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Influence of moisture loss during storage on new growth of conifer seedlings.

Lefevre, R. E.; Cameron, A. C.; Peterson, N. C.;

Journal of Environmental Horticulture Year: 1991 Vol: 9 Issue: 2 Pages: 92-96 Ref: 17 ref.

1991

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Influence of moisture loss during storage on new growth of conifer seedlings.

The relationship between moisture loss from bare-root 2-year-old seedlings of Picea pungens var. glauca (cultivars Misty Blue and San Juan) and % survival and performance after extended storage at 0 deg C was investigated. Moisture loss was examined by determining % weight loss and moisture content during postharvest handling and storage. To generate different levels of moisture loss, San Juan seedlings were stored in various packing materials that differed in water permeability for 0 or 1 day at 20 deg prior to 5 or 7 months of storage at 0 deg . Depending on treatment, weight loss of seedlings varied from 0 to 60% and seedling survival ranged from 0 to 100%. When weight loss was 25% all bare-root seedlings survived 5 and 7 months of storage. Seedlings expressed a great degree of tolerance to desiccation stress, as demonstrated by those few which survived nearly 60% weight loss. At weight losses of between 20 and 40% there was no direct relationship between moisture loss and survival. Bare-root seedlings grew with 100% survival following 5 and 7 months of storage at 0 deg if packaged in either unsealed perforated or non-perforated polyethylene film.