119th General Meeting of the KCS

Type Poster Presentation
Area 생명화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code BIO.P-299
Subject Growth and development of Suaeda glauca through salt-defense mechanisms
Authors 이승재
전북대학교 화학과 , Korea
Abstract High salinity is a major abiotic stress that effects the growth and development of plants. These stresses can influence flowering, production of crops, defense mechanisms and other physiological processes. The halophyte, Suaeda glauca (S. glauca), has many advantages in terms of biomass and saline elimination due to its large mass and well-developed phenotype on seashores, although its mechanistic features and growing specificities still require systematic investigation. Preliminary studies have indicated that secondary metabolites, including alkaloids, are key metabolites for achieving salt tolerance and that indole derivatives retard the inhibition of growth and development in halophytes. Metabolomic studies have validated that indole-3-carboxylic acid (ICA) and indole-3-acetic acid (IAA) accumulate in halophytes under saline conditions. In this study, S. galuca were cultivated under various saline concentrations (0 ̶ 400 mM) in Hoagland’s solution in the absence or presence of indoles to elucidate physiological features via systematic monitoring. The results confirmed that the optimal growth and development ofS. glauca in 50 mM NaCl, and the morphology, such as the number of branches, shoot lengths, and fresh and dry weights, were improved by exogenous ICA treatment. The cation concentrations in roots, shoots and leaves were investigated to examine the ionic imbalance in response to saline treatment, and the results demonstrated that sodium ions accumulated to high concentrations in leaves. The levels of calcium and potassium ions in root were maintained at 50 mM NaCl, an optimal growth condition, but ICA and IAA did not regulate the ion concentrations. This study demonstrates the optimal growth conditions in saline for S. glauca and the phenotypic regulation of ICA, although the ionic imbalance was controlled by genetically programmed physiology. These results will provide valuable information for bioengineering based on the high levels of biomass in S. glauca to achieve salt tolerance in glycophytes and halophytes.
E-mail slee026@jbnu.ac.kr