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| Effects of actinomycetes Act12 on the root growth and resistant physiology of perennial ryegrass under Pb stress |
| Received:March 09, 2016 |
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| KeyWord:Pb stress;actinomycetes;perennial ryegrass;root growth;resistant physiology |
| Author Name | Affiliation | | CAO Shu-miao | Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region(Ministry of Education), Chang'an University, Xi'an 710054, China | | WANG Wen-ke | Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region(Ministry of Education), Chang'an University, Xi'an 710054, China | | WANG Fei | College of Science, Air Force Engineering University, Xi'an 710054, China | | ZHANG Jun | Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region(Ministry of Education), Chang'an University, Xi'an 710054, China |
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| Abstract: |
| An inoculation pot experiment was conducted to investigate the effects of actinomycetes Act12 on the growth and resistant physiology of perennial ryegrass under Pb stress. Results showed that different levels of Pb stress affected the growth and physiological characteristics of ryegrass roots to various degrees. However, when inoculated with actinomycetes the root tiller number and root fresh weight were increased by 12.3%~44.2% and 19.2%~94.6%, respectively compared to control, indicating that actinomycetes could significantly promote root growth.Actinomycetes-inoculation increased root enzyme activities of catalase(CAT), superoxide dismulase(SOD) and peroxidase(POD) compared to control as well particularly in high level Pb stress(500~1000 mg·kg-1). Moreover, actinomycetes-inoculation decreased root malondiadehyde(MDA) content and increased root activity significantly.The study indicates that inoculation with Act12 could increase root antioxidant enzyme activities, reduce peroxidation damage of plasma membrane, improve root activity and Pb tolerance, and thus significantly promote root growth of ryegrass under Pb stress. |
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