Increased abundance of arbuscular mycorrhizal fungi in soil coincides with the reproductive stages of maize

被引:7
作者
Grigera, M. Susana
Drijber, Rhae A.
Wienhold, Brian J.
机构
[1] Univ Nebraska, Dept Agron & Hort, Lincoln, NE 68583 USA
[2] Univ Nebraska, USDA ARS, Lincoln, NE 68583 USA
关键词
AM fungi; FAMEs; bray P; maize (Zea mays L.); MICROBIAL COMMUNITIES; PHOSPHORUS-NUTRITION; FATTY-ACIDS; CARBON; BIOMASS; GROWTH; CORN; COLONIZATION; ACCUMULATION; METABOLISM;
D O I
10.1016/j.soilbio.2006.11.025
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Arbuscular mycorrhizal (AM) fungi are recognized for their positive effects on plant growth, playing an important role in plant P nutrition. We used C16:1cis11 and C18:1cis11 fatty acid methyl ester (FAME) biomarkers to monitor the dynamics of AM fungi during the reproductive stages of maize (Zea mays L.) grown at high yield in Nebraska, USA. Two fields with four different levels of P availability were sampled throughout the reproductive stages. Chambers, made of PVC enclosed mesh fabric to allow passage of roots and hyphae (+R) or hyphae alone (-R) and amended with either KH2PO4 (+P) or distilled water (-P), were installed in the field at tasselling and removed after three, six and nine weeks. Our objectives were (i) to provide evidence for C allocation to AM fungi during the reproductive stages of high productivity maize and (ii) to link AM fungal growth dynamics with changes in soil P availability. We observed that initial AM FAME concentration was lower at sites with a high availability of P. During the reproductive growth of maize, AM biomarkers increased inside the chambers and were consistent with the biomarker increase observed in adjacent field soil. This confirms that there is C allocation from the plant to the symbiont during the reproductive stages of maize. We also observed a reduction in available P in +R and -R chambers. This observation implies that hyphae were as efficient as roots and hyphae in reducing the P concentration in chambers. These results demonstrate that AM fungi are active during the reproductive growth stages of maize and may benefit high productivity maize crops by facilitating P uptake. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1401 / 1409
页数:9
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