Chlorophyll fluorescence and gas exchange characteristics of cocoa
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Date
2007-02-08
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Abstract
The chlorophyll fluorescence, net photosynthesis (Pn) and related stomatal characters were studied in cocoa trees. There were significant seasonal variations in chlorophyll fluorescence indices and gas exchange characteristics in cocoa. The F0 value was significantly higher in drought susceptible accession type showing that. PS II was affected to a greater extent. However, Fm and Fv were lower in drought tolerant trees as compared to susceptible ones. This was in parallel with lower Pn in tolerant type. Drought tolerant accession had higher stomatal diffusive resistance resulting in decreased transpiration rate. The rs was negatively correlated with transpiration. These fluorescence signatures reflect on the intactness of the photosystems even at closed stomata in tolerant types during stress periods. The relationships between Pn and fluorescence quenching parameters have also been studied.
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Keywords
cocoa, gas exchange, chlorophyll fluorescence
Citation
J.Plantn.Crops 1996 Suppl. v-24 p-524-529