Invasion of white clover roots by fungi and other soil micro-organisms IV. Survey of root-invading fungi and nematodes in some New Zealand pastures

Skipp, R. A.; Christensen, Michael J.

doi:10.1080/00288233.1983.10420966

Cited by 37 publications

(19 citation statements)

References 10 publications

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“…nematodes and culturable soil bacteria and fungi) have been surveyed (e.g. Skipp & Christensen 1983), but most studies investigating microbial communities and their processes have only been assessed in studies conducted across a few soils. The lack of information about the microbiology within New Zealand's pasture soils is surprising given that soil is the 'engine room' of pasture production, and pasture production currently contributes NZ$24.5 billion to the New Zealand economy annually (c. 12% GDP; BERL 2011).…”

mentioning

confidence: 99%

Physicochemical properties of 50 New Zealand pasture soils: a starting point for assessing and managing soil microbial resources

Wakelin

Koten

O’Callaghan

et al. 2013

New Zealand Journal of Agricultural Research

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New Zealand's pastoral agriculture faces challenges associated with increasing on-farm productivity, while minimizing the environmental footprint of farming. Soil microorganisms mediate a wide range of processes that affect plant production and also have environmental consequences. However, there has been little attempt to manage these in a farming system context. This is primarily because of difficulties in determining what microbiological resources are present in soils, how they link with soil processes and function, and how variation in soil types, climate or farm management practices influence microbial function. We sampled 50 pasture soils from across 11 of New Zealand's major soil groups, 10 geographical zones and under different grazing systems (high input dairy units to dry-stock grazing). The environmental and physicochemical properties of the soils were characterized and DNA extracted. The concentrations of elements primarily associated with fertilizer use (phosphorus, nitrogen and sulphur) were all significantly (P B 0.05) higher in dairy-based systems, yet soil carbon was unchanged. The concentration of many properties varied between the soil types, reflecting a combination of their pedogenesis and predominant land use. The amount of DNA in soils was closely related to anaerobically mineralizable nitrogen (P B 0.001), a measure of soil organic matter content, but did not vary with grazing system intensity. The extensive data set for each soil, coupled with DNA originating from the same samples, provides a unique opportunity for a number of ancillary studies to map biological resources in pastures and assess how these are regulated by edaphic and environmental properties.

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mentioning

confidence: 99%

Physicochemical properties of 50 New Zealand pasture soils: a starting point for assessing and managing soil microbial resources

Wakelin

Koten

O’Callaghan

et al. 2013

New Zealand Journal of Agricultural Research

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“…Rhizoctonia, have been isolated from white clover and ryegrass roots (Skipp & Christensen 1983, with C. fertilis being found predominantly in wanner areas such as upper North Island and north-western South Island. These fungi have been regarded as important white clover pathogens (Menzies 1973;Campbell 1982), but these reports did not attempt to investigate relationships between vigour and fungi populations in root tissues from field samples.…”

Section: Codinaea Fertilis With Fusarium Andmentioning

confidence: 99%

Microbial pathogens and plant parasitic nematodes in pastures with declining vigour

Sarathchandra

Watson

Skipp

et al. 2000

New Zealand Journal of Agricultural Research

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Two years after establishment, areas of low vigour (LV) were noticed within a white clover (Trifolium repens)/ryegrass (Lolium perenne) pasture. These areas became progressively larger, and, two years later, the pasture had low vigour, comprising only 3% white clover. Clover tissue nitrogen and phosphorus levels were greater in high vigour (HV) than in LV herbage. There were no differences (P > 0.05) in "total" bacteria, fluorescent pseudomonads, or proportions of deleterious bacteria in LV and HV white clover roots (mean logio CFUs for total count and fluorescent pseudomonads were 9.4 and 8.8, respectively, and the proportions of deleterious bacteria encountered in these groups were 6.9% and 17.5%). There was a 9-fold difference (P < 0.01) in the white clover dry matter between LV areas and HV areas in February, increasing to 25-fold (P< 0.01) in March. The total dry matter yield differences, which included grasses and clover, were 2.7-and 2-fold (P < 0.01) for the two months. More fungi were isolated (P < 0.05) from LV white clover roots than from HV roots (164 and 104 isolates, respectively). This was mostly due to greater numbers (P < 0.01) of Codinaea fertilis in LV roots (111 cf. 41 in HV). In ryegrass roots, there were also greater numbers (P < 0.01 ) of total fungi in LV roots (97 cf. 50 total A00024 isolates in HV), mostly due to higher populations of Fusarium oxysporum in LV roots (29 isolates cf. 5 in HV). There was no difference (P > 0.05) in the Soil Pathogenicity Index between LV and HV soil. The plant parasitic nematode populations in 250 ml of soil in LV and HV areas were 42.7 and 9.7 for Heterodera and 28.1 and 3.9 for Meloidogyne, respectively.

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“…Plectania rhytida (Berkeley) Hughes et Kendrick (Skipp & Christensen 1983) were not isolated from the roots. In general, the fungi found were typical of those occurring in a wet New Zealand hill country site.…”

Section: The Fungimentioning

confidence: 99%

Fungi of New Zealand subantarctic Islands

McKenzie

Foggo²

1989

New Zealand Journal of Botany

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A short historical account is given of fungal collections from the New Zealand subantarctic islands. Records of 28 fungus species from Auckland Islands, 27 from Campbell Island, and 9 from Snares Islands are based on collections made by botanists during a small number of brief visits over the period . There are no records from the two other subantarctic island groups, Bounty and Antipodes Islands. Substrates for the majority of fungirecorded are indigenous plant species.

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Invasion of white clover roots by fungi and other soil micro-organisms IV. Survey of root-invading fungi and nematodes in some New Zealand pastures

Cited by 37 publications

References 10 publications

Physicochemical properties of 50 New Zealand pasture soils: a starting point for assessing and managing soil microbial resources

Physicochemical properties of 50 New Zealand pasture soils: a starting point for assessing and managing soil microbial resources

Microbial pathogens and plant parasitic nematodes in pastures with declining vigour

Fungi of New Zealand subantarctic Islands

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