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Abstract Detail

Poster Session

Rollins, Jeff [1], Benny, Ulla [1], Chamuscho , Karen [1], Veluchamy, Selva  [1].

Photoresponses of apothecial stipes and photomorphogenesis of apothecial discs in Sclerotinia sclerotiorum.

Sexual fruiting body development of Ascomycota fungi represents a complex coordination of ascogenous and vegetative hyphal systems.  The determination of final shape and form is canalized through genetic regulatory pathways but the process remains responsive to environmental cues to ensure proper developmental timing.  Towards the goal of understanding the interplay of these forms of regulation, we have begun studies to identify and characterize regulators of the photo-responsive sexual fruiting body (apothecium) development in Sclerotinia sclerotiorum (Lib.) de Bary.  A study of undifferentiated apothecial stipe photoresponses has revealed positive and negative phototropism mediated by UV-A and red wavelengths of light respectively.  De-etiolation of stipes without differentiation is mediated by blue light wavebands and disc morphogenesis is regulated by high fluence rates of UV-A.  The S. sclerotiorum genome sequence encodes twelve putative photoreceptors spanning the UV to red wavebands of predicted light responsiveness.  Functional characterization of putative UV-A and blue light receptors have not revealed functions in observed photoresponses but instead affect the prerequisite sclerotial state of development.  Parallel studies have revealed stage-specific developmental consequences of light deprivation that appear to reprogram tissues from a determined state to a more basal multipotent state of development.  A number of experimental approaches including targeted gene deletions, random tagged mutagenesis and transcriptomic analyses are being used to refine our understanding of this complex, multicellular development and test hypotheses relating to pattern development and tissue determinacy in Ascomycota fruiting body development.

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Related Links:
Sclerotinia Resource Page

1 - University of Florida, Plant Pathology, 1453 Fifield Hall, Gainesville, FL, 32611-0680, USA


Presentation Type: Offered Paper - Poster
Session: P2
Location: Lincoln Room/Kellogg Hotel and Conference Center
Date: Tuesday, June 10th, 2014
Time: 8:00 PM
Number: P2003
Abstract ID:89
Candidate for Awards:None

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