Abstract:

In the present work，the effects of nine ectomycorrhizal fungi on the growth of Populus×euramericanacv. ‘NL-895' poplar was investigated. Using HPLC method，the contents of auxin (IAA)，zeatin(Z)，gibberellin (GA) and abscisic acid (ABA) of the filtrate and mycelium of nine ectomycorrhizal fungi cultured in liquid medium were also examined. The results showed that the impacts of nine ectomycorrhizal fungi on the growth of NL-895 poplar were significantly varied. The inoculated seedlings grew better than that without inoculation even if mycorrhiza didn't form. All nine ectomycorrhizal fungi to some extent excreted plant hormones，and the contents in culture filtrate were significantly higher than that of mycelium. There were significant differences among the effects of different hormones on seedling growth. Correlation analysis suggested that the height and stem diameter of seedlings were positively correlated with zeatin contents of mycelium，while the contents of ABA or IAA in the mycelium were negatively correlated with the seedling growth.

Key words: ectomycorrhizal fungi, plant hormone, NL-895 poplar, HPLC