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Plants chemistry

Never put bananas into the same basket with apples!

It has been known for a long time, that the presence of a box of apples makes ripen a whole hanger of bananas. It was not known why.

An adrenaline for plants, a gaseous hormone, is ethylene (C₂H₄). Apple trees emit ethylene, when fruits are mellow, orchids - when flowers bloom (and stop emitting when they are emasculated), grapes - when a leaf is broken. How do we know this? Thanks to lasers!

Orchid flowers start to emit ethylene just after being pollinated. In a dry atmosphere this process restarts.

Effect of delayed desiccation on the ethylene production of emasculated Cymbidium flowers. The ethylene production of non-emasculated flowers was low (~0.5 pmol g^-1 h^-1) and showed no significant response to the changing RH). E=time of emasculation.
from: E.J. Woltering and F. Harren, J. Exp. Botany, 40 (1989) 907, with permission