hodges showed that flowers evolve in a predictable fashion to match the mouthparts of pollinating birds and insects. Thus the pollinators of the yellow columbine flower, A. longissima, are predicted to have exceptionally long tongues to reach the nectar at the bottom.

Graduate student Nathan J. Derieg is the second author. This research was entirely funded by the National Science Foundation. It is part of a large multi-university study funded by the NSF through UCSB.

 

 


 

 

[RETURN TO TOP]  

 

Scott Hodges at the UCSB greenhouse holding orange and yellow Western Columbines (A. Formosa) and white columbines (A. pinetorum). The yellow flowers in the background are Golden Columbines (A. chrysantha).

Credit: George Foulsham, Public Affairs, UCSB

Scott Hodges: Current Research