Effects of moist chilling and solid matrix priming on germination of loblolly pine (Pinus taeda L.) seeds

Loblolly pine ( Pinus taeda L.) seeds from sources with a mild climate unde r maritime influence (North Carolina) required shorter moist chilling to ac hieve maximum germination vigor than seeds from sources with a harsher cont inental climate (Oklahoma). Solid matrix priming (SMP) for 6 d achieved as much as 60 d of moist chilling to improve rapidity, synchrony and completen ess of germination for three of the four families studied. SMP after moist chilling increased the rapidity, synchrony and completeness of germination. The benefit of SMP was greatest for non-stratified seeds and the benefit d ecreased with length of moist chilling. In general, delaying planting for o ne week after SMP had minor effects on germination when seeds were kept in the SMP matrix at 4 degreesC. Delayed planting after SMP can increase germi nation rapidity and synchrony of seeds that have received long moist chilli ng and reduce the benefit of SMP in non-moist-chilled seeds.