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Photosynthetic Response of Flooded Rice (Oryza sativa) and Three Echinochloa Species to Changes in Environmental Factors

Published online by Cambridge University Press:  12 June 2017

Mohamed Bouhache  and
David E. Bayer
Mohamed Bouhache
Affiliation:
Dep. Bot., Univ. California, Davis, CA 95616
David E. Bayer
Affiliation:
Dep. Bot., Univ. California, Davis, CA 95616
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Abstract

The photosynthetic responses of rice (C3) and three Echinochloa species (C4), barnyardgrass, early watergrass, and late watergrass, to changes in CO2 intercellular partial pressure, light intensity, and leaf temperature were investigated under laboratory conditions. The three Echinochloa species exhibited photosynthetic responses characteristic of C4 plants. The three weedy species showed higher efficiency for CO2 utilization at low CO2 intercellular partial pressure (CO2i) than rice. Compensation and saturation of CO2i for photosynthesis were lower in the weedy species than in rice. The maximum photosynthetic rates at high light intensity were 33.5, 32.7, 30.5, and 21.5 μmol CO2 m-2s-1 for barnyardgrass, early watergrass, late watergrass, and rice, respectively. Photosynthesis temperature optimum was 35 to 37 C for the three Echinochloa species and 33 C for rice. Overall, under simulated summer conditions, the four taxa showed a photosynthetic ability hierarchy with regard to gas exchange performance as follows: barnyardgrass ≥ early watergrass > late watergrass > rice.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGearly watergrass, E. oryzoides (Ard.) Fritsch # ECHORand late watergrass, E. phyllopogon (Stapf) Koss. # ECHPHrice, Oryza sativa ‘M.9’Water-seededcompetitive abilitylightCO2temperature
Type
Weed Biology and Ecology
Information
Weed Science , Volume 41 , Issue 4 , December 1993 , pp. 611 - 614
Copyright
Copyright © 1994 by the Weed Science Society of America 

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