EDinOH,
I agree that you have some valid concerns there, at least two of them.
Definately possible to introduce disease issues, pathogens via the seed. Most seed sold is from artificial shade grown cultivated plantings where they plant them very thick and spray quite often to control disease.
Absolutely possible for the seed to be contaminated and get to your woodlands when those seeds are planted.
You should treat the seed you purchase with a 10% clorox solution, for about 10 minutes, then rinse it good. That will sure help to eliminate any disease issues on the seed coat.
I treated seed like that last year and I would say that 1/4 to 1/3 of them were cracked and smiling (starting to sprout) and it did no harm to the seed - I had excellent germination from them.
It would be best to buy seed from a \"wild-simulated\" grower if you could. Less disease issues that way, less chance of the seed carrying disease.
But now let me show you something on your concern for \"genetic\" issues. I found the article below while looking around online last year.
Bottom line is that wild ginseng populations are often quite isolated, and basically have very little genetic diversity, and suffer as a result. Mixing with outside sources (like cultivated seed source) actually produces much better plants, larger roots, etc... (acording to the study below).
TNhunter
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Effects of self-pollination and outcrossing with cultivated plants in small natural populations of American ginseng, Panax quinquefolius (Araliaceae)1
Emily H. Mooney and James B. McGraw
West Virginia University, Department of Biology, P.O. Box 6057, Morgantown, West Virginia 26506 USA
ABSTRACT
For rare plants, self-pollination and inbreeding can increase in small populations, while unusual levels of outcrossing can occur through restoration efforts. To study both inbreeding and outcrossing, we performed experimental pollinations using Panax quinquefolius (American ginseng), a wild-harvested plant with a mixed mating system.
For inbreeding, plants were either cross-pollinated within the population or self-pollinated, which resulted in a higher proportion of seeds from self-pollinated flowers.
For outcrossing, wild plants were either cross-pollinated within the population or with cultivated plants from West Virginia or Wisconsin.
Offspring of all crosses were followed for 4 yr.
Two-yr-old seedlings from self-pollination had 45% smaller leaf areas and 33% smaller heights relative to those from cross-pollination. Leaf area is a positive predictor of longer-term survival in wild populations.
Our results suggest inbreeding depression, which is unexpected in this self-fertile species.
Seedlings from crosses with cultivated plants had 127% greater leaf area and 165% greater root biomass relative to outcrosses within the population.
The accelerated growth suggests genetic differences between wild and cultivated populations, but outbreeding depression may not appear until later generations. Assessment of the ultimate fitness consequences of introducing cultivated genotypes requires monitoring over longer time periods.