《Table 3 Root vigor and respiratory rate of I.polycarpa seedlings under drought stress simulated wit

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《Growth Response of Idesia polycarpa to Polyethylene Glycol》

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Different letters in the same column indicate a significant difference（P<0.05）.

Root vigor reflects the metabolic capability of root system，and directly influences plant growth and stress resistance.Table 3shows the determination results of root vigor and root respiratory rate of seedlings on the 7thday of drought treatment.It could be seen from Table 3 that with the PEG concentration increasing，the root vigor of various varieties decreased linearly.Among them，‘Exuan 2’showed the highest root vigor.At the PEG concentration of 15%，the three varieties differed remarkably in determined root vigor.In other treatments，‘Exuan 2’had higher root vigor，while there was no remarkable difference between other two varieties.