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| Effects of Arbuscular Mycorrhizal Fungi and PGPR Combination Agents on
Growth and Defense Enzyme Activity of Cucumber under Low Temperature
Stress |
| HAN Ya-nan 1，2，LIU Run-jing1，LI Min1，2* |
（1Mycorrhizal Biotechnology Institue of Qingdao Agricultural University，Qingdao 266109，Shandong，China；
2Horticulture College of Qingdao Agricultural University，Qingdao 266109，Shandong，China） |
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Abstract In order to select the best combination of arbuscular mycorrhizal（AM） fungi and plant growthpromoting
rhizobacteria（PGPR） for cucumber（ Cucumis sativus）to resist low-temperature damages，we
studied the effects of different combinations on growth and defense enzymes in greenhouse under low temperature
stress conditions. The results showed that the growth of cucumber and SOD，POD，CAT activities were higher
than that of the non-vaccinated control，while MDA content was significantly lower than that of the controls，
when inoculation with AM fungi or PGPR under low temperature treatments. Between the AM fungi inoculation
treatments，Glomus versiforme had better positive effect on growth，defensive enzyme activities，and decreased
the cell membrane damage. Between the PGPR inoculation treatments，Paenibacillus polymyxa had better growth
and higher defensive enzyme activities，with less cell membrane damage. Among the inoculation treatments with
AM fungi and PGPR ，inoculation treatment with both Glomus versiforme and Paenibacillas polymyxa had the
best growth，highest defensive enzyme activities，minimum cell membrane damage. Hence，we would suggest
to add this combination in greenhouse cucumber production to promote cucumber growth and improve plant cold
resistance.
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Received: 26 April 2014
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