Effects of soil compaction on plant growth phosphorus uptake and morphological characteristics of vesicular—arbuscular mycorrhizal colonization of <i>Trifolium subterraneum</i>

Nadian, H.; Smith, Sally E.; Alston, A. M.; Murray, R. G. E.

doi:10.1046/j.1469-8137.1997.00653.x

Cited by 62 publications

(35 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, the role of arbuscules have not been fully confirmed, and other exchange sites-including coiling AMF-are possible (Brundrett 2004;Brundrett 2009). Total root length colonized by AMF, either on a per-plant or per-ground area basis, has also been used (e.g., Nadian et al 1997;Allen 2001). This index may be a closer estimate of AMF abundance within a plant or ecosystem, respectively.…”

Section: How Are Arbuscular Mycorrhizal Fungi Assessed?mentioning

confidence: 99%

The extent of mycorrhizal colonization of roots and its influence on plant growth and phosphorus content

2013

View full text Add to dashboard Cite

Aims The most common metric of arbuscular mycorrhizal fungal (AMF) abundance is percent root length colonized (PRLC) by mycorrhizal structures. Frequently, plants with greater PRLC are assumed to receive more nutrients (such as phosphorus, P) from their mycorrhizal symbionts, leading to greater plant growth. Nevertheless, the functional significance of this metric remains controversial. In this review, I discuss whether manipulations of PRLC generally led to changes in plant biomass and P content, and whether AMF taxa and plant functional groups influence these relationships. Methods I conducted a meta-analysis of laboratoryand field-based trials in which mycorrhizal colonization was directly altered compared to unmanipulated controls. For each trial, I calculated (1) the difference in PRLC (ΔPRLC) between the treatments, and (2) the response ratio of plant biomass. In a subset of these studies, the response ratio of P content of host plants could also be calculated. ResultsThe response ratio of plant biomass and P content rose significantly and exponentially as ΔPRLC increased. Nevertheless, ΔPRLC explained only a fraction of the variation in response ratios in each case. Moreover, AMF taxa varied in their effects on biomass per unit ΔPRLC. In addition, plant functional groups differed in effects on plant P content per unit ΔPRLC, with C4 grasses responding most strongly. Conclusions It appears that as the extent to which plant roots are colonized by AMF increases, plant growth and P content often increase, although substantial variability exists among trials. As others have found, a likely mechanism for this relationship is increased transfer of P (and perhaps other nutrients) through the more-prevalent mycorrhizal structures.

show abstract

Section: How Are Arbuscular Mycorrhizal Fungi Assessed?mentioning

confidence: 99%

The extent of mycorrhizal colonization of roots and its influence on plant growth and phosphorus content

2013

View full text Add to dashboard Cite

show abstract

“…City Beach in compacted soil can be attributed to the combined effects of decreased total root length and root length colonized. Our previous results obtained with G. intraradices (Nadian et al, 1997) indicated that soil compaction to a bulk density of 1n60 Mg m −$ had no effect on the fraction of root length containing arbuscules and vesicles, but total root length colonized by arbuscules, vesicles or by any combination of arbuscules, vesicles and intraradical hyphae significantly decreased. The simplest explanation for the data from fatty acid analysis presented here is that the biomass of mycorrhizal fungi (presumably including the external hyphae and spores) also declines as soil compaction increases.…”

Section: mentioning

confidence: 99%

“…Before compacting the soil, P fertilizer (as NaH # PO % ) was mixed throughout the sieved soil at a rate that would give 15 mg P dm −$ soil after compaction (Nadian et al, 1997). In our previous work (Nadian et al, 1996), the greatest mycorrhizal growth response of Trifolium subterraneum to Glomus intraradices was achieved when the soil was supplied with 15 mg P dm −$ ; this level of P was therefore used in the present study.…”

Section: Phosphate Applicationmentioning

confidence: 99%

“…We previously showed that Glomus intraradices increased P uptake and shoot d. wt of Trifolium subterraneum in compacted soil, although mycorrhizal growth response decreased with increasing soil compaction (Nadian et al, 1996(Nadian et al, , 1997. Some changes in soil physical properties arising from soil compaction, such as poor soil aeration, and collapse of most large pores might differently affect development of mycorrhizal colonization by different species of VAM fungi.…”

Section: mentioning

confidence: 99%

“…The soils were collected from the 0-20-cm layers at Avon and Adelaide in South Australia, respectively. Some properties of this soil mix were given in our previous paper (Nadian et al, 1997).…”

Section:   mentioning

confidence: 99%

See 2 more Smart Citations

Effects of soil compaction on phosphorus uptake and growth of Trifolium subterraneum colonized by four species of vesicular–arbuscular mycorrhizal fungi

Nadian¹,

Smith

Alston

et al. 1998

New Phytologist

Self Cite

View full text Add to dashboard Cite

The ability of four species of vesicular-arbuscular mycorrhizal (VAM) fungi to increase phosphorus uptake and growth of clover plants (Trifolium subterraneum L.) at different levels of soil compaction and P application was studied in a pot experiment. Dry matter in the shoots and roots of clover plants decreased with increasing soil compaction. Colonization by Glomus intraradices Schenck & Smith and Glomus sp. City Beach WUM 16 increased plant growth and P uptake up to a bulk density of 1n60 Mg m −$ , although the response was smaller as soil compaction was increased. Glomus etunicatum Becker & Gerdeman and Glomus mosseae (Nicol. & Gerd.) Gerdemann & Trappe had no effect on the shoot d. wt and P uptake when the bulk density of the soil was 1n40 and 1n60 Mg m −$ , respectively. Soil compaction to a bulk density of 1n60 Mg m −$ had no effect on the percentage of root length colonized by G. intraradices and Glomus sp. City Beach, but total root length colonized decreased as soil compaction was increased. Decreased P uptake and growth of clover plants colonized by G. intraradices and Glomus sp. City Beach, with increasing soil compaction up to a bulk density of 1n60 Mg m −$ , was mainly attributed to a significant reduction in total root length colonized and in the hyphal biomass. Soil compaction, which increased bulk density from 1n20 to 1n75 Mg m −$ , reduced the O # content of the soil atmosphere from 0n16 to 0n05 m$ m −$ . The absence of any observable mycorrhizal growth response to any of the four species of VAM fungi in highly compacted soil (bulk density l 1n75 Mg m −$ ) was attributed to the significant decrease in the O # content of the soil atmosphere, change in soil pore size distribution and, presumably, to ethylene production.

show abstract

Do agricultural grasses bred for improved root systems provide resilience to machinery‐derived soil compaction?

Muhandiram

Humphreys

Fychan

et al. 2020

Food and Energy Security

View full text Add to dashboard Cite

The increasing frequency of droughts and floods on grasslands, due to climate change, increases the risk of soil compaction. Soil compaction affects both soil and forage productivity. Differing grasses may counteract some effects of compaction due to differences in their root architecture and ontogeny. To compare their resilience to soil compaction, three Festulolium (ryegrass and fescue species’ hybrids) forage grass cultivars comprising differing root architecture and ontogeny were compared in replicated field plots, together with a ryegrass and tall fescue variety as controls. Pre‐compaction soil and forage properties were determined in spring using > four‐year‐old plots to generate baseline data. Half of each field plot was then artificially compacted using farm machinery. Forage dry matter yield (DMY) was determined over four cuts. After the final harvest, post compaction soil characteristics and root biomass (RB) were compared between grasses in the non‐compacted and compacted soils. Pre‐compaction data showed that soil under Festulolium and ryegrass had similar water infiltration rates, higher than soil under tall fescue plots. Tiller density of the Festulolium at this time was significantly higher than fescue but not the ryegrass control. Forage DMY was significantly lower (p < .001) with compacted soil at the first cut but, by the completion of the growing season, there was no effect of soil compaction on total DMY. Tall fescue had a higher total DMY than other grasses, which all produced similar annual yields. Soil bulk density and penetration resistance were higher, and grass tiller density was lower in compacted soils. Root biomass in compacted soils showed a tendency for Festulolium cv Lp × Fg to have higher RB than the ryegrass at 0–15 cm depth. Overall, findings showed alternative grass root structures provide differing resilience to machinery compaction, and root biomass production can be encouraged without negative impacts on forage productivity.

show abstract

Effects of soil compaction on plant growth phosphorus uptake and morphological characteristics of vesicular—arbuscular mycorrhizal colonization of Trifolium subterraneum

Cited by 62 publications

References 29 publications

The extent of mycorrhizal colonization of roots and its influence on plant growth and phosphorus content

The extent of mycorrhizal colonization of roots and its influence on plant growth and phosphorus content

Effects of soil compaction on phosphorus uptake and growth of Trifolium subterraneum colonized by four species of vesicular–arbuscular mycorrhizal fungi

Do agricultural grasses bred for improved root systems provide resilience to machinery‐derived soil compaction?

Contact Info

Product

Resources

About