Corn today is yellow in color although its original color was white. Who turned today's corn the yellow color we find most attractive and what was the first yellow corn called?

When Christopher Columbus and other explorers came to the New World, they found corn growing throughout the Americas, from Chile to Canada. It was consumed both as a vegetable and as a grain in the form of cornmeal seasoned and eaten as an accompaniment to vegetables, fish or meat. The corn that was prized was not just limited to the yellow and white kernel varieties that we know, but many other more popular varieties that featured kernels of red, blue, pink and black and were not only solid, but spotted or striped.

Quoted from:

http://www.whfoods.com/genpage.php?tname=foodspice&dbid=90