CONICET | Buscador de Institutos y Recursos Humanos

Conferencia; Adaptation of Forest and Forest Management to changing climate with emphasis on forest helth: a review of science, policies and practices; 2008

Institución organizadora:

IUFRO (International Union of Forest Research Organizations); FAO and SLU (Swedish University of Agricultural Sciences)

Resumen:

RESPONSES TO FLOODING OF POPLAR CLONES PLANTED IN THE PARANÁ RIVER DELTA, ARGENTINA V.M.C. Luquez1,2; F. G. Achinelli1,3, S. Cortizo5, J.J. Guiamét1,4 1: Instituto de Fisiología Vegetal (INFIVE), CC 327, CP 1900, La Plata, Argentina. 2: Corresponding author, vluquez@agro.unlp.edu.ar 3: fachinel@yahoo.com.ar 4: jguiamet@museo.fcnym.unlp.edu.ar 5: INTA Delta, Río Paraná de Las Palmas y Canal Laurentino Comas, CP 2804, Campana, Argentina. scortizo@correo.inta.gov.ar The Paraná River Delta is already experiencing the consequences of climate change. Rainfall has increased in the area from 1970 onwards, and extreme rain events (more than 150 mm of rainfall in two days) are now more frequent, increasing the risk of flooding. Forestry is the main economic activity in this area, with most part of poplar (Populus spp) plantations in Argentina located there. Therefore, genotypes with increased tolerance to flooding will be needed for the area. The aims of this work were: (1) To identify clones tolerant to flooding as suitable parents for breeding programmes to increase flood resistance; (2) To select extremes of flood tolerance for physiological and molecular studies to gain a better understanding of flooding tolerance mechanisms in poplar. We analyzed the responses to flooding of 14 poplar clones (Populus deltoides and Populus x canadensis) growing in pots in a greenhouse. Some are commercial clones planted in the area, and others belong to a poplar breeding programme from INTA (Argentina´s National Institute for Agricultural Technology). Plants of approximately 60 cm height were watered (control) or submerged in water covering 10 cm above soil level (flooding treatment) for 35 days. The first symptoms of stress appeared after two weeks. Flooding reduced growth in height and diameter, photosynthesis, stomatal conductance, total leaf area and the number and area of newly formed leaves. In some clones, flooding accelerated leaf senescence and abscission of basal leaves, and induced the development of hypertrophied lenticels and adventitious roots. A hierarchical cluster analysis was performed to classify the responses of the clones to flooding. Clones with different degrees of tolerance were identified, and will be used for future physiological, molecular and genetic studies of flood tolerance in poplar. Key words: flooding, growth, Paraná River Delta, poplar. ID-050