The invention relates to a detective molecule, and more particularly to a detective molecule and a kit for detecting a target molecule, a method for predicting fragrance production in an orchid, and a method for breeding a scented orchid.本發明係關於一種偵測分子,特別係關於用於偵測一目標分子之一種偵測分子及一種套組,一種預測蘭花香味生產之方法,及一種具香味之蘭花的育種方法。