Identity of Pyrenophora isolates causing net-type and spot-type lesions on barley

1991 ◽  
Vol 116 (1) ◽  
pp. 29-35 ◽  
Author(s):  
D. B. Scott
Keyword(s):  
Spot Type

scholarly journals Simulations of Switchback, Fragmentation and Sunspot Pair in δ-Sunspots during Magnetic Flux Emergence

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 586
Author(s):  
Che-Jui Chang ◽  
Jean-Fu Kiang
Keyword(s):  
Magnetic Field ◽  
Solar System ◽  
Field Strength ◽  
Magnetic Flux ◽  
Initial Conditions ◽  
Observation Data ◽  
Flux Emergence ◽  
Polarity Inversion ◽  
Simulation Results ◽  
Spot Type

Strong flares and coronal mass ejections (CMEs), launched from δ-sunspots, are the most catastrophic energy-releasing events in the solar system. The formations of δ-sunspots and relevant polarity inversion lines (PILs) are crucial for the understanding of flare eruptions and CMEs. In this work, the kink-stable, spot-spot-type δ-sunspots induced by flux emergence are simulated, under different subphotospheric initial conditions of magnetic field strength, radius, twist, and depth. The time evolution of various plasma variables of the δ-sunspots are simulated and compared with the observation data, including magnetic bipolar structures, relevant PILs, and temperature. The simulation results show that magnetic polarities display switchbacks at a certain stage and then split into numerous fragments. The simulated fragmentation phenomenon in some δ-sunspots may provide leads for future observations in the field.

Detection of Spot-Type Defects on Liquid Crystal Display Modules

2004 ◽  
Vol 270-273 ◽  
pp. 808-813 ◽  
Author(s):  
Woo Seob Kim ◽  
Dong Min Kwak ◽  
Young Chul Song ◽  
Doo Hyun Choi ◽  
Kil Houm Park
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Spot Type

Particulate Entry Lag In Spot-type Smoke Detectors

2000 ◽  
Vol 6 ◽  
pp. 779-790 ◽  
Author(s):  
T. Cleary ◽  
A. Chernovsky ◽  
W. Grosshandler ◽  
M. Anderson
Keyword(s):  
Smoke Detectors ◽  
Spot Type

scholarly journals Cooling efficiency of a spot-type personalized air-conditioner

2017 ◽  
Vol 121 ◽  
pp. 35-48 ◽  
Author(s):  
Shengwei Zhu ◽  
Daniel Dalgo ◽  
Jelena Srebric ◽  
Shinsuke Kato
Keyword(s):  
Cooling Efficiency ◽  
Air Conditioner ◽  
Spot Type

scholarly journals Current Virulence of Pyrenophora teres on Barley in Western Australia

Plant Disease ◽  
2001 ◽  
Vol 85 (9) ◽  
pp. 960-966 ◽  
Author(s):  
Sanjiv Gupta ◽  
Robert Loughman
Keyword(s):  
Western Australia ◽  
Error Variance ◽  
Geographic Area ◽  
Australian Isolate ◽  
Pyrenophora Teres ◽  
Sources Of Resistance ◽  
Pathogenic Variation ◽  
Resistant Varieties ◽  
Significant Line ◽  
Spot Type

Studies on variation, occurrence, and distribution of virulence in Pyrenophora teres are helpful to identify effective sources of resistance that can be used for barley breeding in Western Australia. Seventy-nine isolates of Pyrenophora teres were collected from different barley fields of Western Australia in 1995-96. Seventy-four induced net type symptoms (P. teres f. teres) and five induced spot type symptoms (P. teres f. maculata). Net type isolate responses on 47 barley lines were similar to the range of responses induced by nine historical isolates collected in the region between 1975 and 1985. These net type isolates were classified into two distinct groups based on virulence to the cultivar Beecher. Isolates were further classified into eight groups based on minor pathogenic variation among the population. The virulence phenotype present in an eastern Australian isolate was not observed in any isolates collected from Western Australia. An analysis of variance on a subset of 12 net type isolates indicated a significant line × isolate interaction (P < 0.001), with the interaction term variance component four times larger than the error variance. Based on these studies, the virulence among net type isolates has remained stable in Western Australia for the last 19 years. Spot type isolates were collected from a wider geographic area than previously reported and varied in virulence based on response to barley line Herta. Variation in spot-type isolates is reported for the first time from the region. The results from this study are being used in the development of resistant varieties.

NEW TYPES OF VIRULENCE IN PYRENOPHORA TERES IN CANADA

1974 ◽  
Vol 54 (4) ◽  
pp. 731-734 ◽  
Author(s):  
A. TEKAUZ ◽  
J. T. MILLS
Keyword(s):  
Hordeum Vulgare ◽  
Spot Blotch ◽  
Cochliobolus Sativus ◽  
Pyrenophora Teres ◽  
Hordeum Vulgare L ◽  
Moderately Resistant ◽  
Hybrid Lines ◽  
Spot Type

Isolates of Pyrenophora teres (Died.) Drechsl. causing either net- or spot-type symptoms on barley (Hordeum vulgare L.) were collected in 1973 from fields near Winnipeg, Manitoba. Spot-type symptoms were similar to those of spot blotch incited by Cochliobolus sativus (Ito and Kurib.) Drechsl. ex Dastur. The cultivars Herta and Fergus, previously reported to be moderately resistant, were susceptible to both types of isolates. These two cultivars presently account for virtually all of the two-rowed barley and about half of the total barley acreage in Manitoba. The resistant hybrid lines CI 5791 and BT 201 retained their resistance to the isolates which produced net-type symptoms but were less resistant to those producing the spot type.

Sign in / Sign up

Export Citation Format

Share Document