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Strat process for species grown at Webster Nursery

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Strat process for species grown at Webster Nursery

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Includes bleach, H202, and target drydown weights by species

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Percentage of webinar participants practicing the following seed prep techniques

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In response to question during the webinar re: Symphoricarpos albus (snowberry), below is a recent masters thesis on the topic.

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Example of seed moisture content calculations 

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Example of seed moisture content calculations 

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Formulas from talk plugged into spreadsheet for operational use

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Includes article on moisture content monitoring and table of typical strat surface-dry moisture contents by species

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Seeds of Success (SOS) is the national native seed collection program, led by the Bureau of Land Management (BLM)

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See p.18 for research supporting 3% 4-hr soak of H2O2 post-strat that is used for some species by many nurseries

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Further publications about tree seeds in British Columbia:

Tree Seed Working Group Bulletins

Whitebark Pine Publications

Western White Pine Bulletin (PDF)

Seed and Seedling Extension Newsletters (1988 to 2004)

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Further publications about tree seeds in British Columbia: Tree Seed Working Group Bulletins Whitebark Pine Publications Western White Pine Bulletin (PDF) Seed and Seedling Extension Newsletters (1988 to 2004)

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Webster Nursery instructions on using seed spinner to accelerate surface drying process

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Seed Pathogens and Seed Treatments.Littke

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The Stratification-Redry Technique with Special Reference to True Fir Seeds (3)

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This handbook describes the basic principles that govern the biology of forest tree seeds and examines how these principles might apply to reforestation. Its intent is to give an overall picture of how and why seeds may germinate and to provide some understanding of a remarkable process.

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This handbook describes the basic principles that govern the biology of forest tree seeds and examines how these principles might apply to reforestation. Its intent is to give an overall picture of how and why seeds may germinate and to provide some understanding of a remarkable process.

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Practical information about planting and growing North American native plants for conservation, restoration, reforestation, landscaping, highway corridors, and related uses.

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Practical information about planting and growing North American native plants for conservation, restoration, reforestation, landscaping, highway corridors, and related uses.

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University of Wisconsin Press COVID-19 Statement

If you are unable to access journal content that would normally be made available to you by your library or institution, please contact us at journals{at}uwpress.wisc.edu and we will make sure you get the content you need.

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If you are unable to access journal content that would normally be made available to you by your library or institution, please contact us at journals{at}uwpress.wisc.edu and we will make sure you get the content you need.

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A review of techniques to improve cold stratification for tree and shrub species

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A review of techniques to improve cold stratification for tree and shrub species

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Advanced Techniques to Prepare Seed to Sow.Karrfalt.2013

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Pre-strat bleach, post-strat H202 and other treatments to knock down Fusarium levels on Douglas-fir

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Pre-strat bleach, post-strat H202 and other treatments to knock down Fusarium levels on Douglas-fir

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Effects on Seed Germination and Seedborne Organisms

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Using bleach to pre-treat some conifer seeds

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Using bleach to pre-treat some conifer seeds

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Germination of Conifer Seeds Surface-Sterilized With Bleach

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May 2020 issue of TSWG News Bulletin- Topic is Seed Preparation

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May 2020 issue of TSWG News Bulletin- Topic is Seed Preparation

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Includes articles on thermal priming and extended strat

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Abstract

Temperate conifer seeds are often considered to be shallowly dormant because a dormancy breakage treatment such as incubation of moist seeds at 4°C (prechilling) for 3-6 weeks improves germination. However, longer prechill durations can induce germination during the cold phase. Since the delicate radicles of prematurely germinated seeds are easily damaged and killed during sowing, potential benefits of extended prechilling are unknown.

Described here for the first time is a target moisture content (TMC) prechill. In this dormancy breakage method the seeds are chilled at moisture contents high enough for removal of dormancy but low enough to produce surface dry, free flowing seeds that do not germinate during chilling. The method is a simple, effective and practical way to restrict the amount of water available to seeds from the start of a prechill treatment. The TMC prechill was applied to three conifer species, Douglas fir ( Pseudotsuga menziesii (Mirbel) Franco), Lodgepole pine ( Pinus contorta Douglas), and Sitka spruce ( Picea sitchensis (Bongard) Carrière). All three species benefited from the TMC prechill. Extending the prechill period progressively improved germination by widening the range of temperatures over which germination occurred, raising germination capacity at most temperatures and increasing germination rate at all temperatures. The optimum prechill period combining high germination capacity and low mean germination time was 36 weeks for Douglas fir, from 36 to 76 weeks for Lodgepole pine and 36 or 76 weeks for Sitka spruce depending on incubation temperature. None of the seeds of any of the species germinated during the TMC prechill of up to 76 weeks at 4°C.

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References

1. Bergsten, U. 1987. Incubation of Pinus sylvestris L. and Picea abies (L.) Karst. seeds at controlled moisture content as an invigoration step in the IDS method. Dissert. Swedish University of Agricultural Sciences, Department of Silviculture, Umeå. 98 pp.

Google Scholar

2. International Seed Testing Association 1985. International rules for seed testing 1985. Seed Sci. and Technol. 13: 299-355.

Google Scholar

3. Jones, S. K., Bergsten, U. and Gosling, P. G. 1993. A comparison of 5°C and 15°C as dormancy breakage treatments for Sitka spruce ( Picea sitchensis). In: Dormancy and barriers to germination, Edwards, D. G. W. (compiler and editor). Proc. Internat. Sympos. IUFRO Project Group P2.04-00 (Seed Problems). Victoria, British Columbia, Canada, April 23-26, 1991: 51-55.

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Author information

Affiliations

Plant Production Branch, Forest Research Station, Alice Holt Lodge, Wrecclesham, GU10 4LH, Farnham, Surrey, UK

S. K. Jones & P. G. Gosling

Additional information

This work is Crown copyright, reproduced by Kluwer Academic Publishers by permission of the Forestry Commission.

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"Target moisture content" prechill overcomes the dormancy of temperate conifer seeds

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Temperate conifer seeds are often considered to be shallowly dormant because a dormancy breakage treatment such as incubation of moist seeds at 4°C (prechilling) for 3-6 weeks improves germination. However, longer prechill durations can induce germination during the cold phase.

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A 2008 update of the Seed of Woody Plants in the United States manual which was published in 1974. 

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A 2008 update of the Seed of Woody Plants in the United States manual which was published in 1974. 

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This publication from the BC Ministry of Forests describes the anatomical and morphological characteristics of conifer seeds as well as germination, dormancy, and seed tests. In addition, eight conifer genera are profiled.

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This publication from the BC Ministry of Forests describes the anatomical and morphological characteristics of conifer seeds as well as germination, dormancy, and seed tests. In addition, eight conifer genera are profiled.

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The primary national strategic resource for forest ecosystem seed science and technology. 

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The primary national strategic resource for forest ecosystem seed science and technology. 

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Native plant protocol development, seed tech transfer, genetic conservation, seed testing services, international work

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WELCOME

Most native plants used for ecosystem conservation and restoration are propagated exclusively from seeds. Sufficient quantities of seeds are needed to restore and sustain native plant communities that are increasingly affected by invasive species, pest infestations, wildfire, and climate change. The National Seed Laboratory (NSL) is currently addressing these complex challenges and is serving as the primary national strategic resource for forest ecosystem seed science and technology.

Native Plant Protocol Development - Protocol development for seed handling, germination and storage of a wide range of native plant seeds. more plant protocol development

Training and Technology Transfer - Provides training materials, workshops, and customized individual training programs and collaborates with research and production facilities nationwide. more training technology transfer

Genetic Conservation - Some native plant species are at risk due to insects, disease, invasive weeds, overuse by humans, and/or inherent biology. Seeds, from these species, can be conserved for decades. Samples are provided for domestic and international research and sample data is maintained in an internet accessible data base. more genetic conservation

International Work -Certification of seed quality and genetic identity is needed for seeds traded between countries. NSL represents the US government at the Forest Reproductive Materials Scheme of the Organization of Economic Cooperation and Development. more international work

Seed Testing Services - Seed tests results are used in forest and conservation nurseries to make efficient use of seeds, to evaluate seed quality in processing plants and as the basis for seed price determination. more seed testing services

UP Front

Longleaf Pine Cone Maturity
Laughing All the Way to the Seed Bank National Native Seed Conference PowerPoint Files Restoring Damaged Lands

https://www.fs.usda.gov/nsl/

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National Seed Laboratory - USDA Forest Service

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WELCOME Most native plants used for ecosystem conservation and restoration are propagated exclusively from seeds. Sufficient quantities of seeds are needed to restore and sustain native plant communities that are increasingly affected by invasive species, pest infestations, wildfire, and climate change.

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Tree Seed Working Group News Bulletin links to Volumes 1-68

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Tree Seed Working Group News Bulletin links to Volumes 1-68

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Bi-annual publication with roughly 300 members, mostly from Canada and some from the US and elsewhere. Each issue
features a production-oriented topic.

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The Canadian Forest Genetics Association (CFGA) has a Tree Seed Working Group (TSWG) that has been active since 1983.

The group publishes a news bulletin on a selected theme biannually. About 300 people currently receive the news bulletin. Members are mainly from Canada, but there are some from the United States, Europe and a handful of other countries.

The Tree Seed Working Group also hosts a Tree Seed Workshop at the biennial CFGA meeting.

Objectives

The Tree Seed Working Group has four objectives on promoting tree seed science and technology through

Seed research from bud initiation to seed use

Identification of seed problems relating to tree improvement and forest management

Exchange of information on seed related problems

Advising on implementation practices

Tree Seed Working Group News Bulletins

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The Canadian Forest Genetics Association (CFGA) has a Tree Seed Working Group (TSWG) that has been active since 1983. The group publishes a news bulletin on a selected theme biannually. About 300 people currently receive the news bulletin. Members are mainly from Canada, but there are some from the United States, Europe and a handful of other countries.

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Carole Leadem

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Reforestation, Nurseries and Genetic Resources = rngr.net

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Reforestation, Nurseries and Genetic Resources = rngr.net

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To supply people who grow forest and conservation seedlings with the very latest technical information.

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Fredericton, New Brunswick, Canada
August 1 st - August 3 rd

For more information, click here.

Moscow, ID
September 6 th - September 7 th

For more information, click here.

Portland, OR
September 19 th - September 21 st

For more information, click here.

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Reforestation, Nurseries and Genetics Resources

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Fredericton, New Brunswick, Canada August 1 st - August 3 rd For more information, click here. Moscow, ID September 6 th - September 7 th For more information, click here. Portland, OR September 19 th - September 21 st For more information, click here.

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This guidebook, published by the BC Ministry of Forests, covers seed condition, cone and seed insects, seed fungi as well as an in-depth coverage of the seed handling system from cone collection to sowing in the nursery. An additional section on the germination micro-environment and its manipulation is also included.

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This guidebook, published by the BC Ministry of Forests, covers seed condition, cone and seed insects, seed fungi as well as an in-depth coverage of the seed handling system from cone collection to sowing in the nursery. An additional section on the germination micro-environment and its manipulation is also included.

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BC Ministry of Forests Seed Handling Guidebook

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Links to seed manuals, some of which are below

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This manual is intended primarily to train seed collectors, seed-plant managers, seed analysts, and nursery managers, but it can serve as a resource for any training course in forest regeneration. It includes both temperate and tropical tree species of all intended uses.