Upcoming Seminars
Past Seminars
2019
2018
10-10-2018
Priyanga Amarasekare
10-03-2018
Blaire Van Valkenburgh
05-23-2018
Julianne Passarelli
02-15-2018
EcoEvoPub Lightning Talks
02-13-2018
Alejandra Rodriguez Verdugo
2017
05-31-2017
Cancelled- To Be Rescheduled
04-20-2017
Shane Campbell-Staton
03-08-2017
Elizabeth Hadly: CANCELLED
2016
11-30-2016
G. Darrel Jenerette
11-02-2016
Carlos Ruiz R-Miranda
10-19-2016
Elizabeth Heath-Heckman
10-12-2016
Sriram Sankararaman
2015
05-13-2015
Christina (Tina) Swanson
02-25-2015
Emilia Huerta-Sanchez
2014
12-10-2014
Wayne Getz [CANCELED]
05-14-2014
CANCELLED David Ackerly
05-14-2014
17th Annual Biology
02-12-2014
Jeannine Cavender-Bares
2013
11-13-2013
Barbara Natterson-Horowitz
10-02-2013
Priyanga Amarasekare
05-15-2013
Biology Research Symposium
02-14-2013
--CANCELLED--EcoEvoPub Series
2012
12-05-2012
Blaire Van Valkenburgh-CANCELLED
04-24-2012
Christofer Clemente
04-24-2012
William F. Laurance
04-11-2012
Gloria DeGrandi-Hoffman
2011
12-07-2011
CANCELLED Jules Jaffe
05-11-2011
Biology Research Symposium: Michael A. Bell
04-19-2011
Ecolunch: Jochen Schenk
04-14-2011
Darwin Evolving Series: Amy Parish
04-12-2011
Ecolunch: John Sperry
03-08-2011
Ecolunch: Oscar Godoy Del Olmo
03-01-2011
Ecolunch: Brant Faircloth
02-15-2011
Ecolunch: Julien Martin
02-11-2011
Lawrence (Larry) W. Harding
02-03-2011
Margaret Jean McFall-Ngai
02-01-2011
Ecolunch: Francesco Santini
01-25-2011
Ecolunch: Tom Huggins
2010
11-23-2010
EcoLunch: J. Pablo Arroyo
11-16-2010
EcoLunch: Richard Norris
11-09-2010
Ecolunch: Soren Faurby
11-02-2010
Ecolunch: Brendan Choat
10-26-2010
Ecolunch: Raquel Monclus
10-12-2010
Ecolunch: Willem Frankenhuis
Karthik Panchanathan
09-28-2010
Ecolunch: Liza Comita
09-14-2010
Ecolunch: Adam Siegel
06-30-2010
Dr. Eva Ursprung and Dr. Max Ringler
06-01-2010
Ecolunch: Daniela Cusack
05-26-2010
Michael J. Sanderson
05-18-2010
Mel (Mary Ellen) Harte
03-30-2010
Ecolunch: Malin Ah-King
03-16-2010
Ecolunch: Adam Freedman
03-09-2010
Ecolunch: Kazutoshi Sasahara
03-02-2010
Ecolunch: Nathalie Seddon
02-16-2010
Ecolunch: Alvaro Sagasti
01-19-2010
EcoLunch: Maud Ferrari
2009
12-08-2009
Ecolunch: Michael Parsons
12-07-2009
Dr. Satoshi Mitarai
12-01-2009
Ecolunch: Ryan Harrigan
11-17-2009
Ecolunch: Graham Slater
10-20-2009
Ecolunch: Peter Narins
10-07-2009
Blaire Van Valkenburgh
10-06-2009
Ecolunch: Lauri Green
09-29-2009
Ecolunch: Catalina Estrada
Seminars
April 19 2011
12:00 BSRB 154
Ecolunch: Jochen Schenk
A Hard Day's Night: Nocturnal Removal of Air from Plant Hydraulic Systems
Summary
Two enduring mysteries of plant physiology are the function of nighttime transpiration and the nature of the mechanism that allows removal of air bubbles (embolisms) from a plant’s hydraulic system while the system is functioning under negative pressure. Nighttime transpiration is particularly common in plants from dry environments, which would appear to be least able to afford wasteful water loss. Refilling of air-filled conduits while the remaining hydraulic system is under negative pressure has been thought to be physically impossible, yet is commonly observed. In our lab, 10 out of 20 shrub species studied at field sites across the North American continent showed embolism repair under tension. All of these 10 species were from dry environments, and embolism repair occurred while stomata were at least partially open. Using the North American desert shrub Encelia farinosa (Asteraceae) as a focal study species, we found that experimental inhibition of nighttime transpiration by bagging of leaves inhibited embolism repair. Measurements of air flow into artificially created embolisms in the wood revealed that air from these embolisms dissolved into the transpiration stream of functioning conduits. Nighttime transpiration appears to be required to move air-saturated sap towards the leaves before temperatures increase again during the next morning, which would cause gas solubility to decrease and air to come out of solution. Nighttime transpiration, an important flux in the water balance of many ecosystems, is explained at least in part as playing a vital role in the nocturnal recovery from drought-stress experienced during the day.
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