Contrasting communities of arbuscule-forming root symbionts change external critical phosphorus requirements of some annual pasture legumes

Robert P. Jeffery, Richard J. Simpson, Hans Lambers, Suzanne Orchard, Daniel R. Kidd, Rebecca E. Haling, Megan H. Ryan

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Annual pasture legumes with a superior ability to acquire soil phosphorus (P) and a low external critical P requirement could reduce the need for P fertiliser. Roots of pasture legumes grown in field soil will commonly be colonised by arbuscular mycorrhizal fungi (AMF). However, recent research suggests a second community of arbuscule-forming root-colonising fungi may be present: fine root endophytes (FRE). AMF are known to enhance P acquisition by plants under certain conditions, whereas very little is known about FRE and their impact on plant P status. We, therefore, grew plants at seven levels of P supply to determine and compare the external critical P requirements of two species of Ornithopus and two cultivars of Trifolium subterraneum when colonised predominantly by FRE (FRE-dominant treatment) or both FRE and AMF (mixed treatment). As expected from previous studies, the Ornithopus species had a lower critical P requirement than the T. subterraneum cultivars. However, for the Ornithopus species only, the FRE-dominant community had a significantly lower external critical P requirement (24–31 mg P kg−1 soil) than the mixed community (50–58 mg P kg−1 soil). Moreover, at low-P supply (≤15 mg applied P kg−1 soil), Ornithopus species in the FRE-dominant treatment had longer specific root length, smaller average root diameter, 45–128% greater total root length, and lower shoot and root P concentration than in the mixed treatment. We concluded that comparisons among experiments of root morphological traits and external critical P requirements can be affected by the presence of different communities of arbuscule-forming root-colonising fungi and that these effects may vary among plant species.

Original languageEnglish
Pages (from-to)88-97
Number of pages10
JournalApplied Soil Ecology
Volume126
DOIs
Publication statusPublished - 1 May 2018

Fingerprint

Endophytes
forage legumes
symbiont
endophyte
Fabaceae
fine root
symbionts
Phosphorus
endophytes
Ornithopus
pasture
phosphorus
Fungi
Soil
fungus
mycorrhizal fungi
Trifolium subterraneum
soil
cultivar
Trifolium

Cite this

Jeffery, Robert P. ; Simpson, Richard J. ; Lambers, Hans ; Orchard, Suzanne ; Kidd, Daniel R. ; Haling, Rebecca E. ; Ryan, Megan H. / Contrasting communities of arbuscule-forming root symbionts change external critical phosphorus requirements of some annual pasture legumes. In: Applied Soil Ecology. 2018 ; Vol. 126. pp. 88-97.
@article{1111335ef03042b98895bb462fb88ced,
title = "Contrasting communities of arbuscule-forming root symbionts change external critical phosphorus requirements of some annual pasture legumes",
abstract = "Annual pasture legumes with a superior ability to acquire soil phosphorus (P) and a low external critical P requirement could reduce the need for P fertiliser. Roots of pasture legumes grown in field soil will commonly be colonised by arbuscular mycorrhizal fungi (AMF). However, recent research suggests a second community of arbuscule-forming root-colonising fungi may be present: fine root endophytes (FRE). AMF are known to enhance P acquisition by plants under certain conditions, whereas very little is known about FRE and their impact on plant P status. We, therefore, grew plants at seven levels of P supply to determine and compare the external critical P requirements of two species of Ornithopus and two cultivars of Trifolium subterraneum when colonised predominantly by FRE (FRE-dominant treatment) or both FRE and AMF (mixed treatment). As expected from previous studies, the Ornithopus species had a lower critical P requirement than the T. subterraneum cultivars. However, for the Ornithopus species only, the FRE-dominant community had a significantly lower external critical P requirement (24–31 mg P kg−1 soil) than the mixed community (50–58 mg P kg−1 soil). Moreover, at low-P supply (≤15 mg applied P kg−1 soil), Ornithopus species in the FRE-dominant treatment had longer specific root length, smaller average root diameter, 45–128{\%} greater total root length, and lower shoot and root P concentration than in the mixed treatment. We concluded that comparisons among experiments of root morphological traits and external critical P requirements can be affected by the presence of different communities of arbuscule-forming root-colonising fungi and that these effects may vary among plant species.",
keywords = "French serradella, Glomus tenue, Subterranean clover, Yellow serradella",
author = "Jeffery, {Robert P.} and Simpson, {Richard J.} and Hans Lambers and Suzanne Orchard and Kidd, {Daniel R.} and Haling, {Rebecca E.} and Ryan, {Megan H.}",
year = "2018",
month = "5",
day = "1",
doi = "10.1016/j.apsoil.2018.01.009",
language = "English",
volume = "126",
pages = "88--97",
journal = "Applied Soil Ecology",
issn = "0929-1393",
publisher = "Elsevier",

}

Contrasting communities of arbuscule-forming root symbionts change external critical phosphorus requirements of some annual pasture legumes. / Jeffery, Robert P.; Simpson, Richard J.; Lambers, Hans; Orchard, Suzanne; Kidd, Daniel R.; Haling, Rebecca E.; Ryan, Megan H.

In: Applied Soil Ecology, Vol. 126, 01.05.2018, p. 88-97.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Contrasting communities of arbuscule-forming root symbionts change external critical phosphorus requirements of some annual pasture legumes

AU - Jeffery, Robert P.

AU - Simpson, Richard J.

AU - Lambers, Hans

AU - Orchard, Suzanne

AU - Kidd, Daniel R.

AU - Haling, Rebecca E.

AU - Ryan, Megan H.

PY - 2018/5/1

Y1 - 2018/5/1

N2 - Annual pasture legumes with a superior ability to acquire soil phosphorus (P) and a low external critical P requirement could reduce the need for P fertiliser. Roots of pasture legumes grown in field soil will commonly be colonised by arbuscular mycorrhizal fungi (AMF). However, recent research suggests a second community of arbuscule-forming root-colonising fungi may be present: fine root endophytes (FRE). AMF are known to enhance P acquisition by plants under certain conditions, whereas very little is known about FRE and their impact on plant P status. We, therefore, grew plants at seven levels of P supply to determine and compare the external critical P requirements of two species of Ornithopus and two cultivars of Trifolium subterraneum when colonised predominantly by FRE (FRE-dominant treatment) or both FRE and AMF (mixed treatment). As expected from previous studies, the Ornithopus species had a lower critical P requirement than the T. subterraneum cultivars. However, for the Ornithopus species only, the FRE-dominant community had a significantly lower external critical P requirement (24–31 mg P kg−1 soil) than the mixed community (50–58 mg P kg−1 soil). Moreover, at low-P supply (≤15 mg applied P kg−1 soil), Ornithopus species in the FRE-dominant treatment had longer specific root length, smaller average root diameter, 45–128% greater total root length, and lower shoot and root P concentration than in the mixed treatment. We concluded that comparisons among experiments of root morphological traits and external critical P requirements can be affected by the presence of different communities of arbuscule-forming root-colonising fungi and that these effects may vary among plant species.

AB - Annual pasture legumes with a superior ability to acquire soil phosphorus (P) and a low external critical P requirement could reduce the need for P fertiliser. Roots of pasture legumes grown in field soil will commonly be colonised by arbuscular mycorrhizal fungi (AMF). However, recent research suggests a second community of arbuscule-forming root-colonising fungi may be present: fine root endophytes (FRE). AMF are known to enhance P acquisition by plants under certain conditions, whereas very little is known about FRE and their impact on plant P status. We, therefore, grew plants at seven levels of P supply to determine and compare the external critical P requirements of two species of Ornithopus and two cultivars of Trifolium subterraneum when colonised predominantly by FRE (FRE-dominant treatment) or both FRE and AMF (mixed treatment). As expected from previous studies, the Ornithopus species had a lower critical P requirement than the T. subterraneum cultivars. However, for the Ornithopus species only, the FRE-dominant community had a significantly lower external critical P requirement (24–31 mg P kg−1 soil) than the mixed community (50–58 mg P kg−1 soil). Moreover, at low-P supply (≤15 mg applied P kg−1 soil), Ornithopus species in the FRE-dominant treatment had longer specific root length, smaller average root diameter, 45–128% greater total root length, and lower shoot and root P concentration than in the mixed treatment. We concluded that comparisons among experiments of root morphological traits and external critical P requirements can be affected by the presence of different communities of arbuscule-forming root-colonising fungi and that these effects may vary among plant species.

KW - French serradella

KW - Glomus tenue

KW - Subterranean clover

KW - Yellow serradella

UR - http://www.scopus.com/inward/record.url?scp=85042154516&partnerID=8YFLogxK

U2 - 10.1016/j.apsoil.2018.01.009

DO - 10.1016/j.apsoil.2018.01.009

M3 - Article

VL - 126

SP - 88

EP - 97

JO - Applied Soil Ecology

JF - Applied Soil Ecology

SN - 0929-1393

ER -