why ethylene gas causing the fruit to mature?

Ethylene is a plant hormone first in the form of gas. If the fruit is ripe oranges combined with bananas, ripe bananas are faster because oranges emit ethylene gas. The discovery of this hormone in plants first described by R. Gane in 1934.

Ethylene is a plant and cause more rapid maturation in many fruits, including bananas. Ethylene formation requires O2 and is inhibited by CO2. All parts of the plant can produce ethylene gas angiosperms. Formation mainly occurs in roots, shoot apical meristem, mode, fall flowers and ripe fruit.

Ethylene gas has an influence on growth and development, including the following.
1) Ripening fruit. The traders often store the fruit in containers gassed with CO2 at the time of delivery so that the fruit longer to mature and ripen after destination. Sometimes merchants brood ripe fruit with fresh fruit that mature quickly.
2) Gas ethylene inhibits flowering in many plants. However, in some plant species, ethylene stimulates flowering. For example, the mango trees and pineapples.
3) Stimulate abscission (defoliation).
4) Joint gibberellin determine the expression of the genital organs of plants, such as the cucumber.