盐分对红树植物秋茄某些生理特性的影响

Effect of Salinity on Some Physiological Characteristics of Kandelia candel

用ρ=0.03g·mL-1的NaCl溶液处理红树植物秋茄,对其根系和叶片中的SOD、CAT及C4光合途径关键酶PEPCase的活性变化进行分析,结果发现:盐胁迫24h内根系中SOD、CAT酶的活性显著高于叶片,而根系MDA含量在盐处理过程中的变化甚微,或仅略有下降,故认为秋茄已形成一套有效的根系保护机制;盐胁迫下PEPCase活性逐渐升高,因而认为盐分有利于红树向C4植物的光合代谢途径转变.

The variance of SOD, CAT and PEPCase activities in leaf and root of Kandelia candel were analysed during 24 h after the treatment by ρ=0.03 g·mL-1 NaCl solution. The results showed that: 1. the activities of SOD and CAT in roots were obviously higher than in leaves, and the content of MDA in roots remained stable or only declined a little, which proved that Kandelia candel reinforced the protection to the roots, and had formed an effective protection mechanism; 2.the activity of the PEPCase increased due to the extending of salinity treatment time, thus it was thought that salt was benefit to the change of photosynthetic metabolism from C3 to C4.