Record ID No. |
4826 |
Author(s) |
Wang F., Jiang R., Kertesz M.A., Zhang F., *Feng G. , 2013 |
Affiliation |
College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China, *Email: fenggu@cau.edu.cn |
Title |
Arbuscular mycorrhizal fungal hyphae mediating acidification can promote phytate mineralization in the hyphosphere of maize (zea mays L.) |
Source. Vol.(no):Page |
Soil Biology and Biochemistry 65: 69-74p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Phosphorus metabolism |
Host |
Zea mays |
Organism |
Rhizophagus intraradices |
Country |
China, East Asia |
Abstracts |
Mycorrhizal and non-mycorrhizal maize (Zea mays L.) plants were grown in two-compartment rhizoboxes, in order to study the effect of mycorrhizal hyphae-mediated acidification on organic P mineralization in the hyphosphere. The soil in the two compartments was supplemented with either KNO3 or (NH4)2SO4, and phytin (0 or 75mg Pkg-1) was added to the hyphal compartment. P content in the shoots was significantly higher for the NH4 + treatment than for the NO3 - treatment, but only in the combined presence of phytin and AM fungal mycelium (Rhizophagus intraradices). NH4 + treatment under these conditions also led to a decrease in hyphosphere pH, enhanced phosphatase activity in the hyphosphere and accelerated mineralization of phytin compared to the NO3 - treatment. The results show that hyphosphere acidification induced by absorption of NH4 + by the AM fungal mycelium leads to an increase in phosphatase activity, and consequently enhances mineralization of phytin and improves maize uptake of P from phytin-P. |