scholarly journals (2609–2613) Proposals to conserve Amorphotheca resinae against Cladosporium avellaneum, Ditiola mucida (Holwaya mucida) against Acrospermum caliciiforme (Crinula caliciiformis), Lophodermium seditiosum against Leptostroma austriacum, Pezicula sporulosa against Gloeosporium longisporum (Cryptosporiopsis longispora), and Tapesia yallundae (Oculimacula yallundae) against Cercosporella herpotrichioides (Pseudocercosporella herpotrichioides) (Ascomycota: Leotiomycetes)

Taxon ◽  
2018 ◽  
Vol 67 (3) ◽  
pp. 636-638
Author(s):  
Amy Y. Rossman ◽  
W. Cavan Allen ◽  
Lisa Castlebury ◽  
Keith Seifert ◽  
Gerard Verkley
Keyword(s):  
Tapesia Yallundae ◽  
Oculimacula Yallundae

scholarly journals Distinguishing isolates of cereal stem disease pathogens of the genus Tapesia from isolates of Fusarium and Rhizoctonia using the RAPD method

2000 ◽  
Vol 36 (No. 4) ◽  
pp. 132-140
Author(s):  
P. Vejl ◽  
S. Skupinová ◽  
I. Polišenská ◽  
M. Váňová
Keyword(s):  
Triticum Aestivum ◽  
Triticum Aestivum L ◽  
Fusarium Avenaceum ◽  
The Czech Republic ◽  
Tapesia Yallundae ◽  
Random Amplification ◽  
High Degree ◽  
Rhizoctonia Cerealis ◽  
Species Variability ◽  
Rapd Method

The RAPD method (Random Amplification of Polymorphous DNA) was used to distinguish Tapesia acufonnis and T. yallundae isolates from other pathogens of wheat stem base diseases (Fusarium avenaceum, F. culmorum, F. nivale, Rhizoctonia cerealis and R. so/ani).Isolates of the fungi originated from infected wheat plants (Triticum aestivum L.) collected at various locations in the Czech Republic. Three decameric oligonucleotide-primers were selected as producing genotype-specific RAPD products. These markers distinguish all isolates of the above taxons. The intra-species genetic variability of these species also was studied. The values of Dice's coefficients of similarity suggest that isolates of Tapesia yallundae showed a higher degree of intra-species variability than those ofT acufonnis. A high degree of intra-species variability was identified also in Fusarium avenaceum.

Diversité morphologique en culture, sensibilité au carbendazime et pouvoir pathogène du Tapesia yallundae (anamorphe : Pseudocercosporella herpotrichoides)

1995 ◽  
Vol 73 (9) ◽  
pp. 1379-1384 ◽  
Author(s):  
Peter Frei ◽  
Daniel Gindrat
Keyword(s):  
Growth Rate ◽  
Triticum Aestivum ◽  
Hordeum Vulgare ◽  
Rapid Growth ◽  
Slow Growth ◽  
Colony Growth ◽  
Sexual Stage ◽  
Pseudocercosporella Herpotrichoides ◽  
Tapesia Yallundae ◽  
Irregular Margin

Three types of colonies (WH, WA, and RA) have been characterized among 2245 isolates of Pseudocercosporella herpotrichoides on the basis of colony growth rate and appearance (W, rapid growth and regular margin; R, slow growth and irregular margin) and of the shape of the majority of conidia (H, coiled; A, straight). Apothecia of Tapesia yallundae (anamorph : P. herpotrichoides) were produced on naturally infected stems of winter wheat and barley. Apothecia of an undetermined discomycete were occasionally observed. The progeny of more than 1700 ascospores from 72 apothecia of T. yallundae was distributed among the three types of colonies. These types remained stable through successive conidial and mycelial subcultures. All three colony types were sometimes obtained from a single apothecium. WH and WA were the most common, while RH was never observed. WA isolates were more often resistant than WH isolates to carbendazim. Inoculations of wheat and barley stems with ascospores of T. yallundae were unsuccessful, while inoculations with conidia or mycelium resulted in eyespot lesions. During equivalent periods, RA isolates were less virulent than WH and WA. Key words: cereals, eyespot, Deuteromycetes, sexual stage, Hordeum vulgare, Triticum aestivum.

Resistance to soil-borne diseases of wheat: Contributions from the wheatgrasses Thinopyrum intermedium and Th. ponticum

2008 ◽  
Vol 88 (1) ◽  
pp. 195-205 ◽  
Author(s):  
Hongjie Li ◽  
R. L. Conner ◽  
T. D. Murray
Keyword(s):  
Resistance Genes ◽  
Root Rot ◽  
Vascular System ◽  
Bipolaris Sorokiniana ◽  
Wheat Breeding ◽  
Thinopyrum Intermedium ◽  
Common Root ◽  
Chromosome Addition ◽  
Common Root Rot ◽  
Oculimacula Yallundae

Eyespot, Cephalosporium stripe, and common root rot are soil-borne diseases that damage the stem bases, vascular system, subcrown internodes,and roots of wheat. Resistance in wheat to these diseases is insufficient to prevent significant yield loss when disease is severe. The wheatgrasses Thinopyrum intermedium and Th. ponticum are highly resistant to these diseases. Identification of disease-resistant wheat-Thinopyrum partial amphiploids, chromosome addition, substitution, and translocation lines makes them a valuable source of resistance genes for wheat breeding programs. Single chromosomes or chromosome segments containing resistance genes can be transferred into wheat to produce genetic stocks that afford a better understanding of the genetic control of resistance in wheatgrasses and new genetic resources for wheat improvement. Resistance to eyespot in Th. intermedium and Th. ponticum was associated with the homoeologous group 4 chromosomes, whereas resistance to Cephalosporium stripe was controlled by genes located on chromosomes 3 and 6 of Th. ponticum. Despite the fact that some eyespot- and common root rot-resistant wheat-Thinopyrum lines have blue kernels, resistance is not tightly linked to the blue aleurone trait. Key words: Thinopyrum intermedium, Th. ponticum, eyespot, Cephalosporium stripe, common root rot, Oculimacula yallundae, O. acuformis, Cephalosporium gramineum, Bipolaris sorokiniana

scholarly journals Occurrence and Survival of Apothecia of the Eyespot Pathogens Oculimacula acuformis and O. yallundae on Wheat Stubble in the U.S. Pacific Northwest

Plant Disease ◽  
2016 ◽  
Vol 100 (5) ◽  
pp. 991-995 ◽  
Author(s):  
D. I. Vera ◽  
T. D. Murray
Keyword(s):  
Winter Wheat ◽  
Sexual Reproduction ◽  
Pacific Northwest ◽  
Soil Surface ◽  
Genotypic Diversity ◽  
The United States ◽  
The Pacific ◽  
Wheat Stubble ◽  
Oculimacula Yallundae

Eyespot is a chronic disease of wheat caused by Oculimacula yallundae and O. acuformis that results in premature ripening of grain, lodging, and reduced grain yield. Discovery of the sexual stage of these Oculimacula spp. in the Pacific Northwest (PNW) of the United States is relatively recent and the role of apothecia in the epidemiology of eyespot is unclear. Our goals were to determine whether and when apothecia of these Oculimacula spp. are found in the PNW, and monitor their ability to survive over summer and over winter. Seventy-three harvested commercial wheat fields in Idaho, Oregon, and Washington were surveyed for apothecia during spring and fall 2012 and spring 2013. Apothecia of both species were found in both spring and fall in 19% of fields. Apothecia survived on straw placed on the soil surface over the summer but not the winter. This is the first report of O. yallundae apothecia in commercial wheat fields in the PNW. Occurrence of apothecia in spring and fall demonstrates that sexual reproduction of both species occurs regularly in the PNW and at a time when ascospores could serve as primary inoculum for infection of winter wheat. Results of this study are consistent with previous population genetic studies that found high genotypic diversity of both eyespot pathogens in winter wheat fields and provides a baseline for understanding the influence of sexual reproduction on population dynamics and genetics of both pathogens.

scholarly journals Występowanie ważnych gospodarczo chorób pszenicy ozimej w Polsce w latach 2006–2010

2012 ◽  
Vol 67 (2) ◽  
pp. 29-41
Author(s):  
ANNA TRATWAL ◽  
FELICYTA WALCZAK
Keyword(s):  
Blumeria Graminis ◽  
Gaeumannomyces Graminis ◽  
Stagonospora Nodorum ◽  
Puccinia Recondita ◽  
Phaeosphaeria Nodorum ◽  
Oculimacula Yallundae

Źródłem informacji, na podstawie których ocenia się stan fitosanitarny roślin uprawnych w Polsce jest monitorowanie nasilenia występowania agrofagów. Ogólnokrajowy monitoring gospodarczo ważnych agrofagów oparty jest na współpracy Instytutu Ochrony Roślin – Państwowego Instytutu Badawczego (IOR – PIB) w Poznaniu z wojewódzkimi inspektoratami Państwowej Inspekcji Ochrony Roślin i Nasiennictwa. Współpraca polega na prowadzeniu, jednolicie według metodyk opracowanych w IOR – PIB, obserwacji agrofagów, w wyniku których uzyskiwane są dane o nasileniu ich występowania na przestrzeni lat. Informacje te gromadzone są w Zakładzie Metod Prognozowania Agrofagów i Ekonomiki Ochrony Roślin IOR – PIB i na ich podstawie przedstawiany jest obraz zmian dotyczących nasilenia występowania, rejonizacji i rozprzestrzeniania się chorób i szkodników roślin uprawnych. W ostatnich pięciu latach głównymi chorobami pochodzenia grzybowego obserwowanymi w uprawach zbóż były: mączniak prawdziwy zbóż i traw – Blumeria graminis (DC.) Speer., rdza brunatna pszenicy – Puccinia recondita Rob. Ex Desm f. sp. tritici (Eriks.) Johnson, septorioza plew pszenicy – Phaeosphaeria nodorum (E. Müller) Hedjaroude (syn. Stagonospora nodorum (Berg.) Castellani et Germano, łamliwość źdźbła zbóż i traw – Oculimacula yallundae (Wollwork, Spooner) Crous, Gams, oraz zgorzel podstawy źdźbła – Gaeumannomyces graminis (Sacc.) Arx et Olvier.

Sign in / Sign up

Export Citation Format

Share Document