AMC 2019

Poster Presentation 3

P3-26 Fungi in Chiang Mai province, Thailand Sukanya Haituk, Ratchadawan Cheewangkoon, Panatda Kankavee Department of Entomology and Plant pathology, Faculty of Agriculture, Mai University, Thailand

Rust fungi (, ) consist of the most rich group of obligate, plant pathogenic fungi. They include many important plant pathogens. These fungi have unique systematic characteristics which differ from all fungal groups. Therefore, this study aims to identify and observe the critical morphology of these fungi in Chiang Mai province. Fifty symptomatic samples of rust fungi characterized by different pustules and rusty yellow spores occurring on various plants in Chiang Mai, Thailand, were collected during March 2015 to March 2016. Microscopic features of pustules, uredium, urediniospores, telium and teliospores for all specimens were examined using the stereo and compound microscopes. Slides were preserved in lactic acid. Results revealed that symptoms appeared on host plants as bright yellow or yellow-orange powdery sori on the upper and lower leaf surface. Pustules, occurring on round to ellipsoidal necrotic spots up to 1-3 mm diam., were erumpent, and ranged from yellow to orange or brown to dark brown. Rust caused by uredinium and telium was small, bright yellow or yellow-orange, pale brown to brown or hyaline. Urediniospores were ellipsoidal, subglobose or obovoid, yellow to pale yellowish brown, echinulate or verrucose. Teliospores were characterized by 2 celled-spores divided by a horizontal septum, with each cell being echinulate and having a germ pore and pigmented wall. The rust fungi were identified morphologically and divided into six families, namely, Pucciniaceae, Coleosporiaceae, , Sphaerophragmiaceae and Uropyxidaceae. Ten genera were identified, including, Aecidium, Crossopsora, , Hemileia, Phakopsora, Puccinia, , Nyssopsora, Tranzschelia, and Sphaerophragmium.

Keywords: Rust fungi Pucciniales morphology and Chiang Mai Province

Asian Mycological Congress 2019