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• W2031415250 endingPage "252" @default.
• W2031415250 startingPage "245" @default.
• W2031415250 abstract "The effect of natural shading on photosynthetic capacity and chloroplast thylakoid membrane function was examined in soybean (Glycine max. cv Young) under field conditions using a randomized complete block design. Seedlings were thinned to 15 plants per square meter at 20 days after planting. Leaves destined to function in the shaded regions of the canopy were tagged during early expansion at 40 days after planting. To investigate the response of shaded leaves to an increase in available light, plants were removed from certain plots at 29 or 37 days after tagging to reduce the population from 15 to three plants per square meter and alter the irradiance and spectral quality of light. During the transition from a sun to a shade environment, maximum photosynthesis and chloroplast electron transport of control leaves decreased by two- to threefold over a period of 40 days followed by rapid senescence and abscission. Senescence and abscission of tagged leaves were delayed by more than 4 weeks in plots where plant populations were reduced to three plants per square meter. Maximum photosynthesis and chloroplast electron transport activity were stabilized or elevated in response to increased light when plant populations were reduced from 15 to three plants per square meter. Several chloroplast thylakoid membrane components were affected by light environment. Cytochrome f and coupling factor protein decreased by 40% and 80%, respectively, as control leaves became shaded and then increased when shaded leaves acclimated to high light. The concentrations of photosystem I (PSI) and photosystem II (PSII) reaction centers were not affected by light environment or leaf age in field grown plants, resulting in a constant PSII/PSI ratio of 1.6 +/- 0.3. Analysis of the chlorophyll-protein composition revealed a shift in chlorophyll from PSI to PSII as leaves became shaded and a reversal of this process when shaded leaves were provided with increased light. These results were in contrast to those of soybeans grown in a growth chamber where the PSII/PSI ratio as well as cytochrome f and coupling factor protein levels were dependent on growth irradiance. To summarize, light environment regulated both the photosynthetic characteristics and the timing of senescence in soybean leaves grown under field conditions." @default.
• W2031415250 created "2016-06-24" @default.
• W2031415250 creator A5027811365 @default.
• W2031415250 creator A5065545607 @default.
• W2031415250 date "1991-09-01" @default.
• W2031415250 modified "2023-10-11" @default.
• W2031415250 title "Response of Soybean Photosynthesis and Chloroplast Membrane Function to Canopy Development and Mutual Shading" @default.
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• W2031415250 doi "https://doi.org/10.1104/pp.97.1.245" @default.
• W2031415250 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1080990" @default.
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• W2031415250 hasPublicationYear "1991" @default.
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