Sexuality in Physoderma Pulposum Wallroth

Lingappa, Yamuna

doi:10.1080/00275514.1959.12024808

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…therein), leading to the widely held consensus that the life cycle is conserved across the genus. As for Physoderma (Lingappa 1959 ), sexuality seems optional in P. sedebokerense with infectious epibiotic zoospores being unfused gametes able to form new epibiotic sporangia parthenogenetically (Fig. 1b ).…”

Section: Resultsmentioning

confidence: 99%

“…By analogy with other blastocladiales, which all alternate between a haploid gametophytic (so-called epibiotic) and a diploid sporophytic (so-called endobiotic) phase, we hypothesise that our observation of a fusion between two amoebae could correspond to fertilisation between two gametes. Indeed, detailed and conclusive evidence of fertilisation between epibiotic amoeboid zoospores has been obtained in Physoderma pulposum (now called Urophlyctis pulposa , Lingappa 1959 ). Though their observations were slightly less thorough, similar fusion events have been reported by Sparrow and colleagues in many different Physoderma species (Sparrow 1975 and refs.…”

Section: Resultsmentioning

confidence: 99%

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A new flagellated dispersion stage in Paraphysoderma sedebokerense, a pathogen of Haematococcus pluvialis

Strittmatter

Guerra²,

Silva³

et al. 2015

J Appl Phycol

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The blastocladialean fungus Paraphysoderma sedebokerense Boussiba, Zarka and James is a devastating pathogen of the commercially valuable green microalga Haematococcus pluvialis, a natural source of the carotenoid pigment astaxanthin. First identified in commercial Haematococcus cultivation facilities, P. sedebokerense is hypothesised to have a complex life cycle that switches between a vegetative and a resting phase depending on favourable or unfavourable growth conditions. Rather unusually for blastocladialean fungi, P. sedebokerense was described as lacking flagellated zoospores and only propagating via aplanosporic amoeboid cells. However, during repeated microscopic observation of P. sedebokerense cultivated in optimal conditions, we detected fast-swimming, transiently uniflagellated zoospores which rapidly transform into infectious amoeboid swarmers, the existence of which suggests a closer than previously thought relatedness of P. sedebokerense to its sister genera Physoderma and Urophlyctis. Additionally, we found some morphological and physiological differences between amoeboid swarmers and discuss hypotheses about their significance. These amoeboid and flagellated propagules are key to the dissemination of P. sedebokerense and are probably also the life stages most vulnerable to adverse environmental conditions. They are therefore a prime target for the development of disease management protocols in industrial cultivation facilities, a goal which requires a detailed understanding of their physiology.Electronic supplementary materialThe online version of this article (doi:10.1007/s10811-015-0700-8) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A new flagellated dispersion stage in Paraphysoderma sedebokerense, a pathogen of Haematococcus pluvialis

Strittmatter

Guerra²,

Silva³

et al. 2015

J Appl Phycol

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“…These are obligate parasites of vascular plants and have not as yet been cultured apart from their hosts. The monocentric thalli of these fungi were lqpg considered by this writer to be gametangia and such was shown to be true by Lingappa (1959) for Urophlyctis pulposa.…”

Section: Rhizophydiummentioning

confidence: 81%

Zoosporic fungi from Tunisia, and the Seychelles Islands (Indian Ocean)

Sparrow

1975

Arch. Microbiol.

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Observations on Chytridiaceous Parasites of Phanerogams. Xi. A Physoderma on Agropyron Repens

Sparrow

Griffin

Johns

1961

American J of Botany

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Observations on chytridiaceous parasites of phanerogams. XI. A Physoderma on Agropyron repens. Amer. Jour. Bot. 48(9): 850-858. Illus. 1961.-A Physoderma has been found in MichiganÃ gropyron repens, which produces dark-brown, non-erumpent streaks up to 20 mm (usually 4-6 mm) in length by 0.5 mm in width and very local discoloration of the leaf blades and sheaths. There is no systemic infection, and plants parasitized are norrn rl in size and bear flowers. Resting spores upon germination produce zoospores which may develop either into the endobiotic, polycentric, resting spore-bearing thallus or into monocentric, epibiotic, ephemeral sporangia. The latter bear either colorless or orange globuled zoospores. These zoospores may give rise to new epibiotic sporangia, or, apparently without fusing in pairs, to the endobiotic system. Comparison with other congeneric fungi reported on Agropyron repens reveals the Michigan fungus to be distinct from them. Whether it can be embraced within Physoderma graminis (Biisgen) de Wild. or other described taxa on grasses awaits the results of future cross-inoculation studies. OF THE several species of Physoderma which have been found on grasses, that parasitizing Agropyron repens (L.) Beauv. has been commonly ascribed to P. graminis (Biisgen) De Wild. Whether one can agree with the various observers of "P. graminis," including those reporting it from Agropyron repens, that they were all, in fact, dealing with the same species seems open to question. The species name "graminis" was first applied by 1

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Sexuality in Physoderma Pulposum Wallroth

Cited by 7 publications

References 7 publications

A new flagellated dispersion stage in Paraphysoderma sedebokerense, a pathogen of Haematococcus pluvialis

A new flagellated dispersion stage in Paraphysoderma sedebokerense, a pathogen of Haematococcus pluvialis

Zoosporic fungi from Tunisia, and the Seychelles Islands (Indian Ocean)

Observations on Chytridiaceous Parasites of Phanerogams. Xi. A Physoderma on Agropyron Repens

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