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Title:   Author  item
                                            Goodwin, Stephen

                                                         - *Steve*item
                                            ZISMANN, VICTORIA - FORMERLY USDA-ARS
  Submitted to: Phytopathology
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 3/30/2000
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Septoria passerinii, the cause of barley speckled leaf blotch, has no known teleomorph.  It probably is related to other fungi with a Septoria anamorph, such as the septoria tritici blotch pathogen of wheat, Mycosphaerella graminicola.  To test whether S. passerinii is related to M. graminicola, their ITS sequences were compared.  Six  isolates of S. passerinii from Hordeum vulgare shared the same 569 bp sequence.  One morphologically identical isolate from H. jubatum had a 569 bp sequence that differed from the H. vulgare-isolate sequence by 7 bp.  The ITS sequence of M. graminicola differed from those of both forms of S. passerinii by 10 bp.  All three ITS sequences could be distinguished by restriction enzyme digestion of PCR products.  ITS sequences were obtained from additional species of Mycosphaerella and/or were downloaded from GenBank.  A neighbor-joining tree revealed  that both forms of S. passerinii were closely related to M. graminicola and clustered within a monophyletic group of Mycosphaerella species.  Thus, if S. passerinii has a teleomorph, it probably is a Mycosphaerella.  The isolate from H. jubatum may represent a new, undescribed sibling species of Septoria.


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