Effectiveness of Uv‐b Radiation on the Growth and Physiology of Field‐grown Soybean Modified by Water Stress

Murali, N. S.; Teramura, Alan H.

doi:10.1111/j.1751-1097.1986.tb03588.x

Cited by 89 publications

(44 citation statements)

References 18 publications

(7 reference statements)

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“…Rack height, lamp spacing and lamp power were adjusted as needed to maintain a total daily flux of biologically effective UV-B radiation, normalized to 1.6 W m Ð2 d Ð1 (Caldwell, 1971). This relatively high level of UV-B radiation, which corresponds to the maximum midsummer and clear sky irradiance, that would be anticipated, was selected to compare with other studies (e. g. Murali and Teramura, 1986) rather than to attempt a realistic simulation of field conditions. Control plants were illuminated by lamps wrapped with a polyester film (Folanrm 0.1 mm; Floex, Munich, Germany) which blocks both UV-B and UV-C radiation.…”

Section: Plants and Cultivationmentioning

confidence: 99%

UV-B Effect on Constituents of Azolla caroliniana

Ibrahim

Mostafa

2007

Zeitschrift Für Naturforschung C

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Changes in growth and ultrastructure of Azolla caroliniana in response to elevated UV-B radiation were investigated. Exposure of plants to UV-B radiation for 1, 8, 16, 24 and 48 h exhibited a significant decrease in biomass and relative growth rate. This decrease resulted in an increase in doubling time over the control. Also, Chl a and b contents were significantly decreased especially after 16 h. The reduction was accompanied by a decrease in 5-aminolaevulinic acid content (precursor of chlorophyll). On the other hand, contents of carotenoid and UV-absorbing phenolic compounds (flavonoids and anthocyanins) were increased.

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Section: Plants and Cultivationmentioning

confidence: 99%

UV-B Effect on Constituents of Azolla caroliniana

Ibrahim

Mostafa

2007

Zeitschrift Für Naturforschung C

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“…Photosynthesis and photosynthetic productivity in many species can be inhibited by exposure to increased UV-B radiation (Murali & Teramura 1986;Strid, Chow & Anderson 1990;Sullivan & Teramura 1989;Teramura, Ziska & Sztein 1991;Ziska & Teramura 1992;He et al 1993;Middleton & Teramura 1993;He etal. 1994a;Day & Vogelmann 1995).…”

Section: Introductionmentioning

confidence: 99%

Analysis of limitations to CO₂ assimilation on exposure of leaves of two Brassica napus cultivars to UV‐B

Allen

Mckee

Farage

et al. 1997

Plant Cell & Environment

158

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Apex and Bristol cultivars of oilseed rape {Brassica napus) were irradiated with 0-63 W m~^ of UV-B over 5 d. Analyses of the response of net leaf carbon assimilation to intercellular CO2 concentration were used to examine the potential limitations imposed by stomata, carboxylation velocity and capacity for regeneration of ribulose 1,5-bisphosphate on leaf photosynthesis. Simultaneous measurements of chlorophyll fluorescence were used to estimate the maximum quantum efficiency of photosystem II (PSII) photochemistry, the quantum efficiency of linear electron transport at steady-state photosynthesis, and the light and CO2-saturated rate of linear electron transport. Ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) content and activities were assayed in vitro. In both cultivars the UV-B treatment resulted in decreases in the light-saturated rate of CO2 assimilation, which were accompanied by decreases in carboxylation velocity and Rubisco content and activity. No major effects of UV-B were observed on end-product inhibition and stomatal limitation of photosynthesis or the rate of photorespiration relative to CO2 assimilation. In the Bristol cultivar, photoinhibition of PSII and loss of linear electron transport activity were observed when CO2 assimilation was severely inhibited. However, the Apex cultivar exhibited no major inhibition of PSII photochemistry or linear electron transport as the rate of CO2 assimilation decreased. It is concluded that loss of Rubisco is a primary factor in UV-B inhibition of CO2 assimilation.Key-words: Brassica napus; electron transport; fluorescence; leaf gas exchange; photosynthesis; photosystem II; Rubisco; ultraviolet-B radiation.Abbreviations: A, net CO2 assimilation rate; A^.^^, light-saturated net CO2 assimilation rate; Cj, intercellular CO2 concentration; Fo, F^, E^, minimal, maximal and variable fluorescence yields; F,^', EJ, E^, maximal, variable and steady-state fluorescence yields in a light-adapted state; ^max.RuBP' maximum potential rate of electron transport contributing to RuBP regeneration; imax.psii' rate of PSII electron transport at saturating light and CO2; PPFD, photosynthetically active photon flux density; RuBP, ribulose 1,5-bisphosphate; Rubisco, ribulose 1,5-bisphosphate carboxylase/oxygenase; V^..^^^, maximum carboxylation velocity of Rubisco; ^psn, relative quantum efficiency of PSII photochemistry.

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“…effectiveness may be modified by other environmental factors (20). For example, sensitivity to UV-B radiation is influenced by growing conditions such as low PPFD (18), mineral deficiency (19), and water stress (20). Multiple simultaneous stresses, such as increases in solar UV-B radiation and drought, could lead to additive, compensatory or other synergistic effects on plant physiology and crop yield.…”

mentioning

confidence: 99%

“…Ultraviolet-B radiation has been shown to reduce photosynthesis by direct alterations of photosystem II (14), while its effects on stomatal conductance is minimal (20,22). Drought may reduce photosynthesis by both stomatal closure and biochemical effects (3,6).…”

mentioning

confidence: 99%

“…2 Abbreviations: UV-B, ultraviolet radiation between 290 and 320 nm; RuBP, ribulose 1,5-bisphosphate; UV-BBE, biologically effective ultraviolet-B radiation; A, CO2 assimilation; E, transpiration; g5, stomatal conductance; Ci, internal CO2 concentration; AQE, apparent quantum efficiency; CEC, cation exchange capacity. effectiveness may be modified by other environmental factors (20). For example, sensitivity to UV-B radiation is influenced by growing conditions such as low PPFD (18), mineral deficiency (19), and water stress (20).…”

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confidence: 99%

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Field Study of the Interaction between Solar Ultraviolet-B Radiation and Drought on Photosynthesis and Growth in Soybean

Sullivan¹,

Teramura²

1990

Plant Physiol.

Self Cite

190

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Soybean, Glycine max (L.) Merr. cv Essex, plants were grown in the field in a 2 x 2 factorial design, under ambient and supplemental levels of ultraviolet-B (UV-B) radiation (supplemental daily dose of 5.1 effective kilojoules per square meter) and were either well-watered or subjected to drought. Soil water potentials were reduced to -2.0 megapascals by the exclusion of natural precipitation in the drought plots and were maintained at approximately -0.5 megapascal by supplemental irrigation in well-watered plots. Plant growth and gas exchange characteristics were affected under both drought and supplemental UV-B radiation. Whole-leaf gas exchange analysis indicated that stomatal limitations on photosynthesis were only significantly affected by the combination of UV-B radiation and drought but substrate (ribulose bisphosphate) regeneration limitations were observed under either stress. The combined effect of both drought and UV-B radiation on photosynthetic gas exchange was a reduction in apparent quantum efficiency and the rapid appearance of biochemical limitations to photosynthesis concomitant with reduced diffusional limitations. However, the combination of stresses did not result in additive effects on total plant growth or seed yield compared to reductions under either stress independently.Reductions in global stratospheric ozone column thickness of 1.7 to 3.0% from 1969 to 1986 have recently been reported with seasonal reductions of up to 50% over the Antarctic (21). Such reductions are projected to result in increased solar UV-B2 radiation reaching the earth's surface. UV-B radiation has been shown to reduce plant biomass, leaf area, and photosynthetic capacity in soybean (Glycine max [L.] Merr.), and its '

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Effectiveness of Uv‐b Radiation on the Growth and Physiology of Field‐grown Soybean Modified by Water Stress

Cited by 89 publications

References 18 publications

UV-B Effect on Constituents of Azolla caroliniana

UV-B Effect on Constituents of Azolla caroliniana

Analysis of limitations to CO₂ assimilation on exposure of leaves of two Brassica napus cultivars to UV‐B

Field Study of the Interaction between Solar Ultraviolet-B Radiation and Drought on Photosynthesis and Growth in Soybean

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Effectiveness of Uv‐b Radiation on the Growth and Physiology of Field‐grown Soybean Modified by Water Stress

Cited by 89 publications

References 18 publications

UV-B Effect on Constituents of Azolla caroliniana

UV-B Effect on Constituents of Azolla caroliniana

Analysis of limitations to CO2 assimilation on exposure of leaves of two Brassica napus cultivars to UV‐B

Field Study of the Interaction between Solar Ultraviolet-B Radiation and Drought on Photosynthesis and Growth in Soybean

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Analysis of limitations to CO₂ assimilation on exposure of leaves of two Brassica napus cultivars to UV‐B