Inhibitory Effects of Light on Ascospore Germination of Pseudoarachniotus marginosporus

Bragg, Jimmy D.

doi:10.2307/3759494

Cited by 2 publications

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“…Size and shape of ascospores affect their properties both regarding abiotic and biotic dispersal, and pigmentation appears to be a means of protection against UV radiation (Shields et al . 1961; Durrell 1964; Bragg 1981; Roper et al . 2008).…”

Section: Introductionmentioning

confidence: 99%

“…However, there is evidence that invertebrates play a role in the dispersal of ascospores and other lichen propagules (Pyatt 1968c;Gerson 1973;Bailey 1976;Sipman 1983;Lorentsson & Mattsson 1999;Leal & Oliveira 2000;Dyer & Letourneau 2007). Size and shape of ascospores affect their properties both regarding abiotic and biotic dispersal, and pigmentation appears to be a means of protection against UV radiation (Shields et al 1961;Durrell 1964;Bragg 1981;Roper et al 2008). Tropical crustose lichens have a marked tendency to form large and often pigmented ascospores with either thick walls and septa or with muriform cell division (Sipman & Harris 1989;Aptroot 1991;Staiger 2002;Frisch et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Ascospore ontogeny and discharge in megalosporousTrypetheliaceaeandGraphidaceae(Ascomycota: Dothideomycetes and Lecanoromycetes) suggest phylogenetic relationships and ecological constraints

Sweetwood

Lücking²,

Nelsen

et al. 2012

The Lichenologist

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AbstractWe studied ascospore dispersal and ontogeny in several species ofTrypetheliaceaeand one species ofGraphidaceaewith megalosporous (very large) ascospores, includingAptrootia terricola(Aptroot) Lücking, Umaña & Chaves,Architrypethelium nitens(Fée) Aptroot,A. seminudum(Mont.) Aptroot,Astrothelium diplocarpoidesMüll. Arg.,Laurera gigantospora(Müll. Arg.) Zahlbr., andOcellularia subpraestansHale. Although mature ascospores are very different among species ofTrypetheliaceae, all species studied share plesiomorphic ontogenetic features such as the formation of a single central euseptum and subsequent development of a variable number of transverse distosepta with diamond-shaped lumina (astrothelioid ascospore type). Even the dark brown, richly muriform ascospores ofAptrootia terricolago through an astrothelioid stage. This suggests that ascospore types may be more closely related than suggested by their mature morphology, and could explain why related taxa can develop markedly different ascospore types. We discuss the implications for systematic classification ofTrypetheliaceaein the light of recent molecular studies, and also speculate about the ecological importance of large ascospores, especially with muriform septation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ascospore ontogeny and discharge in megalosporousTrypetheliaceaeandGraphidaceae(Ascomycota: Dothideomycetes and Lecanoromycetes) suggest phylogenetic relationships and ecological constraints

Sweetwood

Lücking²,

Nelsen

et al. 2012

The Lichenologist

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Light inhibits spore germination through phytochrome in Aspergillus nidulans

2013

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Aspergillus nidulans responds to light in several aspects. The balance between sexual and asexual development as well as the amount of secondary metabolites produced is controlled by light. Here, we show that germination is largely delayed by blue (450 nm), red (700 nm), and far-red light (740 nm). The largest effect was observed with far-red light. Whereas 60 % of the conidia produced a germ tube after 20 h in the dark, less than 5 % of the conidia germinated under far-red light conditions. Because swelling of conidia was not affected, light appears to act at the stage of germ-tube formation. In the absence of nutrients, far-red light even inhibited swelling of conidia, whereas in the dark, conidia did swell and germinated after prolonged incubation. The blue-light signaling components, LreA (WC-1) and LreB (WC-2), and also the cryptochrome/photolyase CryA were not required for germination inhibition. However, in the phytochrome mutant, ∆fphA, the germination delay was released, but germination was delayed in the dark in comparison to wild type. This suggests a novel function of phytochrome as far-red light sensor and as activator of polarized growth in the dark.

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Inhibitory Effects of Light on Ascospore Germination of Pseudoarachniotus marginosporus

Cited by 2 publications

References 0 publications

Ascospore ontogeny and discharge in megalosporousTrypetheliaceaeandGraphidaceae(Ascomycota: Dothideomycetes and Lecanoromycetes) suggest phylogenetic relationships and ecological constraints

Ascospore ontogeny and discharge in megalosporousTrypetheliaceaeandGraphidaceae(Ascomycota: Dothideomycetes and Lecanoromycetes) suggest phylogenetic relationships and ecological constraints

Light inhibits spore germination through phytochrome in Aspergillus nidulans

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