Germination and seedling growth in Abies lasiocarpa (Hook.) Nutt. as affected by provenance, seed pretreatment, and temperature regime
1990
Hansen, O.B. (Norges Landbrukshoegskole, Aas (Norway). Inst. for Plantekultur) | Leivsson, T.G.
Abies lasiocarpa (Hook.) Nutt. seeds germinated and the seedlings grew on under controlled environments (18 h photoperiod and 16/8 h thermoperiods; 10/10 deg C, 20/20 deg C, 20/10 deg C, and 25/10 deg C). The experiment was concluded after 180 days, and the seedlings were scored for stem diameter and length. Four provenances were included: Colorado 'high elevation' (CO), Oregon 1600 m a.s.l. (OR), British Columbia 1200 m a.s.l. (BC), and Finland (BCF; originally from British Columbia 1800 m a.s.l.). A cold-moist pretreatment for 30 days improved germination and seedling growth in the BC and BCF seed lots, while the CO and OR seed lots were less affected. Daily fluctuating temperatures improved germination in the BC and BCF seed lots, the widest fluctuation 25/10 deg C producing the greatest germination. The average length of the seedlings was 34 mm at 20/20 deg C, 33 mm at 20/10 deg C and 37 mm at 25/10 deg C; differences in hypocotyl length being most important. There were small but significant differences between the provenances in their reaction to temperature regime. The major part of the seedlings produced 2 or 3 flushes of growth in the 180 days period, the CO provenance having the most stabile buds and the OR provenance being the most labile.
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