丛枝菌根真菌对红树植物耐盐性的影响

为研究丛枝菌根真菌(Arbuscular mycorrhizal fungi,AMF)对红树植物耐盐性的影响,采用盆栽试验方法,利用本研究室分离得到的一株AMF侵染尖瓣海莲幼苗,以非侵染植株为对照,检测在不同程度盐胁迫下植物的根系电导率、脯氨酸、丙二醛(MDA)、抗氧化酶系活力的变化。结果表明,在高浓度盐胁迫下,AMF能够显著降低植物根系电导率、脯氨酸含量、MDA含量,保持超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)活力较低的增长幅度,在一定程度上保护了红树植物根系细胞膜系统,保持细胞渗透平衡,有效缓解盐胁迫对植物根系的伤害,提高了植物的耐盐性。

Effects of Arbuscular Mycorrhizal Fungi on the Salt Tolerance of the Mangrove Plant

The effects of arbuscular mycorrhizal fungi (AMF) on the salt tolerance of the mangrove plant were studied. A strain of AMF isolated from mangrove plant was inoculated to Bruguiera Sexangula var. rhynchopetala seedlings. The plants were grown in soil with four salt concentrations by pot-cultivated, the non-inoculated plant was used as the control,and eval-uated after 90 d. The results showed that the root electronic conductivities, proline and malonaldehyde (MDA) accumulation of the AMF inoculated plants(AM groups) were significant lower than non-mycorrhizal plants (NAM groups) in the high con-centrations of NaCl treatments. AMF also kept the superoxide dismutase(SOD), catalase(CAT) and peroxidase(POD) activities increasing slowly. AMF could maintain the integrity of plant membrane system and osmotic balance in some degree,alleviate and enhance the tolerance of the mangrove plants under salt stress, especially in the high salt concentration.