‘蓝箭’的抗旱动态特征研究

为了研究国外引进品种‘蓝箭’在中国北方较干旱地区的适应性，采用聚乙二醇6000(PEG-6000)在室内模拟干旱胁迫，测定不同程度干旱胁迫下‘蓝箭’幼苗相对含水量、质膜透性、可溶性蛋白、游离脯氨酸、可溶性糖和丙二醛含量的变化。结果表明：‘蓝箭’在PEG-6000处理下，各指标随时间变化出现相应的变化规律，相对含水量随处理时间的延长而降低，在第5天时，20%和30%浓度处理相对含水量明显下降，分别低于对照37.38%和56.60%，相对电导率、可溶性蛋白和丙二醛含量表现为先升高再降低，在处理15天时达到峰值，脯氨酸含量随处理时间延长升高，10天后升高变得缓慢，可溶性糖含量呈逐步上升趋势，20天时，3个处理浓度胁迫下的可溶性糖含量分别为对照的1.9倍、2.2倍、2.3倍。可见，‘蓝箭’在干旱胁迫下通过改变渗透调解物质含量和水势，进而增强保水力来提高其抗旱能力，忍受较强的干旱胁迫伤害。

Study on Drought-resistance Characteristics of Juniperus formosana ‘Blue Arrow’ under Osmotic Stress

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.