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Papaya is botanically known as Carica papaya L. It belongs to Caricaceae family and it has chromosome number is 2n=18. Papaya is native to Tropical America. It was introduced in the 16th century in India. The term ‘Plant Growth Regulators’ is relatively new in use. In previous literature, these were revealed as Hormones. “Hormone” is a Greek word derived from “hormao” which means to stimulate. Thimonn (1948) optional the use of the term phytohormons in place of hormone of plants. He defined phytohormons as the organic substances which are formed naturally in plants, synthesized in one part and usually trans-located to other part of plants where in every small quantity effect on the growth and other physiological activates of the plants. The term growth regulator is used for the materials which work similar to phytohormons but synthetic in nature.

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