4种南洋杉科植物耐盐性综合评价

Comprehensive Evaluation on Salt Tolerance of 4 Species of Arauceraceae

摘要:

为推广应用南洋杉科植物，比较了4种南洋杉科植物肯氏南洋杉(Araucaria cunninghamii)、异叶南洋杉(A. heterophylla)、大叶南洋杉(A. bidwillii)和贝壳杉(Agathis dammara)的耐盐能力，盐胁迫28 d后统计4种植物的盐害情况，并测定相关生理指标，采用隶属函数法对4种植物的耐盐性进行综合评价。结果表明，500 mmol/L NaCl胁迫28 d后，4种植物的盐害率均为100%；盐害指数依次为肯氏南洋杉>贝壳杉>异叶南洋杉>大叶南洋杉；4种植物的叶绿素含量、F_v/F_m、q_p、K⁺/Na⁺均比对照显著下降；可溶性糖含量均显著高于对照；脯氨酸含量除大叶南洋杉显著低于对照外，其余3种均显著高于对照；肯氏南洋杉和异叶南洋杉叶片中的POD活性显著增大，另2种变化不显著；4种植物叶片中的MDA含量和SOD活性变化均不显著。综合11个耐盐指标，4种植物的耐盐性依次为异叶南洋杉>贝壳杉>大叶南洋杉>肯氏南洋杉。

Abstract:

To promote the application of Araucariaceae plants, the salt tolerance of four Araucariaceae species, such as Araucaria cunninghamii, A. heterophylla, A. bidwillii and Agathis dammara, was compared. After 28 days of salt stress, the salt damage of the four species was statistically analyzed, the related physiological indicators were measured, and their salt tolerance was comprehensively evaluated by the membership function method. The results showed that under 500 mmol/L NaCl stress for 28 days, the salt damage rate of the four species was all 100%; the salt damage index was in the order of Araucaria cunninghamii>Agathis dammara> Araucaria heterophylla>A. bidwillii; the chlorophyll content, F_v/F_m, q_p and K⁺/Na⁺ of the four species were significantly lower than those of the control; the soluble sugar content was significantly higher than that of the control; the proline content of A. bidwillii was significantly lower than that of the control, while that of the other three species was significantly higher than that of the control; the POD activity in the leaves of A. cunninghamii and A. heterophylla significantly increased, while that of the other two species did not change significantly; the MDA content and SOD activity in the leaves of the four plants did not change significantly. Based on the comprehensive evaluation of 11 salt tolerance indicators, the salt tolerance of the four speciess was in the order of A. heterophylla > Agathis dammara > Araucaria bidwillii > A. cunninghamii.