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Interaction between light and chilling temperature on the inhibition of photosynthesis in chilling-sensitive plants

By: Contributor(s): Material type: ArticleArticleLanguage: English Description: 6(2):117-123Subject(s): LOC classification:
  • 20661
 In: Plant, Cell and EnvironmentSummary: Se expusieron hojas completamente expandidas de Phaseolus vulgaris cv. Hawkesbury Wonder y de otras 6 especies, cultivadas a 25 grados centigrados, a 3 h de temp. de enfriamiento (6 grados centigrados) a densidades de flujo fotonico equivalentes a luz solar plena. En P. vulgaris, este tratamiento produjo una considerable reduccion del rendimiento subsiguiente a la cantidad de asimilacion de CO2, lo cual indica una reduccion en la eficiencia fotoquimica de la fotosintesis. La magnitud de la inhibicion dependio de la densidad del flujo fotonico durante el enfriamiento y no hubo inhibicion cuando el enfriamiento ocurrio a una baja densidad del flujo fotonico. No hubo inhibicion a temp. mayores de 11.5 grados centigrados, aun en presencia del equivalente a la luz solar plena. Esta interaccion entre el enfriamiento y la luz para causar la inhibicion de la fotosintesis fue promovida por la presencia de O2 a presion parcial normal de aire y no la afecto la presion parcial de CO2 presente cuando se presento el enfriamiento en el aire. Cuando el enfriamiento se presento a bajas presiones parciales de O2, el CO2 fue efectivo para reducir el grado de inhibicion. (RA-CIAT)Summary: Fully expanded leaves of Phaseolus vulgaris cv. Hawkesbury Wonder and 6 other species, grown at 25 degrees Celsius, were exposed for 3 h to chilling temp. (6 degrees Celsius) at photon flux densities equivalent to full sunlight. In P. vulgaris this treatment resulted in substantial inhibition of the subsequent quantum yield of CO2 uptake, indicating reduction of the photochemical efficiency of photosynthesis. The extent of inhibition depended on the photon flux density during chilling and no inhibition occurred when chilling occurred at a low photon flux density. No inhibition occurred at more than 11.5 degrees Celsius , even in the presence of the equivalent of full sunlight. This interaction between chilling and light to cause inhibition of photosynthesis was promoted by the presence of O2 at normal air partial pressure and was unaffected by the CO2 partial pressure present when chilling occurred in air. When chilling occurred at low O2 partial pressures, CO2 was effective in reducing the degree of inhibition. (AS)
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Journal Article Journal Article CIAT Library Document collection CINFOS Document Collection CINFOS 20661 (Browse shelf(Opens below)) c.1 Short Loan 100040558
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Se expusieron hojas completamente expandidas de Phaseolus vulgaris cv. Hawkesbury Wonder y de otras 6 especies, cultivadas a 25 grados centigrados, a 3 h de temp. de enfriamiento (6 grados centigrados) a densidades de flujo fotonico equivalentes a luz solar plena. En P. vulgaris, este tratamiento produjo una considerable reduccion del rendimiento subsiguiente a la cantidad de asimilacion de CO2, lo cual indica una reduccion en la eficiencia fotoquimica de la fotosintesis. La magnitud de la inhibicion dependio de la densidad del flujo fotonico durante el enfriamiento y no hubo inhibicion cuando el enfriamiento ocurrio a una baja densidad del flujo fotonico. No hubo inhibicion a temp. mayores de 11.5 grados centigrados, aun en presencia del equivalente a la luz solar plena. Esta interaccion entre el enfriamiento y la luz para causar la inhibicion de la fotosintesis fue promovida por la presencia de O2 a presion parcial normal de aire y no la afecto la presion parcial de CO2 presente cuando se presento el enfriamiento en el aire. Cuando el enfriamiento se presento a bajas presiones parciales de O2, el CO2 fue efectivo para reducir el grado de inhibicion. (RA-CIAT)

Fully expanded leaves of Phaseolus vulgaris cv. Hawkesbury Wonder and 6 other species, grown at 25 degrees Celsius, were exposed for 3 h to chilling temp. (6 degrees Celsius) at photon flux densities equivalent to full sunlight. In P. vulgaris this treatment resulted in substantial inhibition of the subsequent quantum yield of CO2 uptake, indicating reduction of the photochemical efficiency of photosynthesis. The extent of inhibition depended on the photon flux density during chilling and no inhibition occurred when chilling occurred at a low photon flux density. No inhibition occurred at more than 11.5 degrees Celsius , even in the presence of the equivalent of full sunlight. This interaction between chilling and light to cause inhibition of photosynthesis was promoted by the presence of O2 at normal air partial pressure and was unaffected by the CO2 partial pressure present when chilling occurred in air. When chilling occurred at low O2 partial pressures, CO2 was effective in reducing the degree of inhibition. (AS)

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