Abstract: To investigate the effects of lipoxygenase (LOX-1) on the cormels formation and enlargement in Gladiolus hybridus, with 'Rose Supreme' and 'Advanced Red' as materials, LOX-1 activity, endogenous methyl jasmonate (MJ), sucrose, starch and cellulose contents were examined during the cormels growth. The results showed that LOX-1 activity and endogenous MJ content in 'Rose Supreme' were higher than those in 'Advanced Red', with highest activties and contents in stolons, but not detected in leaves. It suggested that LOX-1 might regulate the development and growth of Gladiolus cormels through affecting the JAs biosynthesis cycles. During the cormels growth, the contents of sucrose, starch and cellulose, with positive correlations with LOX-1 activity, showed different increase in corm and cormels, which also suggested that sucrose, starch and cellulose played important roles in the formation and enlargement of gladiolus corms and cormels.

Key words: Gladiolus hybridus, cormel, lipoxygenase, methyl jasmonate, carbohydrate