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PLoS One

Title:		Blue light acts as a double-edged sword in regulating sexual development of Hypocrea jecorina (Trichoderma reesei)
Author(s):		Chen CL; Kuo HC; Tung SY; Hsu PW; Wang CL; Seibel C; Schmoll M; Chen RS; Wang TF;
Address:		"Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan"
Journal Title:		PLoS One
Year:		2012
Volume:		20120918
Issue:		9
Page Number:		e44969 -
DOI:		10.1371/journal.pone.0044969
ISSN/ISBN:		1932-6203 (Electronic) 1932-6203 (Linking)
Abstract:		"The industrially important cellulolytic filamentous fungus Trichoderma reesei is the anamorph of the pantropical ascomycete Hypocrea jecorina. H. jecorina CBS999.97 strain undergoes a heterothallic reproductive cycle, and the mating yields fertilized perithecia imbedded in stromata. Asci in the perithecia contain 16 linearly arranged ascospores. Here, we investigated H. jecorina sexual development under different light regimes, and found that visible light was dispensable for sexual development (stroma formation and ascospore discharge). By contrast, constant illumination inhibited stroma formation, and an interruption of the darkness facilitated timely stroma formation in a 12 h/12 h light-dark photoperiod. The results of genetic analyses further revealed that H. jecorina blue-light photoreceptors (BLR1, BLR2) and the photoadaptation protein ENV1 were not essential for sexual development in general. BLR1, BLR2 and ENV1 are orthologues of the conserved Neurospora crassa WC-1, WC-2 and VVD, respectively. Moreover, BLR1 and BLR2 mediate both positive and negative light-dependent regulation on sexual development, whereas ENV1 is required for dampening the light-dependent inhibitory effect in response to changes in illumination. Comparative genome-wide microarray analysis demonstrated an overview of light-dependent gene expression versus sexual potency in CBS999.97 (MAT1-2) haploid cells. Constant illumination promotes abundant asexual conidiation and high levels of hpp1 transcripts. hpp1 encodes a h (hybrid)-type propheromone that exhibits features of both yeast a and a pheromone precursors. Deletion of hpp1 could rescue stroma formation but not ascospore generation under constant illumination. We inferred that the HPP1-dependent pheromone signaling system might directly prevent stroma formation or simply disallow the haploid cells to acquire sexual potency due to abundant asexual conidiation upon constant illumination"
Keywords:		"Color Fungal Proteins/metabolism Genome, Fungal/genetics Hypocrea/genetics/metabolism/*physiology/*radiation effects *Light Mutation Spores, Fungal/genetics/metabolism/*physiology/*radiation effects Time Factors Transcription, Genetic/radiation effects;"
Notes:		"MedlineChen, Chia-Ling Kuo, Hsiao-Che Tung, Shu-Yu Hsu, Paul Wei-Che Wang, Chih-Li Seibel, Christian Schmoll, Monika Chen, Ruey-Shyang Wang, Ting-Fang eng Research Support, Non-U.S. Gov't 2012/10/03 PLoS One. 2012; 7(9):e44969. doi: 10.1371/journal.pone.0044969. Epub 2012 Sep 18"