NDLI: Freezing injury in primary and secondary needles of Mediterranean pine species of contrasting ecological niches

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Annals of Forest Science : Volume 66, Issue 3, January 2009

Annals of Forest Science : Volume 66, Issue 2, January 2009

Annals of Forest Science : Volume 66, Issue 1, January 2009

Annals of Forest Science : Volume 65

Annals of Forest Science : Volume 64

Freezing injury in primary and secondary needles of Mediterranean pine species of contrasting ecological niches

Content Provider	Springer Nature Link
Author	Climent, Jose Costa e Silva, Filipe Chambel, M. Regina Pardos, Marta Almeida, M. Helena
Copyright Year	2009
Abstract	• Pine seedlings show a marked ontogenetic difference between primary and secondary needles, the latter prevailing with a different timing among species. • Using the electrolyte leakage method following an artificial freezing test, we aimed at (1) determining the differences in freezing tolerance between primary and secondary needles in eight pines of contrasting thermal habitats: P. canariensis, P. pinea, P. halepensis, P. brutia, P. pinaster, P. nigra, P. sylvestris and P. radiata, (2) evaluating the relation between freezing tolerance and sclerophylly and (3) relating freezing tolerance with the climate of origin. • Primary needles were significantly more sensitive to freezing than secondary needles in Pinus halepensis, P. brutia, P. pinaster and P. nigra, whereas no differences were found in P. canariensis, P. pinea and P. radiata. LT50 was uncorrelated with needle sclerophylly but very highly correlated with the mean temperature of the coldest month at the seed source. • Results support an adaptive role of secondary needles in the mountain Mediterranean pines P. nigra, P. pinaster and P. brutia, while the more complex responses in coastal Mediterranean pines can be interpreted in the light of seedling ontogeny and species’ ecological niches. • Les jeunes plants de pin présentent une nette différence ontogénétique entre aiguilles primaires et secondaires, les secondes devenant dominantes après des délais variables selon les espèces. • À l’aide d’une expérience de gel artificiel et à l’aide de la méthode de perte d’électrolyte, nous avons visé à : (1) déterminer les différences de tolérance au gel entre aiguilles primaires et secondaires de huit espèces de pins présentant des habitats thermiques contrastés : P. canariensis, P. pinea, P. halepensis, P. brutia, P. pinaster, P. nigra, P. sylvestris et P. radiata, (2) évaluer la relation entre tolérance au gel et degré de sclérophyllie, et (3) mettre en relation tolérance au gel et climat d’origine. • Les aiguilles primaires étaient beaucoup plus sensibles au gel que les aiguilles secondaires chez Pinus halepensis, P. brutia, P. pinaster et P. nigra, alors qu’aucune différence n’a été constatée chez P. canariensis, P. pinea et P. radiata. La température induisant 50 % de mortalité n’était pas corrélée avec la sclérophyllie des aiguilles mais très fortement avec la température moyenne du mois le plus froid de la provenance des semences. • Les résultats corroborent l’idée d’un rôle adaptatif des aiguilles secondaires des pins méditerranéens montagnards P. nigra, P. pinaster et P. brutia, tandis que les réponses plus complexes des pins méditerranéens côtiers peuvent être interprétées à la lumière de l’ontogénie des semis et des niches écologiques des espèces.
Starting Page	407
Ending Page	407
Page Count	1
File Format	PDF
ISSN	12864560
Journal	Annals of Forest Science
Volume Number	66
Issue Number	4
e-ISSN	1297966X
Language	French
Publisher	Springer Netherlands
Publisher Date	2009-01-01
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	gel perte d’électrolyte gelée ontogénie hétéroblastie Forestry Wood Science & Technology Forestry Management Tree Biology Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Forestry

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