“…In tulip bulbs there were isolated and characterized 5lipoxygenase (Reddanna et al, 1988) and 9-lipoxygenase (Grechkin et al, 2000). Many studies concerning metabolic processes and changes in levels of some substances possibly associated with cooled tulip bulbs have been published, including changes in polyamine contents (Kollöffel et al, 1992), redistribution of organic nitrogen and carbon (Ohyama et al, 1988;Lambrechts et al, 1992), changes in the content of amino acids in anthers from tulip bulbs (Lukaszewska et al, 1989;Tonecki and Gorin, 1990), starch content and αamylase activity (Gorin and Heidema, 1985;Heidema et al, 1986), chalcones content (Franssen and Kersten, 1992), carbohydrate content (Lambrechts et al, 1994) and invertase activity (Lambrechts and Kollöffel, 1993). Physiological role of lipid metabolism in dormancy and dormancy release in tulip bulbs is unknown.…”