Abstract

OSORIO-CONCEPCION, Macario; CASAS-FLORES, Sergio  and  CORTES-PENAGOS, Carlos. The influence of phosphate limitation on conidiation in Trichoderma atroviride and light blind mutants. Rev. Mex. Mic [online]. 2013, vol.37, pp.41-50. ISSN 0187-3180.

Molecular events associated with photoconidiation of Trichoderma are regulated by the BLR-1 and BLR-2 protein complex, where the first plays an essential role as sensor, and both function as a transcriptional factor. Null mutant strains of blr genes in T. atroviride are unable to respond to light stimulation and are then considered blind mutants. Limited concentration of essential nutrients in the media is a condition that triggers conidiation in T. atroviride. In the present study we show the influence of limited concentration of inorganic phosphate (Pi) in the media on photoconidiation in T. atroviride and two blr null mutants. All strains tested showed the development of conidial structures when low levels of Pi (0.1 mM) were present in the absence of light. The data showed that sensing environmental cues such as phosphate limitation is independent of BLR proteins pathway.

Keywords : Hypocrea; blr mutants; nutrition; morphogenesis; sporulation.

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