2018 ASHS Annual Conference

This study was conducted to determine the variation in phytohormones and sugar contents of Kimchi cabbage as affected by deficit irrigation treatments. Those biochemicals were elucidated in different leaf orders in terms of both non-head and head formation leaf, and each tissue (midrib white and outer green parts). The abscisic acid (ABA) content of Kimchi cabbage which commenced at the 12 days after deficit irrigation (DI) was higher than that of severe DI treated (commenced after 39 days) in all tested leaf orders and tissues. Diphaseic acid contents of non-heading Kimchi cabbage caused by DI treatments were increased 2 times compared with that of control. DI treatment enhanced ABA oxidation in Kimchi cabbage leaves. In DI treatment, hydroxy-ABA (conjugation form) content of head formation leaf with green part was greater than other leaf types and tissues, while those results were opposite in non-head formation leaf. The glucose and fructose contents of non-head formation leaves with DI treatment ranged from 40-60 mg/gDW, which was higher than head formation leaves. The fructan contents of all tested leaf types and tissues were improved by DI treatment. Results indicated that drought or water stress might induce oxidation of ABA metabolites and enhance biosynthesis fructans in Kimchi cabbage leaves. In addition, there was variation in reaction to DI treatment in various leaf types and tissues of Kimchi cabbage. Furthermore, that information can be used to develop practical methods for coping with environmental stresses.