CAJ | 학술논문

Pinus koraiensis seedlings were used as experimental material to study the effects of rare earth elements La and Eu on the growth,polyphenols contents and PAL,C4H activities of P. koraiensis seedlings. The results showed that rare earth elements La and Eu could significantly promote the growth and increase the polyphenols contents of P. koraiensis seedlings. The optimum concentrations of La3 + and Eu3 + were 400 μmol·L -1 and 100 μmol·L -1 ,respectively. With the concentrations,the polyphenols contents and were 1. 55 and 1. 39 times higher,and the proanthocyanidins contents were 1. 58 and 1. 40 times higher than the control group,respectively. The PAL and C4H activities significantly increased and peaked in two days after the induction with 100 μmol · L -1 La3 + and 400 μmol·L -1 Eu3 +. There were significant correlations between the enzymes activities and the synthesis of polyphenols. The 100 μmol · L -1 La3 + showed more significantly promoting effects than the 400 μmol·L -1 Eu3 + on both P. koraiensis seedlings growth and polyphenols synthesis. Rare earth elements La3 + and Eu3 + may have acted as inductor of P. koraiensis secondary metabolism,elicitor-induce defensive responses in P. koraiensis,activate the phenylpropanoid pathway,change the activity of related enzymes,and thus enhance polyphenols synthesis.