Japanese Fungi on Plants No.50 before next top

Puccinia graminis Pers.:Pers. subsp. graminis Cummins
 Classification: Basidiomycota, Urediniomycetes, Uredinales, Pucciniaceae

 Distributed widely in Japan. Causes stem rust of the gramineous plants of more than 12 genera such as wheat, barley, oat, rye, couch grass and brome, producing uredospores and teliospores on the hosts. Spermogonial and aecial stages are produced on the Berberis plants such as B. vulgaris L. Disperses by scattering uredospores and overwinter by teliospores. Never grow on aritificial media.

Characteristics: Plant pathogen

Morphology:
 Spermogonial stage:  
 Aecial stage: Aeciospores produced in aecia, globose to rather ellipsoid, cell walls thick at the apical side, verrucose, 16-23 x 15-19 in size.
 Uredial stage: Uredospores produced in uredinia, ellipsoid to oblong, echinulate, yellow brown to goldennut brown, 22-45 x 13-24 um, the apex thicker, germ pores 3-5 aequatorial.
 Teleuto stage: Teliospores oblong to narrowly obovoid, light brown to brown, (1-)2(-3) celled, 33-66 x 13-23 um, pedicels narrow, cell walls 7-10 um thick at the apical side.
Uredospores Teliospores

Herbarium specimen in NIAES

Specimen No. Scientific name Host name Host scientific name Symptoms Geographical origin Collected date Collector
103-1-32 Puccinia graminis subsp. graminis Wheat Triticum aestivum Stem rust Hakozaki, Fukuoka 1930.5 Kawamura, E.
103-1-33 " " " " Kamo, Shimane 1932.5.27 Yokogi
103-1-31 " " " " Kounosu, Saitama 1940.7.19
103-2-21 " Barley Hordeum vulgare " Fukuoka 1940.7.19 Kawamura, E.
108-1-56 " Timothy Phleum pratense " Iwamizawa, Hokkaido 1941.8.7

(Described by Tsukiboshi, T., NIAES, Microbial Systemtics Lab., 2002)


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