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Effect of high temperature on photosynthesis in beans. I. Oxygen evolution and chlorophyll fluorescence

Pastenes, C. (Universidad de Chile, Santiago, Chile.) ; Horton, P

Plant physiology (Bethesda), 1996-11, Vol.112 (3), p.1245-1251 [Periódico revisado por pares]

Rockville, MD: American Society of Plant Physiologists

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Título:
Effect of high temperature on photosynthesis in beans. I. Oxygen evolution and chlorophyll fluorescence
Autor: Pastenes, C. (Universidad de Chile, Santiago, Chile.) ; Horton, P
Assuntos: Agronomy. Soil science and plant productions ; Biological and medical sciences ; CALOR ; CHALEUR ; CHLOROPHYLLE ; Chlorophylls ; Chloroplasts ; CLOROFILAS ; ECHANGE GAZEUX ; Economic plant physiology ; FLUORESCENCE ; FLUORESCENCIA ; FOTOINHIBICION ; FOTOSISTEMAS ; Fundamental and applied biological sciences. Psychology ; High temperature ; INTERCAMBIO DE GASES ; LUMIERE ; Luminous intensity ; LUZ ; Metabolism ; Net assimilation, photosynthesis, carbon metabolism. Photorespiration, respiration, fermentation (anoxia, hypoxia) ; Nutrition. Photosynthesis. Respiration. Metabolism ; OBSCURIDAD ; OBSCURITE ; OXIGENO ; OXIRREDUCION ; OXYDOREDUCTION ; OXYGENE ; PHASEOLUS VULGARIS ; PHOTOINHIBITION ; Photosynthesis ; Photosynthesis, respiration. Anabolism, catabolism ; Photosystem II ; PHOTOSYSTEME ; Plant physiology and development ; Plants ; PROTEINAS ; PROTEINE ; RESISTANCE A LA TEMPERATURE ; RESISTENCIA A LA TEMPERATURA ; TEMPERATURA ; TEMPERATURE ; Temperature ratio ; THYLAKOIDE ; Thylakoids ; TILACOIDES ; VARIEDADES ; VARIETE ; Whole Plant, Environmental, and Stress Physiology
É parte de: Plant physiology (Bethesda), 1996-11, Vol.112 (3), p.1245-1251
Notas: F60
F30
9715016
Descrição: We studied the effect of increasing temperature on photosynthesis in two bean (Phaseolus vulgaris L.) varieties known to differ in their resistance to extreme high temperatures, Blue Lake (BL), commercially available in the United Kingdom, and Barbucho (BA), noncommercially bred in Chile. We paid particular attention to the energy-transducing mechanisms and structural responses inferred from fluorescence kinetics. The study was conducted in nonphotorespiratory conditions. Increases in temperature resulted in changes in the fluorescence parameters nonphotochemical quenching (qN) and photochemical quenching (qP) in both varieties, but to a different extent. In BL and BA the increase in qP and the decrease in qN were either completed at 30 degrees C or slightly changed following increases from 30 to 35 degrees C. No indication of photoinhibition was detected at any temperature, and the ratio of the quantum efficiencies of photosystem II (PSII) and O2 evolution remained constant from 20 to 35 degrees C. Measurements of 77-K fluorescence showed an increase in the photosystem I (PSI)/PSII ratio with temperature, suggesting an increase in the state transitions. In addition, measurements of fast-induction fluorescence revealed that the proportion of PSII beta centers increased with increasing temperatures. The extent of both changes were maximum at 30 to 35 degrees C, coinciding with the ratio of rates at temperatures differing by 10 degrees C for oxygen evolution
Editor: Rockville, MD: American Society of Plant Physiologists
Idioma: Inglês

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Effect of high temperature on photosynthesis in beans. I. Oxygen evolution and chlorophyll fluorescence

Pastenes, C. (Universidad de Chile, Santiago, Chile.) ; Horton, P

Rockville, MD: American Society of Plant Physiologists

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