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Practical Considerations for Increasing Seed Samples of Wild Species

  • Barbara C. HellierEmail author
Chapter

Abstract

Wild species and crop wild relative samples whether for a gene bank or restoration need to be increased or replenished if original sample sizes are small, quantities have decreased with distribution and use, or viability has declined. An ideal source for fresh seed of wild species is from the original collection population. If re-collection is not possible, then ex situ increase is needed. The goal for seed increase is to maintain the genetic integrity of the original sample and produce high-quality seed. This is a challenge when growing crop species and even more of a challenge for wild species because of heterogeneity within accessions, increased seed dormancy, increased seed shattering, low seed production, indeterminant flowering and seed set, and little information on pollination biology or cultural needs. Preventing genetic drift and natural selection are two key components to maintaining genetic diversity during seed increase. A large effective population in increase plots, balanced sampling, and breaking seed dormancy are important for limiting genetic drift. Providing appropriate pollination and cultural conditions for wild species is important to impede natural selection. Seed growers can glean clues to breaking seed dormancy and the cultural needs of a species from accession passport data. Diligent attention to detail must be taken to prevent contamination between and among accessions being increased and to prevent physical damage to the seed produced through all the steps of seed production.

Keywords

Seed dormancy Genetic drift Elymus Seed production Ex situ Wild species 

Notes

Acknowledgments

The author would like to thank Annette Miller, USDA ARS National Laboratory for Genetic Resources Preservation, Plant Germplasm Resources Preservation Program, Fort Collins, CO, for compiling the information in Table 11.1 and Stephanie Greene, Vicki Bradley, Susan Stieve, and Gail Eckwright for their thoughtful reviews of the chapter.

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Copyright information

© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2018

Authors and Affiliations

  1. 1.US Department of Agriculture – Agricultural Research Service, Plant Germplasm Introduction and Testing Research UnitWashington State UniversityPullmanUSA

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