Which factor is least likely to contribute to ethylene build-up in a cooler for flower storage?

Ethylene is a plant hormone that plays a critical role in the ripening and aging of flowers and other plant materials. When stored in coolers, the accumulation of ethylene gas can negatively impact the quality and longevity of floral products. Various factors can contribute to the build-up of ethylene, but gas leaks, as mentioned in the correct answer, are least likely to be a direct factor.

Humidity levels can influence ethylene production because higher moisture can promote conditions under which ethylene-producing processes (such as decay) may occur. Temperature fluctuations can also exacerbate ethylene build-up since warmer temperatures can enhance the respiration rates of flowers, leading to more ethylene production. Similarly, the presence of ripening fruits is a well-known source of ethylene, as they release this gas as they ripen, leading to quicker aging and deteriorating conditions for nearby flowers.

In contrast, gas leaks do not contribute to ethylene production in the same way that the other factors do. While leaks could introduce air or other gases that may alter the overall environment, they do not inherently produce ethylene. Therefore, this factor stands out as the least likely to contribute to ethylene build-up in a cooler used for storing flowers.