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Gas Exchange Properties of Jointed Goatgrass (Aegilops cylindrica)

Published online by Cambridge University Press:  12 June 2017

David R. Gealy
David R. Gealy*
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., 215 Johnson Hall, Washington State Univ., Pullman, WA 99164
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Abstract

Net (apparent) photosynthesis rate (Pn) of jointed goatgrass (Aegilops cylindrica Host # AEGCY) leaves in the greenhouse became light saturated at a photosynthetic photon flux density (PPFD) of about 1000 μE·m–1-2·s–1 with a maximum Pn of 27 mg CO2 ·dm–2 ·h–1. Diffusive resistance to water vapor (rl) of adaxial leaf surfaces was 43% that of abaxial surfaces, in part, because stomatal density was 50% greater on adaxial leaf surfaces than on abaxial surfaces. Dark respiration rate (Rd) was 1.6 mg CO2 ·dm−2·h−1. Light compensation point (CPl) was 21 μE·m−2·s−1 and CO2 compensation point (CPc) was 32 ppmv. In the field, where light intensity and temperature were greater than in the greenhouse, leaves became light saturated for Pn at a higher intensity, and Rd and CPl were three times greater than in the greenhouse. Pn and Rd of spikes at anthesis were at least 30% less and 200% greater, respectively, than the values for leaves.

Keywords

Stomatacompensation pointrespirationphotosynthesisgas analysisstomatal frequencymoisture stressdiffusive resistanceAEGCY
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 35 , Issue 4 , July 1987 , pp. 482 - 489
Copyright
Copyright © 1987 by the Weed Science Society of America 

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