Leaf gas exchange and chlorophyll <Emphasis Type="Italic">a</Emphasis> fluorescence of <Emphasis Type="Italic">Eucalyptus urophylla</Emphasis> in response to <Emphasis Type="Italic">Puccinia psidii</Emphasis> infection |
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Authors: | Alexandre Alonso Alves Lúcio Mauro da Silva Guimarães Agnaldo Rodrigues de Melo Chaves Fábio Murilo DaMatta Acelino Couto Alfenas |
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Institution: | 1.Embrapa Agroenergy, PqEB,Brasilia,Brazil;2.Graduate Program in Genetics and Breeding,Federal University of Vi?osa,Vi?osa,Brazil;3.Department of Plant Pathology,Federal University of Vi?osa,Vi?osa,Brazil;4.Department of Plant Biology,Federal University of Vi?osa,Vi?osa,Brazil |
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Abstract: | One of the most important diseases of eucalyptus plantations is caused by the rust fungus Puccinia psidii. While the genetic basis of rust resistance has been addressed recently, little is known about the physiological aspects
of Eucalyptus–P. psidii interaction. In order to fill this gap, we undertook a study investigating the effects of P. psidii infection on photosynthetic processes of two E. urophylla clones with contrasting resistance to the pathogen. Our results show that gas exchange and chlorophyll a fluorescence parameters were virtually unaffected in the resistant clone. In the susceptible clone, photosynthetic rates
were chiefly constrained by biochemical limitations to carbon fixation. Photosynthesis was impaired only in symptomatic tissues
since the reductions in photosynthetic rates were proportional to the diseased leaf area. Rust infection provoked chronic
photoinhibition to photosynthesis in the susceptible clone. Overall, differences in the ability for light capture, use and
dissipation may play a significant role in explaining the clonal differences in Eucalyptus in response to P. psidii infection. To our knowledge, this is the first report of the effect of rust infection on gas exchange and chlorophyll a fluorescence parameters in Eucalyptus. |
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