I guess that the pollen parent DOES affect the taste, toughness and starchiness of the kernels in the first year!
http://garden.org/learn/articl...
But if your varieties flower on different dates, there won;t be any cross-pollination:
"When one type of corn tassels - letting its pollen loose - that pollen can land on the silks of any corn in the immediate area. If only one variety of corn is silking at any given time, crossing cannot take place. This is usually the case in home gardens, where the varieties planted tend to have significantly different flowering and growing seasons. "
