The new grapefruit ‘；TR-1’； is provided. The variety is produced from a mutation of ‘；Rio Red’； grapefruit, which can be distinguished by its outstanding features. TR-1 is a red grapefruit variety originated as a budsport mutation from Rio Red grapefruit and differentiating from the Rio Red grapefruit by a Red external color contrasting to the yellow with red blush from Rio Red grapefruit. The internal color is red with milder flavor reduced bitter taste.
