Reaction of Selected Maize Genotypes to Field Races of Exserohilum Turcicum in Uganda

: A study was conducted during Kharif 2012 and 2013 at Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar Campus Srinagar with the objective of screening sixty maize genotypes against Turcicum leaf blight caused by Exserohilum turcicum (Pass.) Leonard and Suggs. Field experiment was laid out in a randomized block design with three replications. In order to ensure establishment of infection, artificial inoculation of E. turcicum on test genotypes was made twice at 30 and 40 days after sowing with two different methods of inoculation (spraying on foliage of maize with spore suspension of pathogen @ 5x104 spores/ml at 30 DAS and by whorl drop inoculation of pathogen multiplies on sorghum grains at 40 DAS). Disease severity on test entries was scored at silk drying stage and studies revealed that two inbred lines, viz., NAI-112 and NAI-147, and one hybrid, viz., HQPM-1 were found resistant with pooled disease intensity of 4.12 per cent, 4.04 per cent and 4.38 per cent, respectively. Four inbred lines, viz., KDM 381 A, KDM 918 A, NAI-152 and NAI-167 were found susceptible with pooled disease intensity of 52.82 per cent, 51.02 per cent, 58.58 per cent and 61.33 per cent, respectively. The remaining genotypes were moderately resistant to moderately susceptible.

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Evaluation of maize genotypes for Turcicum leaf blight (Exserohilum turcicum) in Terai and inner terai of Nepal

Journal of Maize Research and Development ◽

10.3126/jmrd.v2i1.16221 ◽

2016 ◽

Vol 2 (1) ◽

pp. 109-116

Author(s):

Tirtha Raj Rijal ◽

Govind KC ◽

Kesab Babu Koirala ◽

Jiban Shrestha

Keyword(s):

Disease Severity ◽

Pooled Analysis ◽

Leaf Blight ◽

Exserohilum Turcicum ◽

Sources Of Resistance ◽

Maize Productivity ◽

Maize Genotypes ◽

Disease Severity Scale ◽

High Yielding Varieties ◽

Moderately Resistant

Thirty maize genotypes in 2014-2015 at Dumarwana, Nijgadh, Keureni and Rampur and ten genotypes in 2015-2016 at Anandpur, Shitalnagar, Dumarwana, Nijgadh and Rampur were evaluated for resistance to Turcicum leaf blight (Exserohilum turcicum) under farmers field conditions. The scale used for disease severity ranged from 1-5 scale based on the proportionate leaf area affected by the disease. The combined analysis over locations in 2014-2015 showed that among the 30 genotypes 25 genotypes were resistant (1.0-2.0 scale), and 5 genotypes were moderately resistant (2.1-3.0 scale). Similarly the pooled analysis over locations in 2015-2016 showed that 7 genotypes were resistant (1.0-2.0 scale) and 3 genotypes were moderately resistant (2.1-3.0 scale). The maize genotypes namely Z376-26, Z478-3, Z433-99, Z464-5, Z478-2, Z466-1, CAH1513, RML-95/RML-96, CAH1515, CAH1521, CAH1515, CAH151, CAH153, ZH114228 , Z376-9, Z466-3, Z376-5, RML-32/RML-17, RML-86/RML-96 and 900MGold were resistant with disease severity scale of 1.5 and with higher grain yield in both the years. Thus above genotypes were identified as promising sources of resistance against E. turcicum and they can be used to develop disease resistant and high yielding varieties to enhance maize productivity in terai and inner terai of Nepal.

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Tolerance Expression of Maize Genotypes to Exserohilum turcicum in North and South Korea

Korean Journal of Crop Science ◽

10.7740/kjcs.2012.57.2.113 ◽

2012 ◽

Vol 57 (2) ◽

pp. 113-126 ◽

Cited By ~ 1

Author(s):

Soon-Kwon Kim ◽

Hyoung-Wook Kim ◽

Joon-Soo Lee ◽

Chang-Suk Huh ◽

Sun-Hwack Kim ◽

...

Keyword(s):

South Korea ◽

Exserohilum Turcicum ◽

Maize Genotypes ◽

North And South

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Pathogenic variability in Exserohilum turcicum and identification of resistant sources to turcicum leaf blight of maize (Zea mays L.)

Journal of Applied and Natural Science ◽

10.31018/jans.v8i3.994 ◽

2016 ◽

Vol 8 (3) ◽

pp. 1523-1529

Author(s):

M. Ashraf Ahangar ◽

Z. A. Bhat ◽

F. A. Sheikh ◽

Z. A. Dar ◽

Ajaz A. Lone ◽

...

Keyword(s):

Leaf Blight ◽

Limiting Factor ◽

Exserohilum Turcicum ◽

Maize Production ◽

Maize Genotypes ◽

Pathogenic Variation ◽

Early Maturing ◽

Differential Hosts ◽

Pathogenic Variability ◽

Moderately Resistant

Turcicum leaf blight of maize incited by Exserohilum turcicum (Pass.) Leonard and Suggs is the major limiting factor of maize production in temperate agro-ecologies. Disease management through host plant resistance is the most effective strategy. In the present study among 26 maize genotypes which were initially screened for resistance against E. turcicum under field conditions, 8 genotypes viz., PS 39, CML 451, CML 470, CML 472, VL 1030, VL 1018140, VL1018527 and SMI178-1 were found resistant when screened against twelve isolates of E. turcicum under artificial epiphytotic conditions. Eight genotypes viz., PS45, CML165, CML459, VL1249, VL0536, SMC-5, SMC-3 and KDL 211 were found moderately resistant with disease grade ranged from 2.1-2.5. These maize genotypes possess resistance to turcicum leaf blight can be used successfully in developing high yielding early maturing varieties for high altitude temperate agro-ecologies. The fungus E. turcicum is highly variable in nature. Variability studies on pathogenicity were conducted on twelve isolates of E. turcicum on eleven putative differential maize lines. During the present study a wide pathogenic variation was observed among the twelve isolates of E. turcicum. Cluster analysis on the basis of similarity or dissimilarity in reaction types exhibited by the differential hosts, clustered the isolates into 6 pathogenic groups. The isolates belonged to higher altitudes (Kti 10, Kti11, Kti5) were found to be more aggressive as compared to the isolates of low altitude areas.

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Reaction of 13 Maize Genotypes to Exserohilum Turcicum in Different Agro-Ecological Zones of Uganda

East African Agricultural and Forestry Journal ◽

10.1080/00128325.1994.11663197 ◽

1994 ◽

Vol 59 (3) ◽

pp. 213-218 ◽

Cited By ~ 2

Author(s):

E. Adipala

Keyword(s):

Exserohilum Turcicum ◽

Ecological Zones ◽

Maize Genotypes ◽

Agro Ecological Zones

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Biochemical Markers for Disease Resistance in Corn

10.32747/1996.7613037.bard ◽

1996 ◽

Author(s):

Ralph Nicholson ◽

Reuven Reuveni ◽

Moshe Shimoni

Keyword(s):

Biochemical Markers ◽

Fungal Pathogens ◽

Exserohilum Turcicum ◽

Biochemical Traits ◽

Breeding Lines ◽

Puccinia Sorghi ◽

Johnson Grass ◽

Maize Genotypes ◽

Gene Data ◽

Anthocyanin Production

The objective was to screen maize lines for their ability to express resistance based on biochemical traits. Cultivars were screened for retention of the hydroxamic acid DIMBOA and the synthesis of phenols (based on anthocyanin production) as markers for resistance. Lines were selected and inoculated with fungal pathogens (Exserohilum turcicum, Puccinia sorghi, Cochliobolus heterostraphus, Colletotricum graminicola.), and the Maize Dwarf Mosaic and Johnson Grass Mosaic viruses. Lines were screened in the field and greenhouse. Results showed that lines selected for augmented phenol synthesis do exhibit heightened levels of resistance to fungal pathogens. Isolation of mRNA followed by northern analyses for expression of A1 (dihydroflavanol reductase) and peroxidase confirmed that genes for these enzymes were turned on in response to inoculation of lines predicted to exhibit resistance. Peroxidase and b-1,3-glucanase were assayed in breeding lines having or lacking the se gene. A specific ionically-bound peroxidase isozyme and a b-1,3-glucanase isozyme were revealed in lines having the se gene. Data suggest that peroxidase and b-1,3-glucanase isozymes, may be considered as markers to identify resistance to E. turcicum in maize genotypes with the se gene.

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