Effects of Late Summer Photoperiod Upon Some Aspects of the Physiology of Seedlings of Several Boreal Species

1990

S. 93-100

5 Tab., 13 Lit. Ang.

Unselbständiges Werk

200085781

First year seedlings of white spruce (Picea glauca (Moench.) Voss), black spruce (Picea mariana (Mill.) B.S.P.), lodgepole pine (Pinus contorta Dougl. and jack Pine (Pinus banksiana Lamb.) were grown nder either sixteen hour, natural, or eight hour photoperiods during the month of August. Both prior to and after the photoperiod treatments, all conducted under ambient temperatures in the Vancouver area, seedlings were grown under ambient photoperiods and temperatures. Exposure to short photoperiods generally increased seedling cold hardiness and field survival after outplanting in mid-October, but abscisic acid (Aba) content varied with species and treatment.