Two novel species and a new host record of Alternaria (Pleosporales, Pleosporaceae) from sunflower (Compositae) in Myanmar

By

Nwe, Zin Mar
Htut, Khin Nayyi
Aung, Sein Lai Lai
Gou, Ya Nan
Huang, Cheng-Xin
Deng, Jian Xin

Type

Article

Date of Publication

2024

Original Publication

MycoKeys

Volume

105

Pages

337--354

Subjects

Alternaria , Morphology , new host record , novel species , Phylogeny

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers 2011-

Identifiers

DOI: https://doi.org/10.3897/mycokeys.105.123790

 

Abstract

Sunflower (Helianthus annuus L.) is a widely cultivated, fast-growing crop known for its seeds and oil, with substantial ecological and economic importance globally. However, it faces challenges from leaf diseases caused by Alternaria species, which threaten its yield. Three small-spored Alternaria species were isolated from leaf spot and blight symptoms on sunflower in Myanmar. All the species were determined based on morphological characterization and a multi-locus phylogenetic assessment of seven genes, including the internal transcribed spacer of rDNA region (ITS), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), RNA polymerase second largest subunit (RPB2), translation elongation factor 1-α (TEF1), Alternaria major allergen gene (Alt a 1), endopolygalacturonase gene (EndoPG), and an anonymous gene region (OPA10-2). The results introduced two new Alternaria species, A. myanmarensissp. nov. and A. yamethinensissp. nov., and a known species of A. burnsii, firstly reported from sunflower.