title: Molecular response to water stress in two contrasting Mediterranean pines (Pinus pinaster and Pinus pinea).
abstract: Adaptation to water stress has determined the evolution and diversification of vascular plants. Water stress is forecasted to increase drastically in the next decades in certain regions, such as in the Mediterranean basin. Consequently, a proper knowledge of the response and adaptations to drought stress is essential for the correct management of plant genetic resources. However, most of the advances in the understanding of the molecular response to water stress have been attained in angiosperms, and are not always applicable to gymnosperms. In this work we analyse the transcriptional response of two emblematic Mediterranean pines, Pinus pinaster and Pinus pinea, which show noticeable differences in their performance under water stress. Using microarray analysis, up to 113 genes have been detected as significantly induced by drought in both species. Reliability of expression patterns has been confirmed by RT-PCR. While induced genes with similar profiles in both species can be considered as general candidate genes for the study of drought response in conifers, genes with diverging expression patterns can underpin the differences displayed by these species under water stress. Most promising candidate genes for drought stress response include genes related to carbohydrate metabolism, such as glycosyltransferases or galactosidases, sugar transporters, dehydrins and transcription factors. Additionally, differences in the molecular response to drought and polyethylene-glycol-induced water stress are also discussed.
authors.affiliation: GENFOR Grupo de investigación en Genética y Fisiología Forestal, ETSI Montes, Universidad Politécnica de Madrid, E-28040 Madrid, Spain; Unidad Mixta de Genómica y Ecofisiología Forestal, INIA/UPM, Madrid, Spain.
authors.forename: Pedro
authors.initials: P
authors.lastname: Perdiguero
authors.affiliation: GENFOR Grupo de investigación en Genética y Fisiología Forestal, ETSI Montes, Universidad Politécnica de Madrid, E-28040 Madrid, Spain; Unidad Mixta de Genómica y Ecofisiología Forestal, INIA/UPM, Madrid, Spain.
authors.forename: María Del Carmen
authors.initials: Mdel C
authors.lastname: Barbero
authors.affiliation: GENFOR Grupo de investigación en Genética y Fisiología Forestal, ETSI Montes, Universidad Politécnica de Madrid, E-28040 Madrid, Spain; Unidad Mixta de Genómica y Ecofisiología Forestal, INIA/UPM, Madrid, Spain; Departamento de Ecología y Genética Forestal, CIFOR-INIA, Madrid, Spain.
authors.forename: María Teresa
authors.initials: MT
authors.lastname: Cervera
authors.affiliation: GENFOR Grupo de investigación en Genética y Fisiología Forestal, ETSI Montes, Universidad Politécnica de Madrid, E-28040 Madrid, Spain; Unidad Mixta de Genómica y Ecofisiología Forestal, INIA/UPM, Madrid, Spain.
authors.forename: Carmen
authors.initials: C
authors.lastname: Collada
authors.affiliation: GENFOR Grupo de investigación en Genética y Fisiología Forestal, ETSI Montes, Universidad Politécnica de Madrid, E-28040 Madrid, Spain; Unidad Mixta de Genómica y Ecofisiología Forestal, INIA/UPM, Madrid, Spain. Electronic address: alvaro.soto.deviana@upm.es.
authors.forename: Alvaro
authors.initials: A
authors.lastname: Soto
mesh_terms: D000222:Adaptation, Physiological; D003681:Dehydration; D055864:Droughts; D028223:Pinus / Q000378:metabolism* / Q000502:physiology; D015203:Reproducibility of Results; D020133:Reverse Transcriptase Polymerase Chain Reaction
keywords: Drought; Mediterranean pines; Microarray; RT-PCR