How is ethylene used to induce fruit ripening?

In horticulture, ethylene acts as a vital signaling hormone that triggers and regulates the ripening process in many fruits. When a fruit is exposed to this gas, it initiates a series of physiological changes that transform the produce from a hard, acidic, and green state into a softer, sweeter, and more palatable product.1

Specifically, ethylene exposure facilitates the following changes:
* Chlorophyll Degradation: The green pigments in the fruit are broken down and often replaced by other colors, such as yellow or red.12
* Texture Softening: The fruit becomes softer as enzymes break down substances within the cell wall.12
* Compositional Changes: The fruit experiences a decrease in acidity and an increase in sugar content.12

In agricultural practice, producers may manage ethylene levels to control the timing of market availability. While trapping ethylene—such as in a paper bag—can accelerate ripening, commercial storage often utilizes controlled atmosphere systems to remove the gas, thereby slowing the ripening process and extending the shelf life of perishable crops.12