Magnapothe grisea (Japanese Fungi on Plants)

Japanese Fungi on Plants No.40 before next top

Magnapothe grisea (Hebert) Barr [Pyricularia grisea (Cooke) Sacc.]
Classification: Ascomycota, Locuoascomycetes, Dothideales, Hysteriaceae

Distributed widely in Japan. Causes blast of rice and the damage is very severe. Often isolated from other gramineous crops and weeds. Disperses by scattering conidia. Teleomorph rarely observed in nature.

Characteristics: Plant pathogen Symptom: JPEG (Guinea grass, inoculated, 115kb)

		Morphology: Teleomorph: Produced by paired culture on artificial media. Perithecia dark brown to black with cylindrical ostiolar neck, producing cylindrical to subclavate asci inside. Ascospores hyaline, fusiform, slightly curved, 17-21 x 5-7 um with 2-3 septa. Anamorph: On pale brown conidiophores, producing conidia hyaline to pale olive brown, obpyriform, hilum protrudent, 17-28 x 6-9 um with 1-3 septa.
Conidia

Herbarium specimen in NIAES

Specimen No.	Scientific name	Host name	Host scientific name	Symptoms	Geographical origin	Collected date	Collector
113-1-83	Pyricularia grisea	Southrern crab grass	Digitaria adscendens	Blast	Shimosoga, Kanagawa	1928.7.27	Tasugi, H.
113-1-84	"	"	"	"
113-1-88	"	"	"	"	Yasuoka, Yamaguchi	1932.7.22
242-1-2	"	"	"	"	Matsudo, Chiba	1931.9.21
242-1-7	"	"	"	"	Chiba	1931.7.27
242-1-8	"	"	"	"	Inba, Chiba	"
242-1-9	"	"	"	"	Chiba	"
242-1-31	"	"	"	"	Inba, Chiba	"
242-1-39	"	"	"	"	Chiba	"
251-2-46	"	Southrern crab grass?	Digitaria adscendens?	"	Higashiibaraki, Ibaraki	1927.8.16	Kawashima, E.
251-2-48	"	"	"	"	Iwamatsu, Shizuoka	1928.8.15	Tasugi, H.
251-2-49	"	"	"	"	Higashiibaraki, Ibaraki	1928.8.16	Kawashima, E.

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