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Title: GENERA OF THE DIAPORTHALES: DIAPORTHOPSIS

Author
item Castlebury, Lisa
item Farr, David
item Rossman, Amy
item JAKLITSCH, WALTER - VIENNA, AUST

Submitted to: Mycoscience
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/3/2003
Publication Date: 6/20/2003
Citation: Castlebury, L.A., Farr, D.F., Rossman, A.Y., Jaklitsch, W. 2003. Genera of the diaporthales: diaporthopsis. Mycoscience. Vol.44(3)pp.203-208,2003.

Interpretive Summary: Among fungi in the chestnut blight order, species are not always grouped in a way that reflects their evolutionary history. As a result their scientific names do not serve as the basis for predicting the behavior of these species especially their pathogenicity. This is important for determining which fungi may cause plant diseases. A fungal species, Diaporthopsis angelicae, occurs on plants in the Apiaceae (celery family) and is representative of all species in the genus Diaporthopsis. Based on both the microscopic appearance and molecular characters, D. angelicae was determined to be part of the large genus Diaporthe and was transferred to that genus. In addition, D. angelicae is described and illustrated. Based on this research, plant pathologists will be able to identify D. angelicae and are alerted to the fact that this fungus may cause a disease of plants in the celery family.

Technical Abstract: The genus Diaporthopsis was described for species that are similar to Diaporthe but have non-septate ascospores. The type species of Diaporthopsis is D. angelicae, an earlier name for D. nigrella. Molecular analysis of the large subunit of the ribosomal nuclear DNA places D. angelicae within a group that includes the type and many other species of Diaporthe. In addition, D. angelicae is similar in stromatal, perithecial, and centrum morphology to other species of Diaporthe. Based on morphological and molecular data Diaporthopsis angelicae is transferred to Diaporthe and the genus Diaporthopsis is considered a synonym of Diaporthe. A description and illustrations of D. angelicae are presented.