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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/3864

Title: Molecular responses of Coffea spp. tolerance to low non-freezing temperatures
Authors: Santos, Paula Cristina Bento Batista dos
Advisor: Ribeiro, Ana Isabel Faria
Chaves, Maria Manuela
Keywords: Coffea
antioxidative molecules
cold
photosynthesis
chloroplast membrane lipids
gene expression
Issue Date: 2010
Publisher: ISA/UTL
Citation: Santos, Paula Cristina Bento Batista dos - Molecular responses of Coffea spp. tolerance to low non-freezing temperatures. Lisboa: ISA, 2010
Abstract: Low positive temperatures are of up most importance in tropical plant species, namely in Coffea spp., disturbing plant growth and metabolism, with impact on photosynthesis and yield. An integrated biochemical and molecular approach was used to analyze the cold impact and tolerance ability on photosynthesis of coffee plants, linked to modifications of the status of the antioxidative system, and chloroplast membrane lipids. Five coffee genotypes with contrasting cold sensitivity were used: Coffea canephora cv. Apoatã, C. arabica cv. Catuaí, C. dewevrei, Icatu (C. arabica x C. canephora) and Piatã (C. dewevrei x C. arabica). Determinations were performed along a slow cold imposition (to allow acclimation) from 25/20 ºC (day/night) down to 13/8 ºC, after exposure to 4o C (chilling) and in the rewarming period thereafter. Cold exposure strongly affected net photosynthesis in all genotypes, although stomatal limitations were not detected. Icatu revealed the lowest leaf loss, higher reinforcement of the antioxidative system, qualitative changes in chloroplast membrane lipids and regulation of some key genes. Altogether these responses indicate a better ability of this genotype to cope with low positive temperatures
Description: Doutoramento em Biologia - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/3864
Appears in Collections:BISA - Teses de Doutoramento / Doctoral Thesis

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