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Evol Appl. 2008 Nov;1(4):587-97. doi: 10.1111/j.1752-4571.2008.00045.x. Epub 2008 Sep 04.

Seed supply for broadscale restoration: maximizing evolutionary potential.

Evolutionary applications

Linda M Broadhurst, Andrew Lowe, David J Coates, Saul A Cunningham, Maurice McDonald, Peter A Vesk, Colin Yates

Affiliations

  1. CSIRO Plant Industry Canberra, ACT, Australia.
  2. Ecology & Evolutionary Biology, The University of Adelaide Adelaide, SA, Australia.
  3. Department of Environment and Conservation, Bentley Delivery Centre WA, Australia.
  4. CSIRO Entomology Canberra, ACT, Australia.
  5. CSIRO Centre for Environment and Life Sciences Wembley, WA, Australia.
  6. School of Botany, The University of Melbourne Parkerville, VIC, Australia.

PMID: 25567799 PMCID: PMC3352390 DOI: 10.1111/j.1752-4571.2008.00045.x

Abstract

Restoring degraded land to combat environmental degradation requires the collection of vast quantities of germplasm (seed). Sourcing this material raises questions related to provenance selection, seed quality and harvest sustainability. Restoration guidelines strongly recommend using local sources to maximize local adaptation and prevent outbreeding depression, but in highly modified landscapes this restricts collection to small remnants where limited, poor quality seed is available, and where harvesting impacts may be high. We review three principles guiding the sourcing of restoration germplasm: (i) the appropriateness of using 'local' seed, (ii) sample sizes and population characteristics required to capture sufficient genetic diversity to establish self-sustaining populations and (iii) the impact of over-harvesting source populations. We review these topics by examining current collection guidelines and the evidence supporting these, then we consider if the guidelines can be improved and the consequences of not doing so. We find that the emphasis on local seed sourcing will, in many cases, lead to poor restoration outcomes, particularly at broad geographic scales. We suggest that seed sourcing should concentrate less on local collection and more on capturing high quality and genetically diverse seed to maximize the adaptive potential of restoration efforts to current and future environmental change.

Keywords: evolutionary potential; genetic diversity; germplasm; provenance; restoration; seed quality

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