几种保护酶活性变化与马占相思树对低温胁迫的抵抗性的关系研究

马占相思(Acacia mangium)QLD19835家系树苗在人工气候室经低温处理后,体内相关的生理指标及酶活性产生明显变化。随着温度不断下降至-6℃产生的冻害导致植株细胞膜ATP酶活性有所下降,而蛋白质的含量则显著升高,同时,细胞保护酶SOD、POD、CAT的活性呈下降趋势,但仍能维持较高的活性水平。这些实验结果表明,马占相思QLD19835对低温胁迫能产生一种防卫反应,从而对冻害有一定适应性,而具有一定活性的细胞保护酶及蛋白质的含量提高可能是植株有较强抗寒力的重要原因。

STUDY ON THE RELATIONSHIP BETWEEN THE CHANGE OF PROTECTION ENZYME ACTIVITIES AND THE RESISTANT ABILITY TO LOW TEMPERATURE STRESS IN ACACIA MANGIUM

After the plants of Acacia mangium QLD19835 clone were treated by low temperature in phytotrone, the physiology and the enzyme activities changed obviously. When the temperature reduced to -6℃, the cell membranes were damaged and the activity of ATPase decreased, but protein content increased obviously. The activities of SOD, CAT, and POD reduced but sustained in a relatively high level as the plants suffered from low temperature. The results of the experiment indicated that Acacia mangium QLD 19835 clone could have a protective reaction to the damage from low temperature. The high content of solube protein and relatively high level of enzyme activities of CAT, SOD, and POD in plants might be the important reason for high antichilling ability of the plants.