In 1876 the Scottish immigrant William Thompson developed the seedless grape we still call the Thompson grape. It had come to be by some natural process, it was a mutant diploid seedless grape growing wild. It was discovered and propagated by humans by grafting cuts onto other rootstocks. Thompson continued grafting until he developed the line that we still use. The same is true of seedless oranges. They are also all graft descendants from one wild, seedless plant.
So all seedless plants are dependant on humans for propagation by alternated means.
Source(s):
http://www.ccmr.cornell.edu/education/as…
Seedless Fruits and Vegetables
http://www.madehow.com/Volume-6/Seedless…
Seedless Fruits and Vegetables
http://www.madehow.com/Volume-6/Seedless…
