The Rate Constants of Electron Transport in RC PS2 During Disease Development (Stem Rust, Powdery Mildew)

1997 ◽  
pp. 519-521
Author(s):  
Kukushkin Alexander ◽  
F. Ekobena ◽  
P. Henri
Keyword(s):  
Electron Transport ◽  
Powdery Mildew ◽  
Stem Rust ◽  
Rate Constants ◽  
Disease Development

scholarly journals Monitoring of winter rye diseases in Kirov region and possible trends of breeding for immunity

2020 ◽  
Vol 21 (2) ◽  
pp. 124-132
Author(s):  
L. M. Shchekleina
Keyword(s):  
Powdery Mildew ◽  
Fusarium Head Blight ◽  
Stem Rust ◽  
Severe Disease ◽  
Brown Rust ◽  
Winter Rye ◽  
Disease Development ◽  
Head Blight ◽  
Snow Mold ◽  
Seed Crops

The analysis of the phytosanitary situation in production, selection and seed crops of winter rye in Kirov region for the period from 1999 to 2018 was carried out in order to adjust the tasks of breeding for resistance to the most harmful diseases. The affection of the sowings (spread of the disease), the development of the disease and the area of the affected crops relative to the number of the examined ones were evaluated. The trend in the development of the diseases was established on the basis of a regression analysis of long-term data of the branch of the FSBI Rosselkhozcentr in Kirov region. The annual (100 %) manifestation of snow mold and ergot has been established. Next according to the frequency of manifestation there are root rots and brown rust – 95 %, powdery mildew – 75 %, sclerotinia – 70 %, Fusarium head blight – 70 %, and stem rust – 50 %. A relatively low frequency of manifestation has been observed with septoriose and rhynchosporium – 35 and 30 %. However, taking into account the development of winter rye diseases which exceed the economic threshold of harmfulness (ETH), the studied pathocomplexes have different levels of danger. Thus, the development of brown rust above ETH was diagnosed 13 times within 19 years. The most severe disease development (20.0-52.0 %) was in 2001, 2005, 2009, and 2010; weak - in 2007 (0.8 %), 2017 (1.4 %), 2015 (2.4 %), and 2011 (5 %). The manifestation of powdery mildew above ETH was observed 6 times within 15 years, disease development was at the level of 13.0-53.0 %. The development of septoriose above ETH was diagnosed 6 times within 7 years with the development of disease from 13.5 to 63.0 %. Development of stem rust above ETH was diagnosed 5 times within 10 years with the status of the sign of 15.0-20.0 %. The cyclicity of spread of the most harmful diseases and trends of their change in agrocenoses of winter rye are shown. Thus, the most epitphytotically dangerous diseases include snow mold, brown rust, stem rust, powdery mildew and septoriose. Constant control is also required in relation to ergot and Fusarium head blight. These diseases should be an object for breeding-and-immunological studies.

RESISTANCE TO MILDEW OF SELECTION FAMILY OF RED CURRANT THE BELAYA POTAPENKO × № 1426-21-80

1970 ◽  
pp. 38-40
Author(s):  
O. O. Kalinina ◽  
O. D. Golyaeva ◽  
O. V. Panfilova ◽  
А. V. Pikunova
Keyword(s):  
Powdery Mildew ◽  
Field Resistance ◽  
Disease Development ◽  
Artificial Infection ◽  
Sources Of Resistance ◽  
Climate Conditions ◽  
High Productivity ◽  
Local Soil ◽  
The Family ◽  
Red Currant

Powdery mildew is one of the most harmful fungal diseases that causes economically significant damage to berry plantations. The disease is common in all areas of currant cultivation in the Russian Federation. In this regard, in modern conditions of intensive berry growing, the problem of breeding cultivars that are highly resistant to diseases and pests becomes urgent. Breeders have a difficult task to combine the adaptive potential of the cultivar with its annual high productivity and resistance to biotic environmental factors. When studying the adaptability of introduced cultivars of red currant and selected forms of the Institute to local soil and climate conditions, the following cultivars were identified as sources of economic and useful characteristics and involved in selection: ‘Belaya Potapenko’ as a complex source of resistance powdery mildew and high marketable and taste qualities of berries; SS 1426-21-80 as a source of high productivity and long racemes (raceme length 11-13 cm; up to 20 berries in the raceme). On their base the selection family of red currant has been developed: Belaya Potapenko × ♂SS 1426-21-80. The study of data on the destruction of hybrid seedlings of the selection family by powdery mildew showed that in epiphytotic conditions, the percentage of intensity of the disease development varies over the periods of screening from 0.2% in May to 20.4% in June. Such indicators served as a prerequisite for conducting a comparative test of breeding material in the field under artificial infection with powdery mildew. After artificial infection on the background of epiphytosis, the rate of intensity of the disease development increased slightly and amounted to 35.6% for the family. There were 30 highly resistant seedlings in the family, 10 of which have remained stable and highly resistant since 2018. In these plants we can assume the presence of the so-called field resistance, controlled by polygens, each of which does not give a visible effect of stability, but with different combinations determines one or another of its degree. Highly resistant seedlings will be used in further breeding studies to identify new sources of resistance to powdery mildew.

Registration of KS91WGRC14 Stem Rust and Powdery Mildew Resistant T1BL 1RS Durum Wheat Germplasm

Crop Science ◽  
1993 ◽  
Vol 33 (1) ◽  
pp. 220-220 ◽  
Author(s):  
B. Friebe ◽  
B. S. Gill ◽  
T. S. Cox ◽  
F. J. Zeller
Keyword(s):  
Powdery Mildew ◽  
Durum Wheat ◽  
Stem Rust ◽  
Wheat Germplasm

Resistance of Tangmai 4 wheat to powdery mildew, stem rust, leaf rust, and stripe rust and its chromosome composition

2004 ◽  
Vol 84 (4) ◽  
pp. 1015-1023 ◽  
Author(s):  
H. J. Li ◽  
R. L. Conner ◽  
B. D. McCallum ◽  
X. M. Chen ◽  
H. Su ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Leaf Rust ◽  
Stripe Rust ◽  
Stem Rust ◽  
Northern China ◽  
Western Canada ◽  
C Banding ◽  
Rust Diseases ◽  
Hard Red Winter Wheat ◽  
Secale Cereale L

The hard red winter wheat Tangmai 4 did not develop symptoms of infection following inoculation with powdery mildew (Erysiphe graminis DC. f. sp. tritici E. Marchal) isolates from regions of western Canada and northern China. Tangmai 4 exhibited resistance to stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & Henn.) and leaf rust (P. triticina Eriks.) races from western Canada. This wheat line was resistant to individual stripe rust (P. striiformis Westend. f. sp. tritici Eriks.) races from the U.S. and Canada. Sequential C-banding and genomic in situ hybridization (GISH), and electrophoretic analyses of high molecular weight glutenins and gliadins demonstrated that Tangmai 4 carried a pair of T1BL·1RS wheat-rye (Secale cereale L.) translocated chromosomes. Since the genes located on T1BL·1RS are no longer effective in controlling powdery mildew and the rust diseases, Tangmai 4 must carry additional genes for resistance to these diseases, which makes it a valuable resource for the improvement of resistance in wheat against these diseases. Key words: T1BL·1RS translocation, disease resistance, sequential C-banding and GISH, glutenin, gliadin

scholarly journals Phenotypes Conferred by Wheat Multiple Pathogen Resistance Locus, Sr2, Include Cell Death in Response to Biotic and Abiotic Stresses

2019 ◽  
Vol 109 (10) ◽  
pp. 1751-1759
Author(s):  
Linda Tabe ◽  
Sharon Samuel ◽  
Matthew Dunn ◽  
Rosemary White ◽  
Rohit Mago ◽  
...  
Keyword(s):  
Cell Death ◽  
Powdery Mildew ◽  
Stem Rust ◽  
Abiotic Stresses ◽  
Resistance Locus ◽  
Petroleum Jelly ◽  
Wheat Stem Rust ◽  
Mesophyll Cells ◽  
Rust Infection ◽  
Photosynthetic Cells

The wheat Sr2 locus confers partial resistance to four biotrophic pathogens: wheat stem rust (Puccinia graminis f. sp. tritici), leaf rust (P. triticina), stripe rust (P. striiformis f. sp. tritici), and powdery mildew (Blumeria graminis f. sp. tritici). In addition, Sr2 is linked with a brown coloration of ears and stems, termed pseudo-black chaff (PBC). PBC, initially believed to be elicited by stem rust infection, was subsequently recognized to occur in the absence of pathogen infection. The current study demonstrates that the resistance response to stem rust is associated with the death of photosynthetic cells around rust infection sites in the inoculated leaf sheath. Similarly, Sr2-dependent resistance to powdery mildew was associated with the death of leaf mesophyll cells around mildew infection sites. We demonstrate that PBC occurring in the absence of pathogen inoculation also corresponds with death and the collapse of photosynthetic cells in the affected parts of stems and ears. In addition, Sr2-dependent necrosis was inducible in leaves by application of petroleum jelly or by heat treatments. Thus, Sr2 was found to be associated with cell death, which could be triggered by either biotic or abiotic stresses. Our results suggest a role for the Sr2 locus in controlling cell death in response to stress.

scholarly journals Effects of Sunlight Exposure on Grapevine Powdery Mildew Development

2012 ◽  
Vol 102 (9) ◽  
pp. 857-866 ◽  
Author(s):  
Craig N. Austin ◽  
Wayne F. Wilcox
Keyword(s):  
Powdery Mildew ◽  
Solar Radiation ◽  
Controlled Environment ◽  
Disease Development ◽  
Inhibitory Effects ◽  
Grapevine Powdery Mildew ◽  
Individual Experiment ◽  
Hyphal Formation ◽  
The Individual ◽  
Artificial Shading

Natural and artificially induced shade increased grapevine powdery mildew (Erysiphe necator) severity in the vineyard, with foliar disease severity 49 to 75% higher relative to leaves in full sun, depending on the level of natural shading experienced and the individual experiment. Cluster disease severities increased by 20 to 40% relative to those on check vines when ultraviolet (UV) radiation was filtered from sunlight reaching vines in artificial shading experiments. Surface temperatures of leaves in full sunlight averaged 5 to 8°C higher than those in natural shade, and in one experiment, filtering 80% of all wavelengths of solar radiation, including longer wavelengths responsible for heating irradiated tissues, increased disease more than filtering UV alone. In controlled environment experiments, UV-B radiation reduced germination of E. necator conidia and inhibited both colony establishment (hyphal formation and elongation) and maturity (latent period). Inhibitory effects of UV-B radiation were significantly greater at 30°C than at 20 or 25°C. Thus, sunlight appears to inhibit powdery mildew development through at least two mechanisms, i.e., (i) UV radiation's damaging effects on exposed conidia and thalli of the pathogen; and (ii) elevating temperatures of irradiated tissues to a level supraoptimal or inhibitory for pathogen development. Furthermore, these effects are synergistic at temperatures near the upper threshold for disease development.

Disease resistance in the genusAegilops L. — stem rust, leaf rust, stripe rust, and powdery mildew

1985 ◽  
Vol 33 (2) ◽  
pp. 133-153 ◽  
Author(s):  
Jan Valkoun ◽  
Karl Hammer ◽  
Dagmar Kučerová ◽  
Pavel Bartoš
Keyword(s):  
Disease Resistance ◽  
Powdery Mildew ◽  
Leaf Rust ◽  
Stripe Rust ◽  
Stem Rust

A multiple resistance locus on chromosome arm 3BS in wheat confers resistance to stem rust (Sr2), leaf rust (Lr27) and powdery mildew

2011 ◽  
Vol 123 (4) ◽  
pp. 615-623 ◽  
Author(s):  
R. Mago ◽  
L. Tabe ◽  
R. A. McIntosh ◽  
Z. Pretorius ◽  
R. Kota ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Leaf Rust ◽  
Stem Rust ◽  
Multiple Resistance ◽  
Resistance Locus ◽  
Chromosome Arm

scholarly journals Prevalence and Intensity of Barley Diseases in South Tigray, Ethiopia

2017 ◽  
Vol 6 (3) ◽  
pp. 41-45
Author(s):  
Teklay A. Teferi ◽  
Muruts L. Wubshet
Keyword(s):  
Powdery Mildew ◽  
Leaf Rust ◽  
Stem Rust ◽  
Integrated Management ◽  
Management Options ◽  
Leaf Scald ◽  
The Mean ◽  
All Diseases

Barley is attacked by many diseases and hence, the study was conducted to quantify and profile barley affecting diseases for management options. The survey was based on the assessment of barley fields at 5 km interval. Results indicated that powdery mildew, leaf rust, stem rust, leaf scald, and smuts were among the important diseases in south Tigray. The prevalence of the former diseases was 60, 60, 40, 47.8, and 40%, respectively. The incidence of powdery mildew, scaled, leaf rust and stem rust was 100% in considerable fields and cultivars. The incidence of smuts was ranged from 5% to 30%. Similarly, the mean severities of powdery mildew, leaf rust, stem rust and leaf scald were 43.4, 54.5, 45 and 20%, respectively, while, smuts caused complete spike losses.  Therefore, investigating of the pathogens variability especially for rusts, powdery mildew and scald as well as developing integrated management options for all diseases is of concern.

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