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Title: Leaf conductance in relation to rate of CO/sub 2/ assimilation. II. Effects of short-term exposures to different photon flux densities. [Zea mays; Phaseolus vulgaris; Eucalyptus pauciflora]

When photon flux density incident on attached leaves of Zea mays L. was varied from the equivalent of 0.12 of full sunlight to full sunlight, leaf conductance to CO/sub 2/ transfer, g, changed in proportion to the change in rate of CO/sub 2/, assimilation, A, with the result that intercellular partial pressure of CO/sub 2/ remained almost constant. The proportionality was the same as the previously found in g and A measured at one photon flux density in plants of Zea mays L. grown at different levels of mineral nutrition, light intensities, and ambient partial pressures of CO/sub 2/. In shade-grown Phaseolus vulgaris L., plants, A as photon flux density was increased from about 0.12 up to about 0.5 full sunlight, the proportionality being almost the same in plants grown at low and at high light intensity. When photon flux density incident on the adaxial an abaxial surfaces of the isolateral leaves of Eucalyptus pauciflora Sieb. ex Spreng was varied, g and A also varied proportionally. The leaf conductance in a particular surface was affected by the photon flux density at the opposite surface to a greater extent than was expected on the basis of transmittance. The results indicated thatmore » stomata may, in some way, be sensitive to the photon flux absorbed within the leaf as a whole. 5 references, 4 figures, 1 table.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
7119088
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plant Physiol.; (United States); Journal Volume: 78
Research Org:
Australian National Univ., Canberra City
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; CARBON DIOXIDE; UPTAKE; EUCALYPTUSES; PHOTOSYNTHESIS; MAIZE; PHASEOLUS; EXPERIMENTAL DATA; LEAVES; PARTIAL PRESSURE; PHOTONS; PLANT GROWTH; SOLAR RADIATION; STOMATA; BACTERIA; CARBON COMPOUNDS; CARBON OXIDES; CEREALS; CHALCOGENIDES; CHEMICAL REACTIONS; DATA; ELEMENTARY PARTICLES; GRASS; GROWTH; INFORMATION; LEGUMINOSAE; MASSLESS PARTICLES; MICROORGANISMS; NUMERICAL DATA; OPENINGS; OXIDES; OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; PLANTS; RADIATIONS; RHIZOBIUM; STELLAR RADIATION; SYNTHESIS; TREES 550500* -- Metabolism