Influence of infection by Corynespora cassiicola on carbon dioxide assimilation rate in Hevea leaves

Nugawela A., . and Liyanage N. I. S., . and Liyanage A. de S., . and Aluthhewage R. K., . Influence of infection by Corynespora cassiicola on carbon dioxide assimilation rate in Hevea leaves. pp. 233-238. ISSN 0127-7065

Leaf infection by Corynespora cassiicola has been detected in a number of Hevea clones grown in Sri Lanka. The CO2 assimilation rates and related parameters of apparently healthy tissues in infected leaves of highly susceptible moderately susceptible and mildly susceptible Hevea clones were studied. The CO2 assimilation rates were lower in apparently healthy tissues of infected leaves. The reduction was more marked in susceptible clones. There was no difference in the chlorophyll content in healthy leaves and in apparently healthy tissues of infected leaves used for measuring gas-exchange parameters. The changes in stomatal conductances internal CO2 concentration and apparent quantum efficiency (CO2) suggested that lowering of CO2 assimilation rates was due to changes in the photosynthetic mechanism of infected leaves. Toxic compounds liberated by the fungus might bring about such changes in the photosynthetic mechanism. The productivity in highly susceptible clones was affected by lower conversion efficiencies of the infected leaves and light interception capacities of the canopies.

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Abstract

Leaf infection by Corynespora cassiicola has been detected in a number of Hevea clones grown in Sri Lanka. The CO2 assimilation rates and related parameters of apparently healthy tissues in infected leaves of highly susceptible moderately susceptible and mildly susceptible Hevea clones were studied. The CO2 assimilation rates were lower in apparently healthy tissues of infected leaves. The reduction was more marked in susceptible clones. There was no difference in the chlorophyll content in healthy leaves and in apparently healthy tissues of infected leaves used for measuring gas-exchange parameters. The changes in stomatal conductances internal CO2 concentration and apparent quantum efficiency (CO2) suggested that lowering of CO2 assimilation rates was due to changes in the photosynthetic mechanism of infected leaves. Toxic compounds liberated by the fungus might bring about such changes in the photosynthetic mechanism. The productivity in highly susceptible clones was affected by lower conversion efficiencies of the infected leaves and light interception capacities of the canopies.

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Item Type:	Article
AGROVOC Term:	Hevea
AGROVOC Term:	Leaves
AGROVOC Term:	Corynespora cassiicola
AGROVOC Term:	Clones
AGROVOC Term:	Carbon dioxide
AGROVOC Term:	Infection
AGROVOC Term:	Gas exchange
AGROVOC Term:	Measurement
AGROVOC Term:	Chlorophylls
AGROVOC Term:	Photosynthesis
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23535

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