Journal
FUNGAL GENETICS AND BIOLOGY
Volume 44, Issue 12, Pages 1368-1379Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.fgb.2007.07.007
Keywords
L-arginme; carbamoyl-phosphate synthase; conidiation; Coniothyrium minitans; filamentous fungi; nitric oxide; NO signal transduction pathway; Sclerotinia sclerotiorum
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Conidiation is important in the life cycles of mitosporic fungi for survival and transmission. A full-length cDNA of one gene named CMCPS1 encoding L-arginine-specific carbarnoyl-phosphate synthase was obtained from Coniothyrium minitans, a sclerotial parasite of the plant pathogenic fungus Sclerotinia sclerotiorum. T-DNA insertional disruption of CMCPS1 resulted in conidiation deficiency of mutant ZS-1T2029, and this was confirmed with the RNAi technique. The phenotype was restored by complementation with L-arginine, and the effect Of L-arginine on conidiation may be mediated by nitric oxide, which is catalyzed by nitric oxide synthase (NOS). Conidiation of ZS-1T2029 was restored by sodium nitroprussiate, a NO donor; and conidiation of wild type strain ZS-1 could be suppressed by L-NAME, an inhibitor of NOS. The highest amount of NO in mycelia was detected at an early stage of conidiation (72 hpi) in liquid shake culture medium. Staining with the NO-sensitive fluorescent probe, DAF-FM DA, gave strong fluorescent signals in primordia and young pycnidia. This work presents the first report that L-arginine is involved in conidiation of C minitans, and the possibility Of L-arginine-derived nitric oxide-mediated conidiation among fungi and possible modes of action are discussed. (c) 2007 Elsevier Inc. All rights reserved.
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