Penicillium radicum sp. nov. from the rhizosphere of Australian wheat

Hocking, Ailsa D.; Whitelaw, Melanie; Harden, T. J.

doi:10.1017/s0953756297005698

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…65 ). Colonies are deep and consist of bright yellow mycelia that form a fluffy texture, with the production of funicles on MEA ( Hocking et al 1998 ). It also has the ability to grow at 37 and 40 °C.…”

Section: Taxonomy (Species Listed In Alphabetical Order)mentioning

confidence: 99%

Polyphasic taxonomy of the genus Talaromyces

Yılmaz¹,

Visagie²,

Houbraken³

et al. 2014

Studies in Mycology

336

396

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The genus Talaromyces was described by Benjamin in 1955 as a sexual state of Penicillium that produces soft walled ascomata covered with interwoven hyphae. Phylogenetic information revealed that Penicillium subgenus Biverticillium and Talaromyces form a monophyletic clade distinct from the other Penicillium subgenera. Subsequently, in combination with the recent adoption of the one fungus one name concept, Penicillium subgenus Biverticillium was transferred to Talaromyces. At the time, the new combinations were made based only on phylogenetic information. As such, the aim of this study was to provide a monograph on Talaromyces applying a polyphasic species concept, including morphological, molecular and physiological characters. Based on an ITS, BenA and RPB2 multigene phylogeny, we propose a new sectional classification for the genus, placing the 88 accepted species into seven sections, named sections Bacillispori, Helici, Islandici, Purpurei, Subinflati, Talaromyces and Trachyspermi. We provide morphological descriptions for each of these species, as well as notes on their identification using morphology and DNA sequences. For molecular identification, BenA is proposed as a secondary molecular marker to the accepted ITS barcode for fungi.

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Section: Taxonomy (Species Listed In Alphabetical Order)mentioning

confidence: 99%

Polyphasic taxonomy of the genus Talaromyces

Yılmaz¹,

Visagie²,

Houbraken³

et al. 2014

Studies in Mycology

336

396

View full text Add to dashboard Cite

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“…Penicillium species do not appear to exhibit specific plant or soil associations and have been shown to inhabit the rhizosphere of diverse agricultural and non-agricultural plants (Kucey 1983;Hocking et al 1998;Wakelin et al 2004;Babana and Antoun 2006;Khan et al 2008), indicating potential to select and develop inoculants for a broad range of agroecological conditions. P. bilaiae has been shown to solubilise P in laboratory media (Cunningham and Kuiack 1992;Takeda and Knight 2006;Wakelin et al 2004) and improve plant P uptake (Kucey 1988).…”

Section: Microbial Inoculantsmentioning

confidence: 99%

Plant and microbial strategies to improve the phosphorus efficiency of agriculture

et al. 2011

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Background Agricultural production is often limited by low phosphorus (P) availability. In developing countries, which have limited access to P fertiliser, there is a need to develop plants that are more efficient at low soil P. In fertilised and intensive systems, P-efficient plants are required to minimise inefficient use of P-inputs and to reduce potential for loss of P to the environment. Scope Three strategies by which plants and microorganisms may improve P-use efficiency are outlined: (i) Root-foraging strategies that improve P acquisition by lowering the critical P requirement of plant growth and allowing agriculture to operate at lower levels of soil P; (ii) P-mining strategies to enhance the desorption, solubilisation or mineralisation of P from sparingly-available sources in soil using root exudates (organic anions, phosphatases), and (iii) improving internal P-utilisation efficiency through the use of plants that yield more per unit of P uptake.Conclusions We critically review evidence that more P-efficient plants can be developed by modifying root growth and architecture, through manipulation of root exudates or by managing plant-microbial associations such as arbuscular mycorrhizal fungi and microbial inoculants. Opportunities to develop P-efficient plants through breeding or genetic modification are described and issues that may limit success including potential trade-offs and trait interactions are discussed. Whilst demonstrable progress has been made by selecting plants for root morphological traits, the potential for manipulating root physiological traits or selecting plants for low internal P concentration has yet to be realised.

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“…In Australia, an inoculant based on the fungus Penicillium radicum (Whitelaw et al 1997(Whitelaw et al , 1999Hocking et al 1998) has also been commercially developed. Initially it was thought that the PGP effect of P. radicum was achieved primarily through P solubilisation and enhanced plant P nutrition (Whitelaw et al 1997(Whitelaw et al , 1999.…”

Section: Penicillium-based Inoculants To Improve P Acquisition and Plmentioning

confidence: 99%

Potential to improve root access to phosphorus: the role of non-symbiotic microbial inoculants in the rhizosphere

2009

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Phosphate anions in soil solution are extremely reactive and may be rapidly immobilised in the soil through precipitation and adsorption reactions, resulting in sparingly soluble forms of phosphorus (P) that are essentially unavailable to plants. This low P-fertiliser efficiency is often offset through high application rates, which are economically and environmentally unsustainable and not an available option for organic producers. Microorganisms play a fundamental role in the biogeochemical cycling of inorganic and organic P in the rhizosphere and detritusphere. Free-living rhizosphere microbes can directly increase the availability of phosphate to plant roots via mechanisms associated with solubilisation and mineralisation of P from inorganic and organic forms of total soil P. These include releasing organic anions, H + ions, phosphatases, and cation chelating compounds into the rhizosphere. Many soil-borne microbes also increase P availability indirectly by producing phytohormones that increase root density and function. There is increasing interest worldwide in the use of rhizosphere microorganisms as inoculants to increase P availability for agricultural production. Recent research has focussed on developing actively sporulating Penicillium fungi known to express mechanisms to enhance P mobilisation and therefore, considered to be a key component of the mycoflora involved in P cycling in soils. Penicillium species do not exhibit specific plant or soil associations and have a broad agro-ecological range, indicating their potential to be developed as inoculants for a range of plant production systems. Successful adoption of microbial inoculants requires a thorough understanding of their rhizosphere ecology, genetic stability, and the mechanisms associated with enhancing P availability in soils and plant-growth promotion. This will provide a better understanding of which inoculants to use under particular agro-ecological conditions for increased efficacy and consistent performance.

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Penicillium radicum sp. nov. from the rhizosphere of Australian wheat

Cited by 13 publications

References 17 publications

Polyphasic taxonomy of the genus Talaromyces

Polyphasic taxonomy of the genus Talaromyces

Plant and microbial strategies to improve the phosphorus efficiency of agriculture

Potential to improve root access to phosphorus: the role of non-symbiotic microbial inoculants in the rhizosphere

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