α -Naphthylacetic acid (NAA) is a broad-spectrum plant growth regulator. It has the feature and function of inner auxin 3- indolebutyric acid which can accelerate the division and enlargement. It can be absorbed via root, stem or leaf. It is widely used in agriculture, forestry, vegetable, flower, fruit etc. It can induce formation of adventitious root, improve cutting culture, promote fruit set, and prevent pre-maturation of fruit.
