Water stress decreases the transfer conductance of Douglas-fir (Pseudotsuga menziesii) seedlings

Tree Physiology
C R WarrenD H Turpin

Abstract

We tested the hypothesis that transfer conductance (gi) of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings is reduced by water stress. Seedlings were irrigated with a solution of 25% polyethylene glycol so as to impose water stress rapidly, thereby limiting acclimatory responses. Transfer conductance was measured pre-treatment and post-treatment by two methods. Water stress reduced net photosynthesis by 20-50%. The initial slope of the rate of photosynthesis (A) over the intercellular carbon dioxide (CO2) concentration (Ci) response was reduced by water stress, indicating that reduced photosynthesis was not wholly accounted for by reduced stomatal conductance. The carbon isotope and chlorophyll fluorescence methods both indicated that water stress decreased gi. From isotopic measurements with 1% O2, gi was 0.076 +/- 0.009 (mean +/- SE) mol m(-2) s(-1) in well-watered seedlings and 0.044 +/- 0.004 mol m(-2) s(-1) in water-stressed seedlings. Fluorescence estimates of gi were 0.08 +/- 0.01 mol m(-2) s(-1) in well-watered seedlings and 0.044 +/- 0.004 mol m(-2) s(-1) in water-stressed seedlings. The drought-induced reduction in gi was responsible for the reduction in slope of the A/Ci response, and thus there was no d...Continue Reading

Citations

Apr 28, 2009·Journal of Experimental Botany·Ulo NiinemetsCharles R Warren
May 27, 2010·Journal of Experimental Botany·Christopher P BickfordNate G McDowell
Apr 23, 2011·Journal of Experimental Botany·Marta S LopesChristine H Foyer
Nov 13, 2007·Plant, Cell & Environment·Jaume FlexasHipólito Medrano
Aug 11, 2010·The New Phytologist·Jill T AndersonMonica A Geber
Jun 23, 2011·Plant, Cell & Environment·Charles R WarrenF Javier Cano
Nov 18, 2008·Annals of Botany·Nelson J M SaiboMaria Margarida Oliveira
Mar 21, 2017·The New Phytologist·Graham D Farquhar, Florian A Busch
May 23, 2008·Physiologia Plantarum·Philippus Daniel Riekert van Heerden, Robert Laurie
Oct 2, 2019·The Plant Journal : for Cell and Molecular Biology·Rangjian Qiu, Gabriel G Katul
May 1, 2006·Functional Plant Biology : FPB·Charles Warren
May 1, 2021·Journal of Experimental Botany·David IsraelT Matthew Robson

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