Abstract:

To Juniperus formosana ‘Blue Arrow’ as the research object, using polyethylene glycol 6000 ( PEG-6000 ) in the indoor simulated drought stress, testing the changes of RWC, relative conductivity, content of soluble protein, free proline, soluble sugar and MDA under drought stress of different degree. The results showed that, various index changes with time corresponding changes, RWC decreased with prolonged treatment, When dealing with a 5 days, 20% and 30% PEG treatment of RWC significantly decreased, respectively 37.38% and 56.60% lower than that of control, the relative conductivity and soluble protein and MDA content first increased and then decreased, they reached the peak in 15 days. The proline content increased with prolonged treatment and 10 days later increased slowly, soluble sugar content showed a gradual upward trend, on day 20, under 3 kinds of processing concentration stress, soluble sugar content respectively controlled 1.9, 2.2, 2.3 times. Therefore, these indices above indicated that Juniperus formosana ‘Blue Arrow’ had the ability to resist drought conditions and to adapt relatively strong drought stress by adjusting its osmotic substance and water potential.