Température nocturne et photosynthèse. II. Une chambre d'assimilation climatisée pour la mesure des échanges gazeux de plantes entières

Agronomie ◽  
1982 ◽  
Vol 2 (8) ◽  
pp. 777-782 ◽  
Author(s):  
Jean-Jacques LONGUENESSE ◽  
Georges CONUS ◽  
Claude SARROUY
Keyword(s):  
Échanges Gazeux

Interactions entre mitochondries et chloroplastes dans la cellule. III. Evolution des échanges gazeux des spores de Funaria hygrometrica au cours d'un séjour à l'obscurité

1980 ◽  
Vol 58 (8) ◽  
pp. 841-846
Author(s):  
D. Chevallier ◽  
F. Nurit ◽  
R. Douce
Keyword(s):  
Liquid Medium ◽  
Mitochondrial Respiration ◽  
Rapid Decrease ◽  
Quiescent State ◽  
Funaria Hygrometrica ◽  
General Metabolism ◽  
Short Period ◽  
Échanges Gazeux

In darkness, in an inorganic liquid medium the spores of Funaria hygrometrica demonstrate a rapid increase from low to high metabolism activity with mitochondrial respiration functioning at its maximal value. The spore respiration is high during a short period of time corresponding to the transformation of the proplastids into chloroplasts. Then, the spore respiration slows down progressively. This diminution is due to a rapid decrease of the general metabolism. Under these conditions, the germination cannot take place and the spores appear to return to a quiescent state.

Échanges gazeux de la tomate de serre cultivée sous éclairage d’appoint

1993 ◽  
Vol 73 (2) ◽  
pp. 577-585 ◽  
Author(s):  
Martine Dorais ◽  
Josée Charbonneau ◽  
André Gosselin
Keyword(s):  
Regression Analysis ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Photosynthetic Activity ◽  
Photon Flux ◽  
Tomato Seedlings ◽  
Échanges Gazeux ◽  
Supplemental Lighting ◽  
High Level

This study reports on in situ gas-exchange measurements in tomatoes grown under a sequential intercropping system with supplemental lighting provided by high-pressure sodium-vapour lamps. A supplemental photosynthetic photon flux (PPF) of 150 μmol m−2 s−1 significantly increased the amount of light energy penetrating the canopy of intercropped tomato seedlings. During the day, the supplemental 150 μmol m−2 s−1 light regime increased the photosynthetic rate of leaves 5 and 10 by 67%, while at night the increases were 93 and 12%, respectively. Regression analysis of the photosynthetic rate of leaves 5 and 10 as a function of PPF received accounts for 58 and 45% of the variation, respectively. Hierarchical analysis demonstrated a significant linear relationship between PPF received during the day and photosynthetic activity of leaves 5 and 10 accounting for 46 and 28%, respectively, of the variance in the model. Regression analysis of the photosynthetic activity as a function of PPF received at night accounts for 41 and 32%, respectively, of the variation in the photosynthetic rate of leaves 5 and 10. Using a high level of supplemental lighting during the day or at night had no significant effect on stomatic conductance or on the transpiration rate of leaves. Key words: Stomatal conductance, photosynthetic photo flux, Lycopersicon esculentum, photosynthesis, transpiration rate

Les Échanges Gazeux, Rapport

2007 ◽  
pp. 40-43
Author(s):  
Marc Antonello ◽  
Dominique Delplanque
Keyword(s):  
Échanges Gazeux
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