Productivity of leaves of a tropical tree, Theobroma Cacao, grown under shading, in relation to leaf age and light conditions within the canopy
The photosynthetic and respiratory activities of the leaves of a tropical tree, cacao, Theobroma cacao L., grown under shading, were determined in relation to leaf age and light conditions within the canopy, in order to gain a deeper insight into characteristics of the leaf population composing a canopy. The specific leaf weight and leaf water content varied with the height of leaves from the ground and/or the irradiance. The net photosynthetic rate also varied markedly depending on leaf age and irradiance. The leaves in full or nearly full irradiance (< 70 % full daylight) attained the maximum rate c. 60 d after the leaves emerged, and the rate decreased to nearly zero at a leaf age of c. 270 d. The nocturnal leaf respiratory activity was proportional to the photosynthetic activity during the day, but the proportional ratio was not constant throughout the survival period of leaves. Within the closed canopy, the upper leaves, which much higher ratios of respiratory to photosynthetic activity, under full or nearly full irradiance, tended to have much shorter mean longevities (c. 160 d) than the lower leaves under a lower irradiance (c. 310 d).
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Format: | biblioteca |
Language: | eng |
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New Jersey (EUA): Wiley,
1997
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Subjects: | ERYTHRINA POEPPIGIANA, UMBRIA, CUBIERTA DE COPAS, DENSIDAD DE FLUJO RADIANTE, FOTOSINTESIS, RESPIRACION, THREOBROMA CACAO, LEAVES, |
Online Access: | https://doi.org/10.1046/j.1469-8137.1997.00841.x |
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KOHA-OAI-BVE:1259612021-12-17T16:42:36ZProductivity of leaves of a tropical tree, Theobroma Cacao, grown under shading, in relation to leaf age and light conditions within the canopy 94733 Miyajil, K.I.C. 119202 Silva, W.S. da 42291 Alvim, P.D.T. autores/as New Jersey (EUA): Wiley,1997engpdfThe photosynthetic and respiratory activities of the leaves of a tropical tree, cacao, Theobroma cacao L., grown under shading, were determined in relation to leaf age and light conditions within the canopy, in order to gain a deeper insight into characteristics of the leaf population composing a canopy. The specific leaf weight and leaf water content varied with the height of leaves from the ground and/or the irradiance. The net photosynthetic rate also varied markedly depending on leaf age and irradiance. The leaves in full or nearly full irradiance (< 70 % full daylight) attained the maximum rate c. 60 d after the leaves emerged, and the rate decreased to nearly zero at a leaf age of c. 270 d. The nocturnal leaf respiratory activity was proportional to the photosynthetic activity during the day, but the proportional ratio was not constant throughout the survival period of leaves. Within the closed canopy, the upper leaves, which much higher ratios of respiratory to photosynthetic activity, under full or nearly full irradiance, tended to have much shorter mean longevities (c. 160 d) than the lower leaves under a lower irradiance (c. 310 d). Incluye 34 referencias bibliográficas en las páginas 471-472The photosynthetic and respiratory activities of the leaves of a tropical tree, cacao, Theobroma cacao L., grown under shading, were determined in relation to leaf age and light conditions within the canopy, in order to gain a deeper insight into characteristics of the leaf population composing a canopy. The specific leaf weight and leaf water content varied with the height of leaves from the ground and/or the irradiance. The net photosynthetic rate also varied markedly depending on leaf age and irradiance. The leaves in full or nearly full irradiance (< 70 % full daylight) attained the maximum rate c. 60 d after the leaves emerged, and the rate decreased to nearly zero at a leaf age of c. 270 d. The nocturnal leaf respiratory activity was proportional to the photosynthetic activity during the day, but the proportional ratio was not constant throughout the survival period of leaves. Within the closed canopy, the upper leaves, which much higher ratios of respiratory to photosynthetic activity, under full or nearly full irradiance, tended to have much shorter mean longevities (c. 160 d) than the lower leaves under a lower irradiance (c. 310 d). ERYTHRINA POEPPIGIANAUMBRIACUBIERTA DE COPASDENSIDAD DE FLUJO RADIANTEFOTOSINTESISRESPIRACIONTHREOBROMA CACAOLEAVESNew Phytologist (RU)https://doi.org/10.1046/j.1469-8137.1997.00841.x |
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ERYTHRINA POEPPIGIANA UMBRIA CUBIERTA DE COPAS DENSIDAD DE FLUJO RADIANTE FOTOSINTESIS RESPIRACION THREOBROMA CACAO LEAVES ERYTHRINA POEPPIGIANA UMBRIA CUBIERTA DE COPAS DENSIDAD DE FLUJO RADIANTE FOTOSINTESIS RESPIRACION THREOBROMA CACAO LEAVES |
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ERYTHRINA POEPPIGIANA UMBRIA CUBIERTA DE COPAS DENSIDAD DE FLUJO RADIANTE FOTOSINTESIS RESPIRACION THREOBROMA CACAO LEAVES ERYTHRINA POEPPIGIANA UMBRIA CUBIERTA DE COPAS DENSIDAD DE FLUJO RADIANTE FOTOSINTESIS RESPIRACION THREOBROMA CACAO LEAVES 94733 Miyajil, K.I.C. 119202 Silva, W.S. da 42291 Alvim, P.D.T. autores/as Productivity of leaves of a tropical tree, Theobroma Cacao, grown under shading, in relation to leaf age and light conditions within the canopy |
description |
The photosynthetic and respiratory activities of the leaves of a tropical tree, cacao, Theobroma cacao L., grown under shading, were determined in relation to leaf age and light conditions within the canopy, in order to gain a deeper insight into characteristics of the leaf population composing a canopy. The specific leaf weight and leaf water content varied with the height of leaves from the ground and/or the irradiance. The net photosynthetic rate also varied markedly depending on leaf age and irradiance. The leaves in full or nearly full irradiance (< 70 % full daylight) attained the maximum rate c. 60 d after the leaves emerged, and the rate decreased to nearly zero at a leaf age of c. 270 d. The nocturnal leaf respiratory activity was proportional to the photosynthetic activity during the day, but the proportional ratio was not constant throughout the survival period of leaves. Within the closed canopy, the upper leaves, which much higher ratios of respiratory to photosynthetic activity, under full or nearly full irradiance, tended to have much shorter mean longevities (c. 160 d) than the lower leaves under a lower irradiance (c. 310 d). |
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ERYTHRINA POEPPIGIANA UMBRIA CUBIERTA DE COPAS DENSIDAD DE FLUJO RADIANTE FOTOSINTESIS RESPIRACION THREOBROMA CACAO LEAVES |
author |
94733 Miyajil, K.I.C. 119202 Silva, W.S. da 42291 Alvim, P.D.T. autores/as |
author_facet |
94733 Miyajil, K.I.C. 119202 Silva, W.S. da 42291 Alvim, P.D.T. autores/as |
author_sort |
94733 Miyajil, K.I.C. |
title |
Productivity of leaves of a tropical tree, Theobroma Cacao, grown under shading, in relation to leaf age and light conditions within the canopy |
title_short |
Productivity of leaves of a tropical tree, Theobroma Cacao, grown under shading, in relation to leaf age and light conditions within the canopy |
title_full |
Productivity of leaves of a tropical tree, Theobroma Cacao, grown under shading, in relation to leaf age and light conditions within the canopy |
title_fullStr |
Productivity of leaves of a tropical tree, Theobroma Cacao, grown under shading, in relation to leaf age and light conditions within the canopy |
title_full_unstemmed |
Productivity of leaves of a tropical tree, Theobroma Cacao, grown under shading, in relation to leaf age and light conditions within the canopy |
title_sort |
productivity of leaves of a tropical tree, theobroma cacao, grown under shading, in relation to leaf age and light conditions within the canopy |
publisher |
New Jersey (EUA): Wiley, |
publishDate |
1997 |
url |
https://doi.org/10.1046/j.1469-8137.1997.00841.x |
work_keys_str_mv |
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_version_ |
1756064857903333376 |