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Relation between nitrogen fertilization and the frost resistance of four pine species
Year:2014
Research Areas
  • Plants and animal biology and ecology
Information
Abstract
Low temperature is major environmental factor affecting growth, survival and distribution of plants. A growing body of evidence indicates that nitrogen (N) rich seedlings have higher field performance than poor N plants, due to their higher ability to rapidly produce new roots. Furthermore, N nutrition has an important role in the frost acclimation of pine seedlings that may be related with higher antifreeze protein concentration. We analysed the influence of three N fertilization levels on the frost resistance of four Mediterranean pine species: Pinus halepensis and P. pinea, which live at low lands; P. pinaster, from mid altitude sites; and P. nigra, which mainly thrives in high mountain areas. Seedlings were grown under three N fertilization regimes (high: 150 mg N, low: 20mg N and autumn fertilization: 40mg N+ 60mg N in autumn) for eight months. Frost resistance was measured in November 2012 and in January 2013 by exposing shoots and roots of seedlings to an artificial frost test. Seedling needles damage was assessed by chlorophyll fluorescence while roots damage was determined by electrolyte leakage (EL). Finally all seedlings were assessed by visual evaluation of needle damage (VDI) two months after the frost test. N fertilization significantly improved the frost resistance of all species, specially in shoots, with autumn fertilization stimulating maximum hardening. However, the pattern in roots was not so clear, as the effect of fertilization on frost resistance of roots depended upon test temperature, season and species. Chlorophyll fluorescence and VDI showed similar shoot degree of damage, while only VDI technique in roots, but not EL, allowed a precise discrimination among fertilization and species. In addition, the mountain species P. nigra showed the highest frost resistance, followed by P. pinaster and finally P. pinea and P. hapelensis, which were the most vulnerable to frosts. In conclusions, the geographical distribution of pine species seems to be correlated with low winter temperatures. Our results evidence that this distribution differences might be attributed to differences in pine frost resistance. Also, we evidence that N nutrition, mainly when applied in the autumn enhances seedling frost resistance.
International
Si
Congress
medPINE5- International Conference on Mediterranean pines
960
Place
Solsona
Reviewers
Si
ISBN/ISSN
Start Date
22/09/2014
End Date
26/09/2014
From page
127
To page
127
5th International Conference on Mediterranean Pines (medpine5) Solsona, Spain, September 22-26, 2014 http://medpine5.ctfc.es/
Participants
  • Autor: Andrei Toca (Universidad de Alcalá de Henares)
  • Autor: Judit Maroto De Mercado (UPM)
  • Autor: Juan Antonio Oliet Pala (UPM)
  • Autor: Pedro Villar Salvador (Universidad de Alcalá de Henares)
  • Autor: Rodrigo Martínez Catalán
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Hidrobiología
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