Water vapor conductance and CO/sub 2/ uptake for leaves of a C/sub 4/ desert grass, Hilaria rigida

Title: Water vapor conductance and CO/sub 2/ uptake for leaves of a C/sub 4/ desert grass, Hilaria rigida

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Abstract

Availability of soil water was the major influence on seasonal stomatal activity of Hilaria rigida (Thurb.) Benth. ex Scibn. over a 2-yr study period in the Colorado desert section of the Sonoran desert. Major stomatal opening (water vapor conductance >2 mm/s) occurred for 4.6 mo in the relatively cool winter-spring (maximum daytime temperatures averaging 17/sup 0/C) and for 1.7 mo in the late summer-early fall (maximum daytime temperature averaging 31/sup 0/C). The temperature optimum for CO/sub 2/ uptake was generally above daytime temperatures, particularly in the winter. When the daytime growth temperature was raised from 16/sup 0/ to 49/sup 0/C in laboratory experiments, the temperature optimum for CO/sub 2/ uptake shifted from 29/sup 0/ to 43/sup 0/C. Besides the rather high temperature optimum for CO/sub 2/ uptake, H. rigida displayed other typical C/sub 4/ characteristics including Kranz anatomy, a low CO/sub 2/ compensation point (12 ..mu..1/1), and a lack of light saturation of CO/sub 2/ uptake at full sunlight. Under optimal field conditions, the CO/sub 2/ uptake rate can be 67 ..mu..mol.m/sup -2/.s/sup -1/ (106 mg CO/sub 2/.dm/sup -2/.h/sup -1/), higher than has been reported for any other species. The accompanying high water use efficiency (mass CO/sub 2/ taken upmore »« less

Authors:: Nobel, P S

Publication Date:: 1980-04-01

Research Org.:: Univ. of California, Los Angeles

OSTI Identifier:: 5024943

DOE Contract Number:: DE-AM03-76-SF00012

Resource Type:: Journal Article

Journal Name:: Ecology; (United States)

Additional Journal Information:: Journal Volume: 61:2

Country of Publication:: United States

Language:: English

Subject:: 59 BASIC BIOLOGICAL SCIENCES; CARBON DIOXIDE; METABOLISM; GRASS; TOLERANCE; PHOTOSYNTHESIS; TEMPERATURE EFFECTS; TRANSPIRATION; WATER VAPOR; ABSORPTIVITY; CARBON; CLIMATES; DESERTS; ECOLOGY; LEAVES; PHYSIOLOGY; PLANT CELLS; STOMATA; TERRESTRIAL ECOSYSTEMS; TIME DEPENDENCE; UPTAKE; VISIBLE RADIATION; ARID LANDS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; ECOSYSTEMS; ELECTROMAGNETIC RADIATION; ELEMENTS; FLUIDS; GASES; NONMETALS; OPENINGS; OPTICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; PHYSICAL PROPERTIES; PLANTS; RADIATIONS; SYNTHESIS; VAPORS; 550200* - Biochemistry; 551000 - Physiological Systems

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                    Nobel, P S. Water vapor conductance and CO/sub 2/ uptake for leaves of a C/sub 4/ desert grass, Hilaria rigida.  United States: N. p., 1980. 
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                    Nobel, P S. Water vapor conductance and CO/sub 2/ uptake for leaves of a C/sub 4/ desert grass, Hilaria rigida.  United States.

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                    Nobel, P S. Tue .  
        "Water vapor conductance and CO/sub 2/ uptake for leaves of a C/sub 4/ desert grass, Hilaria rigida".  United States.

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@article{osti_5024943,

  title        = {Water vapor conductance and CO/sub 2/ uptake for leaves of a C/sub 4/ desert grass, Hilaria rigida},

  author       = {Nobel, P S},

  abstractNote = {Availability of soil water was the major influence on seasonal stomatal activity of Hilaria rigida (Thurb.) Benth. ex Scibn. over a 2-yr study period in the Colorado desert section of the Sonoran desert. Major stomatal opening (water vapor conductance >2 mm/s) occurred for 4.6 mo in the relatively cool winter-spring (maximum daytime temperatures averaging 17/sup 0/C) and for 1.7 mo in the late summer-early fall (maximum daytime temperature averaging 31/sup 0/C). The temperature optimum for CO/sub 2/ uptake was generally above daytime temperatures, particularly in the winter. When the daytime growth temperature was raised from 16/sup 0/ to 49/sup 0/C in laboratory experiments, the temperature optimum for CO/sub 2/ uptake shifted from 29/sup 0/ to 43/sup 0/C. Besides the rather high temperature optimum for CO/sub 2/ uptake, H. rigida displayed other typical C/sub 4/ characteristics including Kranz anatomy, a low CO/sub 2/ compensation point (12 ..mu..1/1), and a lack of light saturation of CO/sub 2/ uptake at full sunlight. Under optimal field conditions, the CO/sub 2/ uptake rate can be 67 ..mu..mol.m/sup -2/.s/sup -1/ (106 mg CO/sub 2/.dm/sup -2/.h/sup -1/), higher than has been reported for any other species. The accompanying high water use efficiency (mass CO/sub 2/ taken up by leaf blades/mass H/sub 2/O lost) may help explain the success of this hardy grass in both the Mojave and Sonoran deserts.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/5024943},
  journal      = {Ecology; (United States)},
number       = ,

  volume       = 61:2,

  place        = {United States},

  year         = {1980},

  month        = {4}

}

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