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Record Details

Record 79 of 7773
Adaptation to high CO2 concentration in an optimal environment: radiation capture, canopy quantum yield and carbon use efficiency
External Online Source: doi:10.1046/j.1365-3040.1998.00284.x
Author and Affiliation:
Monje, O.(Utah State University, Department of Plants, Soils and Biometeorology, Logan 84322-4820, United States)
Bugbee, B.
Abstract: The effect of elevated [CO2] on wheat (Triticum aestivum L. Veery 10) productivity was examined by analysing radiation capture, canopy quantum yield, canopy carbon use efficiency, harvest index and daily C gain. Canopies were grown at either 330 or 1200 micromoles mol-1 [CO2] in controlled environments, where root and shoot C fluxes were monitored continuously from emergence to harvest. A rapidly circulating hydroponic solution supplied nutrients, water and root zone oxygen. At harvest, dry mass predicted from gas exchange data was 102.8 +/- 4.7% of the observed dry mass in six trials. Neither radiation capture efficiency nor carbon use efficiency were affected by elevated [CO2], but yield increased by 13% due to a sustained increase in canopy quantum yield. CO2 enrichment increased root mass, tiller number and seed mass. Harvest index and chlorophyll concentration were unchanged, but CO2 enrichment increased average life cycle net photosynthesis (13%, P < 0.05) and root respiration (24%, P < 0.05). These data indicate that plant communities adapt to CO2 enrichment through changes in C allocation. Elevated [CO2] increases sink strength in optimal environments, resulting in sustained increases in photosynthetic capacity, canopy quantum yield and daily C gain throughout the life cycle.
Publication Date: Jan 01, 1998
Document ID:
20040088900
(Acquired Sep 07, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Plant, cell & environment (ISSN 0140-7791); Volume 21; 315-24
Publisher Information: United Kingdom
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ADAPTATION; BIOMASS; CARBON; CARBON DIOXIDE; CARBON DIOXIDE CONCENTRATION; HYPERCAPNIA; LIGHT (VISIBLE RADIATION); METABOLISM; PHOTOSYNTHESIS; WHEAT; CELLS (BIOLOGY); CHLOROPHYLLS; ENVIRONMENTAL CONTROL; LIFE SUPPORT SYSTEMS; NITROGEN; PLANT ROOTS; RESPIRATION; SEEDS; TIME DEPENDENCE
Other Descriptors: BIOMASS; CARBON DIOXIDE/PHARMACOKINETICS; LIGHT; PHOTOSYNTHESIS/PHYSIOLOGY/RADIATION EFFECTS; TRITICUM/GROWTH & DEVELOPMENT/METABOLISM/RADIATION EFFECTS; ADAPTATION, PHYSIOLOGICAL; CARBON/METABOLISM; CELL RESPIRATION; CHLOROPHYLL/METABOLISM; COMPARATIVE STUDY; ENVIRONMENT, CONTROLLED; NITROGEN/METABOLISM; PLANT ROOTS/GROWTH & DEVELOPMENT/METABOLISM/RADIATION EFFECTS; SEEDS/DRUG EFFECTS; SUPPORT, U.S. GOV'T, NON-P.H.S; TIME FACTORS; NASA DISCIPLINE LIFE SUPPORT SYSTEMS; NON-NASA CENTER
Availability Source: Other Sources
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