Efficiency of VAM hyphae in utilisation of organic phosphorus by wheat plants

Tarafdar, J. C.; Marschner, H.

doi:10.1080/00380768.1994.10414298

Cited by 75 publications

(31 citation statements)

References 35 publications

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“…For example, Hodge et al (2001) and Hodge (2003) reported increased rates of mineralization of N bound in plant residues in the presence of an AM fungus, and Koide and Kabir (2000) reported acquisition of P by the AM hyphae from organic forms in an in vitro system. This compounded previous reports on AM fungal acquisition of phosphorus from organic sources in soil (Tarafdar and Marschner, 1994; Feng et al, 2003). These findings have, however, sometimes been difficult to replicate and/or interpret (Joner and Jakobsen, 1995; Hodge et al, 2000; Hodge, 2001).…”

Section: Functions Of the Associative Microbessupporting

confidence: 78%

Mycorrhizal hyphae as ecological niche for highly specialized hypersymbionts – or just soil free-riders?

Jansa¹,

Bukovská²,

Gryndler³

2013

Front. Plant Sci.

121

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Mycorrhizal fungi interconnect two different kinds of environments, namely the plant roots with the surrounding soil. This widespread coexistence of plants and fungi has important consequences for plant mineral nutrition, water acquisition, carbon allocation, tolerance to abiotic and biotic stresses and interplant competition. Yet some current research indicates a number of important roles to be played by hyphae-associated microbes, in addition to the hyphae themselves, in foraging for and acquisition of soil resources and in transformation of organic carbon in the soil-plant systems. We critically review the available scientific evidence for the theory that the surface of mycorrhizal hyphae in soil is colonized by highly specialized microbial communities, and that these fulfill important functions in the ecology of mycorrhizal fungal hyphae such as accessing recalcitrant forms of mineral nutrients, and production of signaling and other compounds in the vicinity of the hyphae. The validity of another hypothesis will then be addressed, namely that the specific associative microbes are rewarded with exclusive access to fungal carbon, which would qualify them as hypersymbionts (i.e., symbionts of symbiotic mycorrhizal fungi). Thereafter, we ask whether recruitment of functionally different microbial assemblages by the hyphae is required under different soil conditions (questioning what evidence is available for such an effect), and we identify knowledge gaps requiring further attention.

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Section: Functions Of the Associative Microbessupporting

confidence: 78%

Mycorrhizal hyphae as ecological niche for highly specialized hypersymbionts – or just soil free-riders?

Jansa¹,

Bukovská²,

Gryndler³

2013

Front. Plant Sci.

121

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“…Variation in length and density of root hairs is important particularly under conditions of low P and their contribution to P uptake has been verified through modelling studies and the use of root-hairless mutants (Gahoonia and Nielsen 2003;Ma et al 2001). Mycorrhizal colonization of roots (as discussed below) similarly provides a significant increase in the effective volume of soil explored with associated depletion of soil P (Tarafdar and Marschner 1994 and as modelled by Schnepf et al 2008). Interestingly, the benefit derived from mycorrhizal fungi has been shown to be inversely associated with root hair length across a range of plant species, suggesting a complementary function of these traits (Baon et al 1994;Schweiger et al 1995).…”

Section: Depletion Of Phosphorus In the Rhizospherementioning

confidence: 93%

Acquisition of phosphorus and nitrogen in the rhizosphere and plant growth promotion by microorganisms

et al. 2009

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International audienceThe rhizosphere is a complex environment where roots interact with physical, chemical and biological properties of soil. Structural and functional characteristics of roots contribute to rhizosphere processes and both have significant influence on the capacity of roots to acquire nutrients. Roots also interact extensively with soil microorganisms which further impact on plant nutrition either directly, by influencing nutrient availability and uptake, or indirectly through plant (root) growth promotion. In this paper, features of the rhizosphere that are important for nutrient acquisition from soil are reviewed, with specific emphasis on the characteristics of roots that influence the availability and uptake of phosphorus and nitrogen. The interaction of roots with soil microorganisms, in particular with mycorrhizal fungi and non-symbiotic plant growth promoting rhizobacteria, is also considered in relation to nutrient availability and through the mechanisms that are associated with plant growth promotion

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“…In experiments with plants grown in 32 P-labelled soil, the specific activity of P in colonised and uncolonised plants is generally found to be the same, indicating that both plants are accessing P from the same isotopic pools (Tinker and Nye 2000). Li et al (1991) also showed that both mycorrhizal and non-mycorrhizal plants decreased the concentration of inorganic P in soil but did not affect the concentration of organic P. In contrast, a study by Tarafdar and Marschner (1994) showed a large depletion of organic P by AM hyphae, and Koide and Kabir (2000) clearly demonstrated the ability of the mycorrhizal fungus Glomus intraradices to hydrolyse organic P. Thus, mycorrhizal studies show a similar variation in whether organic P can be solubilised, as do the studies on plant roots (see earlier discussion). The variation in results may be due to soil type, species of mycorrhizal fungi and host plant, and plant age.…”

Section: Association With Mycorrhizal Fungimentioning

confidence: 95%

Progress in selected areas of rhizosphere research on P acquisition

et al. 2003

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Large reserves of P have accumulated in soils of developed countries because additions of P fertiliser to sustain agricultural production have exceeded crop removal. By contrast, in many developing countries in the tropics and subtropics, soil P reserves are gravely low and large additions are required before maintenance requirements begin to decline. In addition, the cost of P fertiliser will increase as the currently accessible deposits of high-grade phosphate rock (PR) diminish. Developing plants that efficiently tap soil P reserves and low grade PR is therefore a priority for agricultural research. For the 50th anniversary of the New Zealand Soil Science Society, this paper reviews research on P efficiency in plants, conducted by staff, students, and research associates of Massey University, in the context of other research into plant mechanisms that enhance P uptake, including effects of root geometry, mycorrhizal associations, and root-induced changes in the soil. Techniques for fractionation of soil P are highlighted. S R 0 2 1 3 0 R h i z o s p h e r e P a c q u i s i t i o n S . N . T r o l o v e e t a l .

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Efficiency of VAM hyphae in utilisation of organic phosphorus by wheat plants

Cited by 75 publications

References 35 publications

Mycorrhizal hyphae as ecological niche for highly specialized hypersymbionts – or just soil free-riders?

Mycorrhizal hyphae as ecological niche for highly specialized hypersymbionts – or just soil free-riders?

Acquisition of phosphorus and nitrogen in the rhizosphere and plant growth promotion by microorganisms

Progress in selected areas of rhizosphere research on P acquisition

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