Inheritance of Resistance to Anthracnose Leaf Blight in Five Inbred Lines of Corn

1981 ◽  
Vol 71 (5) ◽  
pp. 488 ◽  
Author(s):  
M. L. Carson
Keyword(s):  
Inbred Lines ◽  
Leaf Blight ◽  
Inheritance Of Resistance ◽  
Anthracnose Leaf Blight

scholarly journals Genetic resistance of maize inbred lines to anthracnose leaf blight

2016 ◽  
Vol 16 (1) ◽  
pp. 55-61 ◽  
Author(s):  
Hellen Christine Prochno ◽  
Caroline de Jesus Coelho ◽  
Cristiane Romanek ◽  
Danilo Fernando Guimarães Silva ◽  
Daniele Tasior ◽  
...  
Keyword(s):  
Genetic Resistance ◽  
Inbred Lines ◽  
Leaf Blight ◽  
Maize Inbred Lines ◽  
Anthracnose Leaf Blight

scholarly journals Inheritance of Resistance to Gray Leaf Spot in Crosses Involving Selected Resistant Inbred Lines of Corn

1998 ◽  
Vol 88 (9) ◽  
pp. 972-982 ◽  
Author(s):  
S. T. Coates ◽  
D. G. White
Keyword(s):  
Leaf Area ◽  
Leaf Spot ◽  
Inbred Lines ◽  
Gray Leaf Spot ◽  
Inheritance Of Resistance ◽  
Generation Mean Analysis ◽  
Susceptible Parent ◽  
Dominance Model ◽  
Resistant Parent ◽  
Naturally Occurring

Three populations derived from crosses of selected resistant inbreds (061, B37HtN, and DS:74:1071) with susceptible inbred FR1141 and a population derived from a cross of B37 × B37HtN were evaluated for gray leaf spot severity in 1992 and 1993 at Urbana, IL, and Andrews, NC. Populations included the susceptible parent (P1), the resistant parent (P2), F1 and F2 generations, backcrosses BCP1 and BCP2, and, when space and seed were available, one or more of the F3, BCP1S1, and BCP2S1 generations. Plants at Urbana were inoculated, and naturally occurring disease was relied upon at Andrews. Individual plants were rated by visually estimating the percent leaf area blighted (necrotic). Generation mean analysis of data combined over years or locations indicated that a simple additive-dominance model was able to explain the inheritance of resistance for all populations. Dominance effects were detected in all population evaluated. For the FR1141 × 061 and FR1141 × B37HtN populations, dominance was significant at early ratings, but not at late ratings. Results from generation mean analysis for individual years, locations, and rating were variable.

scholarly journals Disease Severity and Yield of Sweet Corn Hybrids with Resistance to Northern Leaf Blight

Plant Disease ◽  
1998 ◽  
Vol 82 (1) ◽  
pp. 57-63 ◽  
Author(s):  
J. K. Pataky ◽  
R. N. Raid ◽  
L. J. du Toit ◽  
T. J. Schueneman
Keyword(s):  
Disease Severity ◽  
Partial Resistance ◽  
Yield Loss ◽  
Sweet Corn ◽  
Correlation Coefficients ◽  
Inbred Lines ◽  
Leaf Blight ◽  
Northern Leaf Blight ◽  
Corn Hybrids ◽  
Highly Correlated

Reactions of supersweet (sh2) sweet corn to northern leaf blight (NLB) and associated yields were evaluated in Belle Glade, Florida and Urbana, Illinois in yield-loss trials, hybrid evaluations, and evaluations of breeding materials. Hybrids differed significantly for NLB in all trials. Severity of NLB ranged from 0 to 66% on 35 sh2 hybrids in yield-loss trials, and from 0 to 60% on 80 sh2 hybrids in hybrid evaluations. NLB ratings ranged from 1 to 9 (approximately 0 to 80% severity) on 375 hybrids and 186 inbred lines in evaluations of breeding materials. Various methods of rating NLB and ratings from multiple dates were highly correlated, with correlation coefficients ranging from 0.76 to 0.98. Yield, measured as weight of ears and number of marketable ears from inoculated plots as a percentage of that from control plots, decreased as disease severity increased. Linear or quadratic regression models explained 31 to 70% of the variation in percent yield as a function of disease severity at harvest. The effects of NLB on yield were limited by NLB-resistance in several hybrids, including CCO 3268, Chieftain, Crisp N Sweet 710A, Day Star, Envy, Forever, GSS 1526, Jupiter, Midship, Prime Plus, Sch 5005, and SummerSweet 7630. Although high levels of partial resistance to NLB were prevalent among 375 new experimental sh2 hybrids and 186 sh2 inbred lines evaluated in 1995, use of the gene HtN may increase in the near future as breeders are incorporating this resistance into new inbreds and hybrids. Breeders and plant pathologists would be wise to continue improving partial resistance to NLB without using the gene HtN in genotypes with adequate levels of partial resistance, because the widespread use of the gene HtN will select for virulent races of Exserohilum turcicum which occur in Florida, or for races with new combinations of virulence.

scholarly journals Screening of maize germplasm for Turcicum leaf blight resistance

2018 ◽  
Vol 10 (1) ◽  
pp. 98-101
Author(s):  
T. A. Wani ◽  
G. N. Bhat ◽  
Mushtaq Ahmad ◽  
A. Anwar ◽  
Gul Zaffar
Keyword(s):  
Block Design ◽  
Inbred Lines ◽  
Leaf Blight ◽  
Blight Resistance ◽  
Exserohilum Turcicum ◽  
Maize Germplasm ◽  
Randomized Block Design ◽  
Maize Genotypes ◽  
Sorghum Grains ◽  
Moderately Resistant

: 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.

scholarly journals Genetic Mapping And Genomic Prediction For Northern Corn Leaf Blight (Exserohilum Turcicum (Pass.) Leonard And Suggs) Resistance

2021 ◽  
Author(s):  
D.C. Balasundara ◽  
H. C. Lohithaswa ◽  
M. Rahul ◽  
R. L. Ravikumar ◽  
Anand Pandravada ◽  
...  
Keyword(s):  
Genomic Prediction ◽  
Combining Ability ◽  
Inbred Lines ◽  
Leaf Blight ◽  
Environment Interaction ◽  
Exserohilum Turcicum ◽  
Northern Corn Leaf Blight ◽  
Polymorphic Snps ◽  
Corn Leaf Blight ◽  
Two Populations

Abstract Background: Northern corn leaf blight (NCLB) of maize caused by Exserohilum turcicum is a serious foliar disease. Resistance to NCLB is complexly inherited and the highly significant genotype x environment interaction effect makes selection of resistant genotypes difficult through conventional breeding methods. Hence an attempt was made to identify the genomic regions associated with NCLB resistance and perform genomic selection (GS) in two F2:3 populations derived from the crosses CM212 × MAI172 (Population-1) and CM202 × SKV50 (Population-2). Results: Two populations, each comprising of 366 progenies, were phenotyped at three different locations in the disease screening nurseries. Linkage analysis using 297 polymorphic SNPs in Population-1 and 290 polymorphic SNPs in Population-2 revealed 10 linkage groups spanning 3623.88cM and 4261.92cM with an average distance of 12.40 cM and 14.9 cM, respectively. Location-wise and pooled data across locations indicated that QTL expression was population and environment specific. The genomic prediction accuracies of 0.83 and 0.79 were achieved for NCLB Population 1 and Population 2, respectively. The resistant progenies from both populations were advanced to derive inbred lines and crossed with four different testers in line x tester mating design to test for their combining ability. High overall general combining ability was exhibited by 21 inbred lines. Among crosses 48 % were assigned high overall specific combining ability status. Out of 136 single crosses, seven recorded significant positive standard heterosis over the best check for grain yield. The clustering pattern of inbred lines developed from the two populations revealed high molecular diversity. Conclusions: In this study, comparatively better genomic prediction accuracies were achieved for NCLB and the worth of F3 progenies with high genomic predictions was proved by advancing them to derive inbred lines and establishing their higher combining ability for yield and yield related traits.

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