Why are some loofahs bitter?

The reasons why loofah is bitter are as follows:

1, the bitterness of luffa is controlled by genes, and genes can be inherited. If you plant bitter loofah seeds, long loofah is also bitter.

2. In the process of insect pollination, the bitter Luffa plants accepted the bitter Luffa plants' pollen, or the bitter gourd pollen made the Luffa bitter. That is to say, when loofah blooms and pollinates, it causes abnormality and bitterness.