เอทิลีนนอกจากนี้ยังมีการผลิตในปริมาณมาก
Ethylene is also produced in copious amounts
by diseased and injured tissue and mediates the
defense responses of stressed tissue (Ecker and
Davis, 1987; Abeles et al., 1992). In a possible
defense response, carrot and parsnip roots synthesize
bitter tasting phenolic compounds when exposed
to C2H4 in storage. Parsnip roots exposed
to 5 ml l1 C2H4 for 68 days at 1°C developed
higher concentrations of total phenolic compounds
than air stored roots and a bitter offflavor
when cooked (Shattuck et al., 1988).