Lu-Min Vaario, Kim Yrjälä, Matti Rousi, Timo Sipilä, Pertti Pulkkinen. (2011). Leaf number indicates salt tolerance of young seedling families of European aspen (Populus tremula L.) growing in different soils. Silva Fennica vol. 45 no. 1 article id 28. https://doi.org/10.14214/sf.28

Keywords: leaf number; Populus tremula; root; shoot ratio; salt tolerance

Abstract | View details | Full text in PDF | Author Info

Soil salinity limits plant productivity and quality. We evaluated the response of 12 aspen (Populus tremula) families to salt stress in two different soils irrigated for 4-weeks with 0, 80 or 160 mM saline solution. Easily measurable characteristics such as shoot height, leaf number, dry mass as well as the distribution of sodium (Na⁺) ions were measured in 5-month-old aspen seedlings raised in controlled greenhouse conditions on two different soils. Growth among families varied significantly, and the interaction between family and soil type was significant. From 2–5 months, leaf number correlated with that of the first month and salinity tolerance. Sodium ions varied significantly within plants and among families; seedlings that accumulated higher Na⁺ concentrations in root had more leaves and lower Na⁺ in shoot. These results suggest that leaf number indicates salt tolerance in young seedlings. Seedling performance was also affected by soil type, especially the root/shoot ratio, suggesting an interaction between salt tolerance and growth medium. This study has identified significant intra-specific variation in salt tolerance of aspen in 160 mM saline and highlighted the potential to select and develop a method for efficient pre-screening of trees to be used in the reclamation of salt-affected land.

Vaario, Finnish Forest Research Institute, Vantaa Research Unit, P. O. Box 18, FI-01301 Vantaa, Finland E-mail: lu-min.vaario@metla.fi
Yrjälä, MEM group, Department of Biosciences, P.O. Box 56, FI-00014 University of Helsinki, Finland E-mail: ky@nn.fi
Rousi, Finnish Forest Research Institute, Vantaa Research Unit, P. O. Box 18, FI-01301 Vantaa, Finland E-mail: matti.rousi@metla.fi
Sipilä, Department of Agricultural Sciences, P.O. Box 56, FI-00014 University of Helsinki, Finland E-mail: ts@nn.fi
Pulkkinen, Pulkkinen, Finnish Forest Research Institute, Haapastensyrjä Research Unit, Haapastensyrjäntie 34, FI-12600 Läyliäinen, Finland E-mail: pertti.pulkkinen@metla.fi

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