Abstract
Draft genome sequences of five Calonectria species [including Calonectria aciculata, C. crousiana, C. fujianensis, C. honghensis and C. pseudoturangicola], Celoporthe dispersa, Sporothrix phasma and Alectoria sarmentosa are presented. Species of Calonectria are the causal agents of Eucalyptus leaf blight disease, threatening the growth and sustainability of Eucalyptus plantations in China. Celoporthe dispersa is the causal agent of stem canker in native Syzygium cordatum and exotic Tibouchina granulosa in South Africa. Sporothrix phasma was first discovered in the infructescences of Protea laurifolia and Protea neriifolia in South Africa. Alectoria sarmentosa is fruticose lichen belongs to the alectorioid clade of the family Parmeliaceae. The availability of these genome sequences will facilitate future studies on the systematics, population genetics, and genomics of these fungi.
Highlights
Species in the genus Calonectria have a global distribution, in tropical and subtropical regions of the world (Lombard et al 2010c)
The tef1 gene from the PCR products confirmed the five Calonectria species, and a phylogenetic tree based on the four gene regions reflecting the position of these five species in relation to other Calonectria species was produced (Fig. 1)
Pathogenicity trials conducted on E. grandis and T. granulosa showed that C. dispersa is pathogenic on both hosts, highlighting that C. dispersa could threaten commercial grown Eucalyptus trees in South Africa (Nakabonge et al 2006)
Summary
The advent of DNA sequencing has advanced our understanding on biodiversity research (Bik et al 2012). The analyses of single and mutlilcous datasets in phylogenetic frameworks are frequently used for biodiversity assessment These belong to a small portion of a genome and may bias the accurate species assessment. While the molecular studies based on single and multicolus dataset have revolutionized our understanding of species delimitations in lichen-forming fungi, the application of small portion of genome may obscure the accurate cryptic biodiversity assessment. We sequenced metagenome of holobiont of a lichen species Alectoria sarmentosa (Parmeliaceae, Ascomycota) to advance biodiversity research. Alectoria sarmentosa is fruticose lichen belongs to the alectorioid clade of the family Parmeliaceae (Divakar et al 2015) It is distinguished in having pendent, yellow to greenish grey thallus, pseudocyphellae fusiform, soralia rare and tuberculate (Brodo and Hawksworth 1977).
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