Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Screening for efficient cold hardening in a breeding population of Salix using near infrared reflectance spectroscopy. | Ann. For. Sci. 61 2004 449-454 INRA EDP Sciences 2004 DOI forest 2004038 449 Original article Screening for efficient cold hardening in a breeding population of Salix using near infrared reflectance spectroscopy Mattias Lennartsson Erling ỎGREN Umea Plant Science Centre Department of Forest Genetics and Plant Physiology Swedish University of Agricultural Sciences 901 83 Umea Sweden Received 16 June 2003 accepted 28 October 2003 Abstract - The inheritance of cold hardening components - the timing of onset and the inherent rate - was studied in Salix spp. This was achieved by characterising the F2 population of a cross between an early-and-rapidly hardening clone and a late-and-slowly hardening clone. The cold hardiness of stems was estimated using the infrared reflectance spectra of dried and homogenised samples. This method was first calibrated against the freeze test method. The timing of growth cessation was used to determine the onset of cold hardening. In the F2 progeny traits were partly recombined as indicated by the occurrence of clones with early-and-slowly hardening characteristics. The frequency distributions of clones also indicated that the timing of onset and the inherent rate of hardening were independently inherited traits. None of the clones exhibited the desirable late-and-rapidly hardening characteristics combining a long growing period with effective cold hardening. This is not surprising since few F2 clones exhibited late hardening. cold hardiness growth cessation near infrared spectroscopy Salix tree breeding Résumé - Criblage d une population de Salix pour une acclimatation au froid optimale au moyen de la spectroscopie de reflectance en proche infrarouge. La transmission des facteurs d acclimatation au froid - le délai d action et le taux d acclimatation intrinsèque - a été étudiée chez Salix spp. Ceci a été effectué par caractérisation d une population F2 issue d un croisement entre un clone à acclimatation précoce et rapide et un .
