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

Title: Influence of irradiation, soil water potential, and leaf temperature on leaf morphology of a desert broadleaf, Encelia farinosa Gray (Compositae)

Abstract

Laboratory experiments were performed to evaluate observed seasonal changes in leaf morphology of the desert perennial shrub, Encelia farinosa Gray. Plants were grown under low or high conditions of photosynthetically active irradiation, soil water potential (Psi/sup soil/), and leaf temperature (8 different experimental regimes). The relative growth rate, leaf water vapor conductance, leaf water potential, and leaf length were all greater for the high Psi/sup soil/ regimes, the largest leaves occurring at low irradiation. High irradiation during growth led to thicker leaves with a higher internal to external leaf area ratio (A/sup mes//A); low Psi/sup soil/ tended to increase A/sup mes//A somewhat. High irradiation also led to decreased absorptance to solar irradiation caused by increased pubescence. High leaf temperature during development resulted in slightly smaller, thicker leaves with higher A/sup mes//A. Thus, irradiation appeared to have its major influence on leaf thickness. A/sup mes//A, and absorptance, with a secondary effect on leaf length: Psi/sup soil/ affected primarily leaf length, growth rate, and water status, and secondarily A/sup mes//A. Results are discussed with regard to recent ecophysiological studies on the observed seasonal changes in leaf morphology of E. farinosa.

Authors:
;
Publication Date:
Research Org.:
Univ. of California, Los Angeles
OSTI Identifier:
6932239
Resource Type:
Journal Article
Journal Name:
Am. J. Bot.; (United States)
Additional Journal Information:
Journal Volume: 65:4
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; LEAVES; MORPHOLOGICAL CHANGES; SEASONAL VARIATIONS; BIOLOGICAL EFFECTS; DESERTS; GREENHOUSES; GROWTH; IRRADIATION; PHOTOSYNTHESIS; PLANTS; SEASONS; SHRUBS; SOILS; TEMPERATURE EFFECTS; VISIBLE RADIATION; WATER; ARID LANDS; BIOMASS; BUILDINGS; CHEMICAL REACTIONS; ELECTROMAGNETIC RADIATION; ENERGY SOURCES; HYDROGEN COMPOUNDS; OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; RADIATIONS; RENEWABLE ENERGY SOURCES; SYNTHESIS; VARIATIONS; 510100* - Environment, Terrestrial- Basic Studies- (-1989)

Citation Formats

Smith, W K, and Nobel, P S. Influence of irradiation, soil water potential, and leaf temperature on leaf morphology of a desert broadleaf, Encelia farinosa Gray (Compositae). United States: N. p., 1978. Web. doi:10.2307/2442699.
Smith, W K, & Nobel, P S. Influence of irradiation, soil water potential, and leaf temperature on leaf morphology of a desert broadleaf, Encelia farinosa Gray (Compositae). United States. https://doi.org/10.2307/2442699
Smith, W K, and Nobel, P S. Sat . "Influence of irradiation, soil water potential, and leaf temperature on leaf morphology of a desert broadleaf, Encelia farinosa Gray (Compositae)". United States. https://doi.org/10.2307/2442699.
@article{osti_6932239,
title = {Influence of irradiation, soil water potential, and leaf temperature on leaf morphology of a desert broadleaf, Encelia farinosa Gray (Compositae)},
author = {Smith, W K and Nobel, P S},
abstractNote = {Laboratory experiments were performed to evaluate observed seasonal changes in leaf morphology of the desert perennial shrub, Encelia farinosa Gray. Plants were grown under low or high conditions of photosynthetically active irradiation, soil water potential (Psi/sup soil/), and leaf temperature (8 different experimental regimes). The relative growth rate, leaf water vapor conductance, leaf water potential, and leaf length were all greater for the high Psi/sup soil/ regimes, the largest leaves occurring at low irradiation. High irradiation during growth led to thicker leaves with a higher internal to external leaf area ratio (A/sup mes//A); low Psi/sup soil/ tended to increase A/sup mes//A somewhat. High irradiation also led to decreased absorptance to solar irradiation caused by increased pubescence. High leaf temperature during development resulted in slightly smaller, thicker leaves with higher A/sup mes//A. Thus, irradiation appeared to have its major influence on leaf thickness. A/sup mes//A, and absorptance, with a secondary effect on leaf length: Psi/sup soil/ affected primarily leaf length, growth rate, and water status, and secondarily A/sup mes//A. Results are discussed with regard to recent ecophysiological studies on the observed seasonal changes in leaf morphology of E. farinosa.},
doi = {10.2307/2442699},
url = {https://www.osti.gov/biblio/6932239}, journal = {Am. J. Bot.; (United States)},
number = ,
volume = 65:4,
place = {United States},
year = {1978},
month = {4}
}