马占相思树苗的低温适应性研究

马占相思 (Acacia mangium) PNG1 786 8家系树苗在人工气候室经低温处理后 ,没有因为僵化而失去生长能力 ,体内相关的生理指标产生明显变化。随着温度不断下降至 -6℃产生冻害 ,植株的电导率升高了4 5 9% ,脯氨酸含量升高了 6 2 .4 % ,可溶性糖含量升了 2 6 .2 % ,可溶性蛋白含量升高了 2 5 .9%。表明马占相思PNG1 786 8树苗对低温有一定适应能力。脯氨酸、可溶性糖和蛋白的含量提高可能是植株抗冷性的机制。

Study on the adaptation of Acacia mangium plant to low temperature stress

After the plants of Acacia mangium PNG17868 clone were treated with low temperature in phytotron,some physiological indices changed obviously. When the temperature decreased down gradually to -6 ℃,the electrical conductivity of the leaf blades obviously raised by 459%,the contents of proline obviously raised by 62.4%,the contents of soluble sugars obviously raised by 26.2%,the contents of soluble proteins obviously raised by 25.9%.The experimental results indicated that the plants of Acacia mangium PNG17868 clone could produce a preventing reaction to low temperature stress.The increase of the contents of proline,soluble sugars,soluble proteins might played an important roles in cold tolerance of the plants.