Influences of Low pH on the Arbuscule Formation and Phosphorus Nutrition of Tomato Seedlings
Author(s): FENG Zeng-wei, WANG Ning, ZHU Hong-hui, YAO Qing
Pages: 301-307
Year: 2016 Issue: 4
Journal: Subtropical Plant Science
Keyword: low pH; arbuscular mycorrhizal fungi; arbuscule formation; tomato;
Abstract: Tomato inoculated with 3 AMF species, Rhizophagus irregularis, Gigaspora margarita and Acaulospora delicata, at different pH values (4.5 or 6.5), the influences of low pH on the arbuscule formation and function of AMF in tomato roots were investigated. The results indicated that low pH significantly inhibited the AMF colonization and the arbuscule formation in roots. Three AMF species varied greatly with G. margarita showing the highest colonization and R. irregularis showing the most sensitive arbuscule abundance to low pH. AMF significantly elevated the plant biomass and decreased the root to shoot ratio. The effects of low pH on alkaline phosphatase (ALP) activity shared the similar pattern with those on root colonization. AMF significantly increased the shoot phosphorus content and the LePT4 expression in roots;however, pH did not affect them. These results suggested that low pH was inhibitory to the establishment and maintenance of AMF-host symbiosis, and the beneficial effects of AMF was greater at low pH. Moreover, different AMF species/isolates could vary greatly in the ability to increase the resistance of hosts to low pH.
Pages: 301-307
Year: 2016 Issue: 4
Journal: Subtropical Plant Science
Keyword: low pH; arbuscular mycorrhizal fungi; arbuscule formation; tomato;
Abstract: Tomato inoculated with 3 AMF species, Rhizophagus irregularis, Gigaspora margarita and Acaulospora delicata, at different pH values (4.5 or 6.5), the influences of low pH on the arbuscule formation and function of AMF in tomato roots were investigated. The results indicated that low pH significantly inhibited the AMF colonization and the arbuscule formation in roots. Three AMF species varied greatly with G. margarita showing the highest colonization and R. irregularis showing the most sensitive arbuscule abundance to low pH. AMF significantly elevated the plant biomass and decreased the root to shoot ratio. The effects of low pH on alkaline phosphatase (ALP) activity shared the similar pattern with those on root colonization. AMF significantly increased the shoot phosphorus content and the LePT4 expression in roots;however, pH did not affect them. These results suggested that low pH was inhibitory to the establishment and maintenance of AMF-host symbiosis, and the beneficial effects of AMF was greater at low pH. Moreover, different AMF species/isolates could vary greatly in the ability to increase the resistance of hosts to low pH.
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