New Leptographium species from Indonesia and Eastern North America

Jacobs, Karin; Wingfield, Michael J.; Bergdahl, D. R.

doi:10.1007/bf02460926

Cited by 11 publications

(6 citation statements)

References 34 publications

(36 reference statements)

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“…This species grouped closest to L. pineti , which was described from the gallery of an Ips sp. under the bark of Pinus merkusii growing on the island of Sumatra, Indonesia ( Jacobs et al 2000 ). The fact that no isolates were obtained from beetles might indicate that this species is a preferential symbiont of mites.…”

Section: Discussionmentioning

confidence: 99%

Ophiostomatoid fungi associated with conifer-infesting beetles and their phoretic mites in Yunnan, China

Chang¹,

Duong²,

Taerum³

et al. 2017

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The Ophiostomatales is an Ascomycete order of fungi that accommodates several tree pathogens and many species that degrade wood. These fungi are commonly vectored by Scolytine bark and ambrosia beetles. In recent years it has also been shown that hyperphoretic mites on these beetles can vector some Ophiostomatales. Little is known regarding the Ophiostomatales in China and we have consequently explored the diversity of these fungi associated with conifer-infesting beetles and mites in Yunnan province. Galleries and beetles were collected for 17 beetle species, while 13 mite species were obtained from six of these beetle species. Collectively, 340 fungal isolates were obtained, 45 from beetles, 184 from mites, 56 from galleries and 55 isolates where the specific niche was not clear. DNA sequences for five gene regions (ITS, LSU, BT, EF, and CAL) were determined for fungal isolates representing different morphological groups. Phylogenetic analyses confirmed the presence of 19 fungal taxa, including five novel species described here as Ophiostoma acarorum sp. nov., Ophiostoma brevipilosi sp. nov., Graphilbum kesiyae sp. nov., Graphilbum puerense sp. nov., and Leptographium ningerense sp. nov. Ophiostoma ips was the most frequently isolated species, representing approximately 31% of all isolates. Six of 19 taxa were present on mites, beetles and in the galleries of the beetles, while three species were found on mites and galleries. Two species were found only on mites and one species only on a beetle. Although the numbers of beetles and mites were insufficient to provide statistical inferences, this study confirmed that mites are important vectors of the Ophiostomatales in China. We hypothesize that these mites are most likely responsible for horizontal transfer of fungal species between galleries of different beetle species. The fact that half of the fungal species found were new to science, suggests that the forests of east Asia include many undescribed Ophiostomatales yet to be discovered.

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Section: Discussionmentioning

confidence: 99%

Ophiostomatoid fungi associated with conifer-infesting beetles and their phoretic mites in Yunnan, China

Chang¹,

Duong²,

Taerum³

et al. 2017

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“…This is because the fungus was first described from a conifer ( Pinus merkusii ) infested by an Ips sp. in Sumatra, Indonesia ( Jacobs et al 2000a ), which is geographically close to China. The discovery of L. pineti on P. kesiya in China suggests that it has a relatively wide host range on Pinus spp.…”

Section: Discussionmentioning

confidence: 99%

Eight new <I>Leptographium</I> species associated with tree-infesting bark beetles in China

Paciura

Beer²,

Jacobs³

et al. 2010

Pers - Int Mycol J

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Leptographium spp. are anamorphs of Grosmannia residing in the order Ophiostomatales. These fungi are typically associated with bark-beetles and are common causal agents of sapstain in lumber and some are important tree pathogens. In this study, Leptographium spp. associated with bark beetles collected during a survey in Jilin and Yunnan provinces of China, were identified. Identifications were achieved using comparisons of morphological characters and DNA sequence data for the ITS2-partial LSU rDNA region, as well as the β-tubulin and EF-1α gene regions. Eight unknown species of Leptographium are recognised and described from conifer and hardwood hosts, associated with beetles including Ips subelongatus, Tomicus yunnanensis, Hylurgops minor, Polygraphus verrucifrons and a Pissodes sp. Six of the new species are morphologically and phylogenetically related to species known to occur in Asia such as G. yunnanense, L. bhutanense, L. bistatum and L. sinoprocerum. The remaining two taxa are related to those in a group containing G. americana and L. abietinum, found in North America. This study also provides the first report of L. pineti on Pinus kesiya in China.

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“…Leptographium profanum can easily be distinguished from L. peucophilum based on the length of the conidiophores. Leptographium profanum has conidiophores that are on average twice as long as those of L. peucophilum (Jacobs et al 2001b). Ecologically, L. profanum and L. peucophilum share some characteristics (Jacobs et al 2001b).…”

Section: Discussionmentioning

confidence: 95%

“…Leptographium profanum has conidiophores that are on average twice as long as those of L. peucophilum (Jacobs et al 2001b). Ecologically, L. profanum and L. peucophilum share some characteristics (Jacobs et al 2001b). Both species are associated with the roots of trees.…”

Section: Discussionmentioning

confidence: 95%

Leptographium profanumsp.nov., a new species from hardwood roots in North America

2006

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Species of Leptographium are anamorphs of Ophiostoma and best known as associates of tree-infesting bark beetles. The majority of these fungi and their insect associates are found on conifers where they typically cause sap-stain of lumber. A small number of species are also known as tree pathogens. Relatively few Leptographium species are found on angiosperm trees. Species described from these niches have increased in recent years. The objective of this study was to characterize a Leptographium species isolated from the roots of various hardwood trees in the southeastern United States. Morphology of this fungus differed from that of other Leptographium species. Comparisons of DNA sequences for part of the ITS2-28S ribosomal DNA region, the b-tubulin, and the elongation 1-a gene regions also showed that this fungus represents an undescribed taxon. The fungus is thus described as Leptographium profanum sp.nov.Résumé : Les espèces de Leptographium sont des anamorphes des Ophiostoma et mieux connus comme associés aux scolytes qui infectent les arbres. La majorité de ces champignons et de leurs insectes associés, se retrouvent chez les conifères où ils causent typiquement la tache colorée de l'aubier. Un petit nombre d'espèces sont également connues comme pathogènes des arbres. On trouve relativement peu de Leptographium espèces chez les angiospermes. Les espèces décrites pour ces niches ont augmenté au cours des récentes années. L'objectif de cette étude est de caractériser un Leptographium espèce isolé des racines de diverses espèces d'arbres à bois franc, du sud-est des É tats-Unis. La morphologie de ce champignon diffère de celle des autres Leptographium spp. Les comparaisons des séquences d'ADN pour une partie de la région de l'ADN ribosomal ITS2-28S, ainsi que les régions de la b-tubuline et du gène d'élongation 1-a, montrent que ce champignon représente un taxon jamais décrit. On décrit ce champignon comme Leptographium profanum sp.nov.

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New Leptographium species from Indonesia and Eastern North America

Cited by 11 publications

References 34 publications

Ophiostomatoid fungi associated with conifer-infesting beetles and their phoretic mites in Yunnan, China

Ophiostomatoid fungi associated with conifer-infesting beetles and their phoretic mites in Yunnan, China

Eight new <I>Leptographium</I> species associated with tree-infesting bark beetles in China

Leptographium profanumsp.nov., a new species from hardwood roots in North America

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