S11 - Session O4 - Understanding and manipulating cold tolerance - Profiles on abscisic acid, soluble sugars, and glucosinolates metabolites of kimchi cabbage with biostimulants foliar application under extremely high and low temperature condition

Authors: Ha Seon Sim *, Ui Jeong Woo, Won Jun Jo, Hye Jin Lee, Yu Hyun Moon, Soo Bin Jung, Su Ran Ahn, Jung Su Jo, Sung Kyeom Kim

Kimchi cabbage production and price are unstable in spring due to abnormal high temperature (HT) or low temperature (LT) by climate change. This study's objective was to evaluate the biostimulants foliar application affects in Kimchi cabbage during spring through analysis of abscisic acid (ABA), soluble sugars, and glucosinolates metabolites contents. For HT experiments, there are six treatments; three day/night temperature levels (20/16 o C control, 28/24 o C moderate high; MH, and 36/32 o C extreme high; EH) and two levels of chitosan foliar application (200 mg/L; chitosan and non-chitosan). The temperature treatments commenced at 42 days after transplants on the head formation stage and 60 days after transplants on the end growth stage for 8 days. For LT experiments, there are six treatments; three day/night temperature levels (11/-1 o C extreme low; EL, 16/4 o C moderate low; ML, and 21/9 o C control) and two levels of glutamic acid (Glu) foliar application (10 mg/L; Glu and non-Glu). The temperature treatments commenced at 10 days after transplants on the early growth stage for 4 days. Biostimulants were sprayed before temperature treatments, respectively. At 8 days after treatments (DAT) on the head formation stage, the ABA, phaseicacid, dihydrophaseicacid, abscisicacid-glucose ester, glucose, fructose, gluconapin, glucobrassicanapin, glucobrassicin, and 4-methoxyglucobrassicin contents with chitosan were higher than non-chitosan under MH and EH conditions. At DAT 8 on the end growth stage, the dihydrophaseicacid, glucose, fructose, gluconapin, 4-hydroxyglucobrassicin, and 4-methoxyglucobrassicin contents with chitosan were greater than non-chitosan under EH condition. At DAT 4 on the early growth stage, the ABA, phaseicacid, dihydrophaseicacid, sucrose, glucose, and fructose contents with Glu were higher than non-Glu under ML condition. Results indicated that chitosan foliar application was mitigated HT stress under EH condition and Glu foliar application was alleviated LT stress under ML condition. Biostimulants foliar application is feasible to apply a practical cultivation method for stable production of Kimchi material.