Simulating pollen flow and field sampling constraints helps revise seed sampling recommendations for conserving...

Area of Science:

• Genetics
• Conservation Biology
• Population Genetics

Background:

• Seed collections are crucial for ex situ conservation.
• Understanding factors influencing genetic diversity within these collections is vital for their long-term success.

Purpose of the Study:

• To investigate the influence of pollen flow and sampling strategies on genetic conservation in seed collections using simulations.

Main Methods:

• Simulated genotypes of parental individuals and performed crosses under varying pollen flow conditions (panmictic, limited, highly limited).
• Modeled diverse seed sampling scenarios, including realistic and ideal (uniform) approaches.
• Calculated the proportion of alleles conserved under each simulation parameter.

Main Results:

• Panmictic pollen flow yielded seed sets with substantially more conserved alleles (21.6% more than limited, 48.6% more than highly limited).
• The impact of pollen flow on allele conservation decreased when a large number of maternal plants were sampled.
• Realistic seed sampling methods had a minor impact (<2.5%) on genetic diversity compared to ideal uniform sampling.

Conclusions:

• Limited pollen flow is a critical factor to consider in future seed collection guidelines.
• Flexible field sampling is feasible provided a high number of unique maternal plants are included.
• Simulations are valuable tools for developing and refining ex situ sampling strategies.