Production of Pseudothecia and Conidia by Pyrenophora Tritici-Repentis in Relation to Nutrients and Substrate.

1991 ◽  
Vol 20 (3) ◽  
pp. 92 ◽  
Author(s):  
TDW James ◽  
BA Summerell ◽  
LW Burgess
Keyword(s):  
Pyrenophora Tritici Repentis

Molecular manipulation of the mating-type system and development of a new approach for characterizing pathogen virulence in Pyrenophora tritici-repentis

2017 ◽  
Vol 109 ◽  
pp. 16-25 ◽  
Author(s):  
Gazala Ameen ◽  
Gayan Kariyawasam ◽  
Gongjun Shi ◽  
Timothy L. Friesen ◽  
Justin D. Faris ◽  
...  
Keyword(s):  
Mating Type ◽  
Type System ◽  
New Approach ◽  
Pathogen Virulence ◽  
Pyrenophora Tritici Repentis ◽  
Molecular Manipulation

Pyrenophora tritici-repentis. [Distribution map].

1992 ◽  
Author(s):  
Keyword(s):  
South Africa ◽  
Puerto Rico ◽  
Central America ◽  
West Indies ◽  
New South ◽  
Distribution Map ◽  
Pyrenophora Tritici Repentis ◽  
South Wales ◽  
Triticum Spp ◽  
New Distribution

Abstract A new distribution map is provided for Pyrenophora tritici-repentis (Died.) Drechsler. Hosts: wheat (Triticum spp.) and other grasses. Information is given on the geographical distribution in AFRICA, Ethiopia, Kenya, Morocco, South Africa, Tanzania, Tunisia, Uganda, ASIA, Afghanistan, Bhutan, China, Zhejiang, India, Bihar, Iran, Israel, Japan, Nepal, Thailand, Turkey, USSR ,: N. Caucasus, AUSTRALASIA & OCEANIA, Australia ,: New South Wales, EUROPE, Austria, Belgium, Cyprus, Czechoslovakia, Denmark, Finland, France, Germany, Hungary, Italy, Latvia, Poland, Romania, Spain, Sweden, Switzerland, UK, England, USSR, Byelorussia, NORTH AMERICA, Canada, Mexico, USA, CENTRAL AMERICA & WEST INDIES, Puerto Rico, SOUTH AMERICA, Bolivia, Brazil, Chile, Colombia, Ecuador, Peru.

Pyrenophora tritici-repentis. [Descriptions of Fungi and Bacteria].

1976 ◽  
Author(s):  
M. B. Ellis
Keyword(s):  
Geographical Distribution ◽  
Cynodon Dactylon ◽  
Premature Death ◽  
Pyrenophora Tritici Repentis ◽  
Elymus Repens ◽  
Weed Hosts ◽  
Wheat Leaves ◽  
Grass Weed ◽  
Severe Leaf ◽  
Agropyron Repens

Abstract A description is provided for Pyrenophora tritici-repentis. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Wheat, rye, barley, Agropyrons repens, Cynodon dactylon, Elymus glaucus. DISEASES: Causes yellow leaf spot of cereals and grasses; oval to lanceolate. yellow to grey brown lesions often with a yellow halo. The lesions can be distinguished from those caused by Cochliobolus sativus because of their lighter colour. The disease results in premature death of leaves. It can also cause a seedling blight and root rot. Common and widespread on Agropyron repens[Elymus repens] and wheat, occasionally on barley and rye and recorded on many other grasses. Sometimes causes severe leaf wilt and spotting especially on durum wheat. Leaves of Agropyron repens[Elymus repens] when attacked gradually lose their colour and wither from the tips backwards; they become at first pale yellow, later grey. On wheat fusiform, oval or lanceolate spots, 0.5-2 cm long, 2-4 mm wide are formed. These are at first yellow but later turn brown or greyish brown often with a yellow halo. The leaves die prematurely from the tip backwards. GEOGRAPHICAL DISTRIBUTION: Australia; Asia (Japan, India, Nepal); Africa (Uganda, Kenya, Tanzania, Ethiopia); Europe (Britain, Germany, Czechoslovakia, Sweden, Cyprus); S. America (Bolivia); and N. America (Canada, USA). TRANSMISSION: Air-borne spores (51, 1045p), seed-borne by both external contamination and internal infection (34, 24), secondary grass weed hosts (11, 695), carryover on stubble and other crop debris (43, 1225f; 52, 685).

Development and Application of a New PCR Method for Detection of Blumeria graminis f. sp. tritici

2018 ◽  
Vol 28 (3) ◽  
pp. 137-146 ◽  
Author(s):  
Adam Kuzdraliński ◽  
Hubert Szczerba ◽  
Anna Kot ◽  
Agnieszka Ostrowska ◽  
Michał Nowak ◽  
...  
Keyword(s):  
Dna Sequences ◽  
Puccinia Triticina ◽  
Blumeria Graminis ◽  
Pyrenophora Tritici Repentis ◽  
Field Samples ◽  
Expected Length ◽  
Pcr Assays ◽  
Primer Sets ◽  
Wheat Leaves ◽  
Species Specific

We developed new PCR assays that target beta-tubulin (<i>TUB2</i>) and 14 alpha-demethylase (<i>CYP51</i>) genes and used them for the species-specific detection of <i>Blumeria graminis</i> f. sp. <i>tritici</i> (<i>Bgt</i>). Based on fungi DNA sequences available in the NCBI (National Center for Biotechnology Information) GenBank database we developed simplex and duplex PCR assays. The specificities of the primer sets were evaluated using environmental samples of wheat leaves collected during the 2015/2016 growing season across Poland. Primer sets<i></i> LidBg17/18 and LidBg21/22 strongly amplified fragments of the expected length for all 67 tested samples. Primer specificity was confirmed using field samples of <i>Zymoseptoria tri­tici</i>, <i>Puccinia triticina</i> (syn.<i> P. recondita</i> f. sp.<i> tritici</i>), <i>P. striiformis</i> f. sp.<i> tritici</i>, and <i>Pyrenophora tritici-repentis</i>.

scholarly journals Genomic distribution of a novel Pyrenophora tritici-repentis ToxA insertion element

PLoS ONE ◽  
2018 ◽  
Vol 13 (10) ◽  
pp. e0206586 ◽  
Author(s):  
Paula M. Moolhuijzen ◽  
Pao Theen See ◽  
Richard P. Oliver ◽  
Caroline S. Moffat
Keyword(s):  
Insertion Element ◽  
Genomic Distribution ◽  
Pyrenophora Tritici Repentis

Red smudge infection modifies sprouting response in four wheat lines

2003 ◽  
Vol 83 (1) ◽  
pp. 163-169 ◽  
Author(s):  
S. L. Fox ◽  
M. R. Fernandez ◽  
R. M. DePauw
Keyword(s):  
Crude Extract ◽  
Triticum Aestivum L ◽  
Preharvest Sprouting ◽  
Conidial Suspension ◽  
Percentage Germination ◽  
Germination Time ◽  
Pyrenophora Tritici Repentis ◽  
Mean Germination Time ◽  
Sprouting Resistance ◽  
Lower Temperature

Infection of wheat (Triticum aestivum L.) spikes by Pyrenophora tritici-repentis (Died.) Drechs. (Ptr) causes kernel discolouration, reducing the commercial value of the grain. Preharvest sprouting in wheat causes loss of grain yield, grain functionality and value as seed. The objective of this research was to determine the effects of Ptr infection on the expression of preharvest sprouting response. Four genotypes representing a range of preharvest sprouting response were studied: RL4137 has very good sprouting resistance; SC8021V2, good; AC Karma, fair; and Genesis, poor. These genotypes were grown in a growth cabinet and their spikes were artificially inoculated with a conidial suspension of Ptr or water. Spikes were collected at physiologic maturity, threshed by hand and germinated on wetted filter paper at 10 or 20°C to obtain a percentage germination and a mean germination time. Healthy seeds were also germinated in a solution containing a crude extract of the fungus. At 20°C, sprouting-resistant genotypes showed a significant delay in germination compared to susceptible genotypes; however, differences were not significant at the lower temperature. Genesis germinated quickly at both temperatures. All genotypes except Genesis had reductions in sprouting resistance when infected by Ptr, but these effects were significant only at 20°C. When inoculated with Ptr and germinated at 20°C, AC Karma germinated as quickly as the water controls and gave a preharvest sprouting response similar to Genesis. However, SC8021V2 and RL4137 inoculated with Ptr retained 40 and 78%, respectively, of their mean germination time compared to the water controls. Germination of healthy seeds in a solution containing a crude extract of Ptr increased the percentage germination and shortened the mean germination time of all genotypes, but did not result in significant changes for any individual line. Key words: Triticum, Pyrenophora tritici-repentis, preharvest sprouting, smudge

scholarly journals Identification and Molecular Mapping of a Gene Conferring Resistance to Pyrenophora tritici-repentis Race 3 in Tetraploid Wheat

2006 ◽  
Vol 96 (8) ◽  
pp. 885-889 ◽  
Author(s):  
P. K. Singh ◽  
J. L. Gonzalez-Hernandez ◽  
M. Mergoum ◽  
S. Ali ◽  
T. B. Adhikari ◽  
...  
Keyword(s):  
Resistance Genes ◽  
Molecular Mapping ◽  
Recombinant Inbred Lines ◽  
Tetraploid Wheat ◽  
Recessive Gene ◽  
Tan Spot ◽  
Substitution Lines ◽  
Disease Reaction ◽  
Pyrenophora Tritici Repentis ◽  
The Cross

Race 3 of the fungus Pyrenophora tritici-repentis, causal agent of tan spot, induces differential symptoms in tetraploid and hexaploid wheat, causing necrosis and chlorosis, respectively. This study was conducted to examine the genetic control of resistance to necrosis induced by P. tritici-repentis race 3 and to map resistance genes identified in tetraploid wheat (Triticum turgidum). A mapping population of recombinant inbred lines (RILs) was developed from a cross between the resistant genotype T. tur-gidum no. 283 (PI 352519) and the susceptible durum cv. Coulter. Based on the reactions of the Langdon-T. dicoccoides (LDN[DIC]) disomic substitution lines, chromosomal location of the resistance genes was determined and further molecular mapping of the resistance genes for race 3 was conducted in 80 RILs of the cross T. turgidum no. 283/Coulter. Plants were inoculated at the two-leaf stage and disease reaction was assessed 8 days after inoculation based on lesion type. Disease reaction of the LDN(DIC) lines and molecular mapping on the T. turgidum no. 283/Coulter population indicated that the gene, designated tsn2, conditioning resistance to race 3 is located on the long arm of chromosome 3B. Genetic analysis of the F2 generation and of the F4:5 and F6:7 families indicated that a single recessive gene controlled resistance to necrosis induced by race 3 in the cross studied.

scholarly journals The emergence of cereal fungal diseases and the incidence of leaf spot diseases in Finland

2008 ◽  
Vol 20 (1) ◽  
pp. 62 ◽  
Author(s):  
M. JALLI ◽  
P. LAITINEN ◽  
S. LATVALA
Keyword(s):  
Spring Wheat ◽  
Leaf Spot ◽  
Fungal Pathogens ◽  
Plant Pathogens ◽  
Field Survey ◽  
Fungal Diseases ◽  
Cochliobolus Sativus ◽  
Pyrenophora Tritici Repentis ◽  
Fungal Plant Pathogens ◽  
First Time

Fungal plant pathogens causing cereal diseases in Finland have been studied by a literature survey, and a field survey of cereal leaf spot diseases conducted in 2009. Fifty-seven cereal fungal diseases have been identified in Finland. The first available references on different cereal fungal pathogens were published in 1868 and the most recent reports are on the emergence of Ramularia collo-cygni and Fusarium langsethiae in 2001. The incidence of cereal leaf spot diseases has increased during the last 40 years. Based on the field survey done in 2009 in Finland, Pyrenophora teres was present in 86%, Cochliobolus sativus in 90% and Rhynchosporium secalis in 52% of the investigated barley fields. Mycosphaerella graminicola was identified for the first time in Finnish spring wheat fields, being present in 6% of the studied fields. Stagonospora nodorum was present in 98% and Pyrenophora tritici-repentis in 94% of spring wheat fields. Oat fields had the fewest fungal diseases. Pyrenophora chaetomioides was present in 63% and Cochliobolus sativus in 25% of the oat fields studied.;

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