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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/3721

Title: Comparative transcriptomic profiling of Vitis vinifera under high light using a custom-made array and affymetrix genechip
Authors: Carvalho, Luísa C.
Vilela, Belmiro J.
Mullineaux, Phil M.
Amâncio, Sara
Keywords: quantitative real-time PCR
Vitis vinifera GeneChip
light stress
heat shock proteins
oxidative stress
photo-oxidative stress
Issue Date: Nov-2011
Citation: "Molecular Plant". ISSN 1674-2052. 4:6 (2011) 1038-1051
Abstract: Understanding abiotic stress responses is one of the most important issues in plant research nowadays. Abiotic stress, including excess light, can promote the onset of oxidative stress through the accumulation of reactive oxygen species. Oxidative stress also arises when in vitro propagated plants are exposed to high light upon transfer to ex vitro. To determine whether the underlying pathways activated at the transfer of in vitro grapevine to ex vitro conditions reflect the processes occurring upon light stress, we used Vitis vinifera Affymetrix GeneChip (VvGA) and a custom array of genes responsive to light stress (LSCA) detected by real-time reverse transcriptase PCR (qRT–PCR). When gene-expression profiles were compared, ‘protein metabolism and modification’, ‘signaling’, and ‘anti-oxidative’ genes were more represented in LSCA, while, in VvGA, ‘cell wall metabolism’ and ‘secondary metabolism’ were the categories in which gene expression varied more significantly. The above functional categories confirm previous studies involving other types of abiotic stresses, enhancing the common attributes of abiotic stress defense pathways. The LSCA analysis of our experimental system detected strong response of heat shock genes, particularly the protein rescuing mechanism involving the cooperation of two ATP-dependent chaperone systems, Hsp100 and Hsp70, which showed an unusually late response during the recovery period, of extreme relevance to remove non-functional, potentially harmful polypeptides arising from misfolding, denaturation, or aggregation brought about by stress. The success of LSCA also proves the feasibility of a custommade qRT–PCR approach, particularly for species for which no GeneChip is available and for researchers dealing with a specific and focused problem
Description: Research Article
Peer Reviewed: yes
URI: http://hdl.handle.net/10400.5/3721
ISSN: 1674-2052
Appears in Collections:CBAA - Artigos de Revista

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