skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Impact of global climate change on ecosystem-level interactions among sympatric plants from all three photosynthetic pathways. Terminal report

Abstract

The proposed research will determine biochemical and physiological responses to variations in environmental factors for plants of all three photosynthetic pathways under competitive situations in the field. These responses will be used to predict the effects of global climatic change on an ecosystem in the northwestern Sonoran Desert where the C{sub 3} subshrub Encelia farinosa, the C{sub 4} bunchgrass Hilaria rigida, and the CAM succulent Agave deserti are co-dominants. These perennials are relatively short with overlapping shallow roots facilitating the experimental measurements as well as leading to competition for soil water. Net CO{sub 2} uptake over 24-h periods measured in the laboratory will be analyzed using an environmental productivity index (EPI) that can incorporate simultaneous effects of soil water, air temperature, and light. Based on EPI, net CO{sub 2} uptake and hence plant productivity will be predicted for the three species in the field under various treatments. Activity of the two CO{sub 2} fixation enzymes, Rubisco and PEPCase, will be determined for these various environmental conditions; also, partitioning of carbon to various organs will be measured based on {sup 14}CO{sub 2} labeling and dry weight analysis. Thus, enzymatic and partitioning controls on competition among sympatric model plants representing all threemore » photosynthetic pathways will be investigated.« less

Authors:
Publication Date:
Research Org.:
California Univ., Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
584914
Report Number(s):
DOE/ER/61686-T1
ON: DE98004293; TRN: AHC29808%%54
DOE Contract Number:  
FG03-93ER61686
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 17 Dec 1997
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; CLIMATIC CHANGE; CARBON DIOXIDE; BIOLOGICAL INDICATORS; PROGRESS REPORT; PHOTOSYNTHESIS; ARID LANDS; TERRESTRIAL ECOSYSTEMS; BIOLOGICAL PATHWAYS; METABOLISM; BIOLOGICAL EFFECTS; PLANTS

Citation Formats

Nobel, P S. Impact of global climate change on ecosystem-level interactions among sympatric plants from all three photosynthetic pathways. Terminal report. United States: N. p., 1997. Web. doi:10.2172/584914.
Nobel, P S. Impact of global climate change on ecosystem-level interactions among sympatric plants from all three photosynthetic pathways. Terminal report. United States. https://doi.org/10.2172/584914
Nobel, P S. Wed . "Impact of global climate change on ecosystem-level interactions among sympatric plants from all three photosynthetic pathways. Terminal report". United States. https://doi.org/10.2172/584914. https://www.osti.gov/servlets/purl/584914.
@article{osti_584914,
title = {Impact of global climate change on ecosystem-level interactions among sympatric plants from all three photosynthetic pathways. Terminal report},
author = {Nobel, P S},
abstractNote = {The proposed research will determine biochemical and physiological responses to variations in environmental factors for plants of all three photosynthetic pathways under competitive situations in the field. These responses will be used to predict the effects of global climatic change on an ecosystem in the northwestern Sonoran Desert where the C{sub 3} subshrub Encelia farinosa, the C{sub 4} bunchgrass Hilaria rigida, and the CAM succulent Agave deserti are co-dominants. These perennials are relatively short with overlapping shallow roots facilitating the experimental measurements as well as leading to competition for soil water. Net CO{sub 2} uptake over 24-h periods measured in the laboratory will be analyzed using an environmental productivity index (EPI) that can incorporate simultaneous effects of soil water, air temperature, and light. Based on EPI, net CO{sub 2} uptake and hence plant productivity will be predicted for the three species in the field under various treatments. Activity of the two CO{sub 2} fixation enzymes, Rubisco and PEPCase, will be determined for these various environmental conditions; also, partitioning of carbon to various organs will be measured based on {sup 14}CO{sub 2} labeling and dry weight analysis. Thus, enzymatic and partitioning controls on competition among sympatric model plants representing all three photosynthetic pathways will be investigated.},
doi = {10.2172/584914},
url = {https://www.osti.gov/biblio/584914}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {12}
}