Abstract
During studies of microfungi on para rubber in Thailand, we collected a new Coryneum species on twigs which we introduce herein as C.heveanum with support from phylogenetic analyses of LSU, ITS and TEF1 sequence data and morphological characters. Coryneumheveanum is distinct from other known taxa by its conidial measurements, number of pseudosepta and lack of a hyaline tip to the apical cell.
Highlights
The para rubber tree (Hevea brasiliensis) is a tropical plant belonging to family Euphorbiaceae (Priyadarshan et al 2009)
Bayesian posterior probabilities (BY) from MCMC were evaluated with the final average standard deviation of split frequencies = 0.005452
The phylogeny shows that Coryneum heveanum forms a distinct lineage in Coryneum with strong support (94% maximum likelihood (ML), 95%maximum parsimony (MP) and 1.00 BY) and in a sister clade to C. umbonatum, C. depressum, C. modonium, C. perniciosum and C. castaneicola
Summary
The para rubber tree (Hevea brasiliensis) is a tropical plant belonging to family Euphorbiaceae (Priyadarshan et al 2009). The total para rubber tree plantation area in South East Asia exceeds more than 5 million hectares (Vongkhamheng et al 2016). In Thailand, para rubber tree plantation area covers more than 3 million hectares and this number has increased every year (Kromkratoke and Suwanmaneepong 2017, Romyen et al 2018). This important perennial crop is currently often affected by plant pathogenic fungi which can substantially decrease the quality and quantity of rubber yield (Liu et al 2018). The main objective of our project is to survey and study the diversity of microfungi associated with para rubber trees in Thailand. This work is based on a combination of morphology and molecular data for identification this taxon
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