title: Fungal diversity and plant growth promotion of endophytic fungi from six halophytes in Suncheon Bay.
abstract: Endophytic fungi were isolated from roots of six halophytes in Suncheon Bay. The endophytic fungi of 35 species isolated from halophytes were identified by internal transcribed spacer (ITS) containing the ITS1, 5.8s, and ITS2 regions. All fungal strains were analyzed to diversity at the genus level. Fungal culture filtrates (FCF) of endophytic fungi were treated to Waito-c rice (WR) seedling for plant growth-promoting verification. It was confirmed that fungal strain Sj-2-2 provided plant growth promotion (PGP) to WR seedling. Then, PGP of Suaeda japonica was confirmed by treating culture filtrate of Sj-2-2. As a result, it was verified that culture filtrate of Sj-2-2 had more advanced PGP than positive control when treated to S. japonica. The secondary metabolites involved in culture filtrate of Sj-2-2 were identified by HPLC and GC-MS SIM analysis. The presence of physiologically bioactive gibberellins (GAs) and other inactive GAs in culture filtrate of Sj-2-2 was detected. The molecular analysis of sequences of Sj-2-2 showed the similarity to Penicillium sp. of 99% homology. The PGP of Sj-2-2 as well as symbiosis between endophytic fungi and halophytes growing naturally in salt marsh was confirmed. Sj-2-2 was identified as a new fungal strain producing GAs by molecular analysis of sequences. Consequently, the Sj-2-2 fungal strain was named as Penicillium sp. Sj-2-2. In this study, the diversity of endophytic fungi isolated from roots of halophytes in salt marsh and the PGP of a new gibberellin-producing fungal strain were confirmed.
authors.affiliation: Department of Life Sciences and Biotechnology, Kyungpook National University, Daegu 702-701, Republic of Korea.
authors.forename: Young-Hyun
authors.initials: YH
authors.lastname: You
authors.forename: Hyeokjun
authors.initials: H
authors.lastname: Yoon
authors.forename: Sang-Mo
authors.initials: SM
authors.lastname: Kang
authors.forename: Jae-Ho
authors.initials: JH
authors.lastname: Shin
authors.forename: Yeon-Sik
authors.initials: YS
authors.lastname: Choo
authors.forename: In-Jung
authors.initials: IJ
authors.lastname: Lee
authors.forename: Jin-Man
authors.initials: JM
authors.lastname: Lee
authors.forename: Jong-Guk
authors.initials: JG
authors.lastname: Kim
mesh_terms: D044822:Biodiversity; D060026:Endophytes / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D005658:Fungi / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D005875:Gibberellins / Q000378:metabolism; D008969:Molecular Sequence Data; D012275:Oryza / Q000254:growth & development* / Q000382:microbiology; D010802:Phylogeny; D010937:Plant Growth Regulators / Q000378:metabolism; D018517:Plant Roots; D056910:Republic of Korea; D055051:Salt-Tolerant Plants / Q000382:microbiology*; D013559:Symbiosis
chemical_list: D005875:Gibberellins; D010937:Plant Growth Regulators