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Germination and phenology of 1-year-old maritime pine seedlings under continuous light

, : Germination and phenology of 1-year-old maritime pine seedlings under continuous light. Trees (Berlin) 7(1): 48-58

Nine half-sib families of maritime pine (Pinus pinaster Ait.), of known vigor and growth pattern (monocyclic vs polycyclic), were grown under continuous light in two temperature regimes. Results of germination and development to the beginning of the second flush are reported here. Families significantly differed for mean date of germination and date of first budset. After 18 weeks of continuous light most of the seedlings had set a bud. High temperature (25 degree C vs 25 degree C/20 degree C) hastened first budset by approximately 5 days. However, 3 families had not reached 75% budset at the end of the experiment. Variation in date of first budset was almost exclusively explained by variation in the period between initiation of primary needles and budset. Further 2, developmental stages could be distinguished within this period, the boundary between them being the emergence of the first secondary needles. Variation in height at first budset was mostly due to variation in growth rate, not in duration. Possible causes of early budset and implication for selection are discussed.

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