EM菌对NaCl胁迫下核桃幼苗生长、光合特性及抗氧化系统的影响

【目的】 研究EM菌(Effective Microorganisms)对盐胁迫下核桃幼苗生长、光合特性及抗氧化系统的影响。【方法】 采用盆栽试验,分析不同 NaCl浓度(0、0.4%、0.8%和1.2%)持续胁迫下,接种EM真菌对和田厚皮实生核桃幼苗耐盐性的影响。【结果】 随着盐胁迫浓度的升高,各处理幼苗生物量、光合能力及抗氧化能力均显著降低。在不同 NaCl浓度胁迫条件下,接种EM菌的幼苗生物量、光合能力以及超氧化物歧化酶(SOD)和过氧化物酶(POD)活性均显著高于非菌根植株,而叶片相对电导率和丙二醛(MAD)含量显著低于非菌根植株。盐胁迫后,非菌根植株的幼苗叶片相对电导率、MAD含量、SOD和POD酶活性变化幅度明显大于接种EM菌的幼苗。【结论】 核桃幼苗对盐胁迫比较敏感,EM菌可提高幼苗生物量、光合能力及抗氧化能力,从而提高核桃幼苗耐盐性。

Effects of EM Fungi on the Growth,Photosynthetic Characteristics and Antioxidant System of Walnut Seedlings under NaCl Stress

【Objective】 This project aims to explore the effects of EM fungi on the growth, photosynthetic characters and antioxidant system of walnut seedlings under NaCl stress.【Method】 Effects of EM fungi on salt tolerance of walnut seedlings were studied in pot culture under different NaCl concentrations (0, 0.4%, 0.8% and 1.2%).【Result】 With the increase of stress concentration, the biomass, photosynthetic ability and antioxidant capacity of walnut seedlings decreased significantly in various treatments. Under different NaCl stress, inoculation of EM enhanced biomass and photosynthetic capacity of walnut seedlings. At the same time, superoxide dismutase (SOD) and peroxidase (POD) activities of seedlings inoculated with EM were significantly higher than those in non-inoculated plants, and the relative electric conductivity and malondialdehyde (MDA) content were significantly lower than those in non- inoculated plants. In addition, variation in relative electric conductivity, MAD content, SOD and POD enzyme activity of non-inoculated seedlings were obviously greater than those of inoculated seedlings, after stress.【Conclusion】 The walnut seedlings are sensitive to salt stress. EM fungi can improve salt tolerance of seedlings by increasing their biomass, photosynthetic capacity and antioxidant capacity.