Volume 8 - Issue 5 (SI Diaporthe)


Article Number 1
Title

Diaporthe species on Rosaceae with descriptions of D. pyracanthae sp. nov. and D. malorum sp. nov.

Authors

Santos L, Phillips AJL, Crous P, Alves A

Received 24 January 2017
Accepted 03 March 2017
Published Online 12 March 2017
Corresponding Author Artur Alves – artur.alves@ua.pt
Abstract

The family Rosaceae includes a large number of species ranging from herbaceous (Fragaria) to ornamental plants (Rosa and Pyracantha) and fruit trees (Malus and Pyrus). Diaporthe species have been associated with twig canker, shoot blight, dieback, wood decay and fruit rot on members of the Rosaceae. In this study a collection of isolates from several Rosaceae hosts were characterised by multi-locus sequence analyses using the internal transcribed spacer, translation elongation factor 1-alpha, beta-tubulin, histone H3 and calmodulin loci. The phylogenetic analyses of the combined five loci revealed that the isolates studied were distributed among four clades, of which two correspond to D. foeniculina and D. eres. The other two clades, closely related to D. passiflorae and D. leucospermi represent two new species, D. pyracanthae sp. nov. and D. malorum sp. nov., respectively. Further, pathogenicity assays have shown that of the four species tested, D. malorum was the most aggressive species on apple fruit and D. eres was the most aggressive species on detached pear twigs. A revision of all Diaporthe (and Phomopsis) names that have been associated with Rosaceae hosts as well as their current status as pathogens of members of this family is presented.

Keywords Malus – Pathogenicity – Phylogeny – Pyracantha – Pyrus
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Article Number 2
Title

Diaporthe species associated with peach tree dieback in Hubei, China

Authors

Dissanayake AJ, Zhang W, Liu M, Hyde KD, Zhao W, Li XH, Yan JY

Received 26 February 2017
Accepted 05 March 2017
Published Online 03 April 2017
Corresponding Author J.Y. Yan – jiyeyan@vip.163.com, X.H. Li – lixinghong1962@163.com
Abstract

Peach tree diseases have a variety of symptoms and causes. Only Botryosphaeriaceae taxa have been reported in association with peach trees in Chinese peach orchards. This study aims to identify and characterize Diaporthe species associated with peach trees in Jinshui Experimental Orchard in Hubei Academy of Agriculture Sciences, Hubei Province, China. The fungi were isolated from diseased peach trunks and shoots showing exudates. Fungal identification was accomplished using a combination of morphological and pathogenic characteristics together with phylogenetic analyses based on internal transcribed spacer (ITS), partial translation elongation factor 1-α (EF1-α), β-tubulin (BT) and calmodulin (CAL) sequences. A total of 48 Diaporthe isolates were obtained from 62 diseased samples and most isolates were identified as Diaporthe eres (69 %), followed by D. momicola sp. nov (12.5 %), D. pescicola sp. nov. (10 %) and D. taoicola sp. nov. (8.5 %). All identified species were able to cause necrotic lesions at different levels of severity when inoculated into detached peach shoots.

Keywords Diaporthaceae – Morphology – Multi-gene phylogeny – Pathogenicity – Prunus persica – Taxonomy
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