Growth-promoting Sphingomonas paucimobilis ZJSH1 associated with Dendrobium officinale through phytohormone production and nitrogen fixation.
Bottom Line: Growth-promoting Sphingomonas paucimobilis ZJSH1, associated with Dendrobium officinale, a traditional Chinese medicinal plant, was characterized.Using high-performance liquid chromatography-mass spectrometry, strain ZJSH1 was found to produce various phytohormones, including salicylic acid (SA), indole-3-acetic acid (IAA), Zeatin and abscisic acid (ABA).Accordingly, much higher contents of SA, ABA, IAA and c-ZR were detected in the inoculated seedlings, which may play roles as both phytohormones and 'Systemic Acquired Resistance' drivers.
Affiliation: College of Life Science, Zhejiang Sci-Tech University, Road 2, Hangzhou, China.Show MeSH
Related in: MedlinePlus
Mentions: To determine the exact contribution of strain ZJSH1 on the phytohormone production in the inoculated plants, the phytohormone concentration was analysed in the inoculated seedlings. First, the population dynamics of strain ZJSH1 in the seedlings were investigated. As shown in Fig. 3A, the highest population was found within and on the surface of the roots, followed by the stems, and then the leaf samples. During the 90 days growth period of the study, the population of strain ZJSH1 increased continuously during 45–60 days, with a constant population then maintained for the remaining time. The population remained at about 104 CFU g−1 in roots, at about 103 CFU g−1 in stems and at about 102 CFU g−1 in leaves. Therefore, the phytohormone content was accordingly determined at the 30, 60 and 90 days post-inoculation periods (Table S2).
Affiliation: College of Life Science, Zhejiang Sci-Tech University, Road 2, Hangzhou, China.