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Response of Gas Exchange in Jointed Goatgrass (Aegilops cylindrica) to Environmental Conditions

Published online by Cambridge University Press:  12 June 2017

David R. Gealy
David R. Gealy*
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Washington State Univ., Pullman, WA 99164
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Abstract

Gas exchange of jointed goatgrass leaves was affected by temperature, irradiance level, and soil matric potential. Net photosynthesis of leaves under saturating irradiance (PPFD3 = 1850 (μE·m–2·s−1) was optimum at about 20 C. At 25 C, net photosynthesis was nearly 90% of maximum at a PPFD of 800 μE·m–2·−1. Transpiration, and presumably water use, increased steadily with temperature from 10 to 40 C. Dark respiration rate and compensation points for light and for CO2 increased exponentially, or nearly so, from 10 to 40 C. Soil moisture deficits of −130 kPa reduced net photosynthesis and transpiration by about 30 and 55%, respectively, compared to well-watered plants.

Keywords

Jointed goatgrassAegilops cylindrica Host. ♯4 AEGCYMoisture deficitleaf temperatureirradiancephotosynthesisdark respirationdiffusive resistancetranspirationcompensation pointAEGCY
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 37 , Issue 4 , July 1989 , pp. 562 - 569
Copyright
Copyright © 1989 by the Weed Science Society of America 

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