Bananas give off a gas known as ethylene which makes any other fruits surrounding it to ripen faster and possibly spoil. Keeping bananas separately from other fruit lets them all ripen naturally. However, if you need to ripen fruit quickly, such as peaches that are hard, store a banana together with them. Bananas is best store at room temperature and not in the refrigerator as it dislikes the cold temperature.
** Asian Online Recipes