The present invention relates to a cotton plant, seed, variety and hybrid. More specifically, the invention relates to a cotton plant having a mutant allele designated OA1 which results in a cotton plant with a Main Stem Load structure when present in either the heterozygous or homozygous state. The invention also relates to crossing cotton plants containing the OA1 mutant allele with cotton plants lacking the OA1 mutant allele to produce novel types of cotton plants.