Provenance variation of Pinus muricata grown in Greece
1996; De Gruyter Open; Volume: 45; Issue: 4 Linguagem: Inglês
ISSN
2509-8934
Autores Tópico(s)Seedling growth and survival studies
ResumoAnalyses of a Pinus radiata experimental plantings, including 18 provenances from the 1978 International Collection (4 from Ano Nuevo, 6 from Monterey, 3 from Cambria and 1 each from Cedros and Guadalupe islands, plus 3 controls), grown at 2 locations in Greece, gave the following results: There are significant differences between provenances in total tree height, diameter at breast height, bark thickness, stem straightness, crown form, number of whorls, number of branches per whorl, branch diameter and resistance to frost. The fastest growing populations were Ano Nuevo and Monterey while Cedros island was the slowest and is completely unadapted to Greek conditions. There is a highly significant correlation between frost resistance and latitude of the provenances and populations (r= 0.80**). An exception is the Guadalupe island population, which although it originates from a low latitude was the most frost resistant in both locations. The natural populations of radiata pine are suffering from inbreeding depression, however, heterosis is released in interpopulation hybrids. The Guadalupe ex Camberra provenance (control) which is a hybrid between Guadalupe and Monterey at the age of 12 years had a mean height at Raches 12.19 m, while the original Guadalupe island population was only 9.83 m. The Guadalupe ex Camberra was also the best at Granitsa planting with mean height at the age of 9 years of 6.56 m, followed by Talaganda seed orchard (control) at 6.27 m. The differences between provenances within populations were insignificant for all characteristics studied, indicating that selection within the best populations (Ano Nuevo and Monterey) can be practiced without a concern at the provenance level.
Referência(s)