《Table 2 Growth situation of I.polycarpa seedlings under drought stress simulated with different con

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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）.

It could be seen from Table 2 that with the increase of PEG concentration，the dry matter contents in the stem and leaf and the root were on the decrease，and under the same PEG concentration，and the stem and leaf dry matter content ranked as‘Exuan1’>‘Exuan 2’>‘Chuantong 32’，and the root dry matter content ranked as‘Exuan 1’>‘Chuantong 32’>‘Exuan 2’，among which‘Exuan 1’had prominent superiority，‘Exuan 2’and‘Chuantong 32’were not significantly different.It could be seen from the root shoot ratio data that‘Exuan 1’showed the highest value of 1.32 at the PEG concentration of 15%，‘Exuan 2’exhibited the highest value of 1.59 at the PEG concentration of20%，and‘Chuantong 32’had the highest value of 1.67 at the PEG concentration of 20%.When the PEG concentration was over20%，the root shoot ratios of the three varieties decreased remarkably.With continuous PEG treatment on the three varieties，the dead seedling proportion increased with the PEG concentration increasing，and when the PEG concentration reached 25%，‘Exuan2’and‘Chuantong 32’both had dead seedling proportions over90%，while the dead seedling proportion of‘Exuan 1’was 83.69%.Comprehensively，continuous drought stress simulated with PEG on I.polycarpa seedlings had a remarkable inhibitory effect on the growth indices of the seedlings of various varieties.It could be seen from the determined indices of the three varieties that the seedlings of‘Exuan 1’has stronger resistance to the PEG stress than other two varieties.