Genes for resistance to northern corn leaf blight in diverse maize populations

Welz, H. G.; Geiger, H. H.

doi:10.1046/j.1439-0523.2000.00462.x

Cited by 136 publications

(127 citation statements)

References 87 publications

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“…Upon detecting QTL in a single experiment, a key issue of interest is the generalizability of the findings. Many authors have compared results for different mapping populations based upon relative QTL position (Welz and Geiger, 2000;Kolb et al, 2001;Kamoshita et al, 2002;Simko, 2002;Clancy et al, 2003;Flint-Garcia et al, 2003;Toojinda et al, 2003;Tuberosa et al, 2003;Chardon et al, 2004). These comparisons have led to approaches in meta-analysis for QTL results (Goffinet and Gerber, 2000;Khatkar et al, 2004), and bioinformatic tools are being developed to facilitate this effort (Arcade et al, 2004;Sawkins et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Using mating designs to uncover QTL and the genetic architecture of complex traits

2005

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Analysis of quantitative trait loci (QTL) affecting complex traits is often pursued in single-cross experiments. For most purposes, including breeding, some assessment is desired of the generalizability of the QTL findings and of the overall genetic architecture of the trait. Single-cross experiments provide a poor basis for these purposes, as comparison across experiments is hampered by segregation of different allelic combinations among different parents and by contextdependent effects of QTL. To overcome this problem, we combined the benefits of QTL analysis (to identify genomic regions affecting trait variation) and classic diallel analysis (to obtain insight into the general inheritance of the trait) by analyzing multiple mapping families that are connected via shared parents. We first provide a theoretical derivation of main (general combining ability (GCA)) and interaction (specific combining ability (SCA)) effects on F 2 family means relative to variance components in a randomly mating reference population. Then, using computer simulations to generate F 2 families derived from 10 inbred parents in different partial-diallel designs, we show that QTL can be detected and that the residual among-family variance can be analyzed. Standard diallel analysis methods are applied in order to reveal the presence and mode of action (in terms of GCA and SCA) of undetected polygenes. Given a fixed experiment size (total number of individuals), we demonstrate that QTL detection and estimation of the genetic architecture of polygenic effects are competing goals, which should be explicitly accounted for in the experimental design. Our approach provides a general strategy for exploring the genetic architecture, as well as the QTL underlying variation in quantitative traits.

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Section: Introductionmentioning

confidence: 99%

Using mating designs to uncover QTL and the genetic architecture of complex traits

2005

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“…Qualitative resistance is typically race-specific and controlled by single genes (monogenic) whereas quantitative resistance is race non-specific and controlled by many genes [35,36]. However, [26] reported that host plant resistance is based on the effectiveness of resistance against all the virulence of the pathogen present in a region, therefore understanding the variability of E. turcicum will enhance breeding for resistance against the pathogen.…”

Section: World Journal Of Agricultural Researchmentioning

confidence: 99%

Assessment of Maize (Z<i>ea mays</i> L.) <i>Exserohium Turcicum</i> (Pass.) Leonard and Sugg. Isolates on Different Culture Media in Tanzania

Nwanosike¹,

Mabagala²

2017

WJAR

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Morphological characteristics of twenty five isolates of E. turcicum collected from Kilimanjaro, Arusha, Morogoro, Iringa, Njombe and Mbeya Regions in Tanzania were studied in four solid media namely; V8 vegetable juice agar, malt extract agar, maize leaf extract agar and potato dextrose agar. The experiment was conducted twice and replicated three times (3 replicate × 25 isolates × 4 media) for each medium, making a total of 300 plates. The inoculated cultures were arranged in a Complete Randomized Design (CRD) and incubated at 25±1°C. The statistically significant differences (P ≤ 0.05) in colony growth, conidia germination, dry mycelial weight and rate of sporulation on the four solid media indicated the possibility of different strains of E. turcicum in the studied areas. However, colony growth was aggressive in V8 juice agar (5.7 cm) but conidia germination and rate of sporulation were high in malt extract agar.

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“…Resistance to northern leaf blight (NLB) of maize, incited by Exserohilum turcicum, may be inherited monogenically (Hooker, 1961(Hooker, , 1963Hilu and Hooker, 1964) or polygenically (Leonard, 1993, Pataky et al, 1986. Five dominant genes, Ht, Ht2, Ht3, Htm1 and Htn1, control resistance to specific races of E. turcicum Welz and Geiger, 2000). Sporulation is suppressed or delayed in plants carrying these genes singly or in combination.…”

Section: Improving Host Resistancementioning

confidence: 99%

Use of IPM in the control of multiple diseases in maize: Strategies for selection of host resistance

Pratt

Gordon

Lipps

et al. 2004

African Crop Science Journal

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Maize (Zea mays) production in sub-Saharan Africa is constantly threatened by the potential outbreak of multiple foliar diseases such as maize streak, northern leaf blight, gray leaf spot, and rust. Improvement of host resistance to these diseases can provide an important component of integrated pest management (IPM). In this paper, conventional and molecular marker-assisted breeding approaches are reviewed and strategies for improvement of host resistance are presented. Pyramiding of quantitative resistance factors using molecular breeding techniques will be facilitated through cooperative research efforts and adoption of appropriate experimental designs.Key Words: Cercospora zeae-maydis, Exserohilum turcicum, gene pyramiding, molecular breeding, resistance breeding, Setosphaeria turcica RÉSUMÉLa production du maïs (Zea mays) en Afrique au sud du sahara est constamment menacée par l'apparution de multiple infections des feuilles par le streak, le mildiou, le brunissement des feuilles et moisissures. L'augmentation de la résistance a cette maladie peut apporter une importante composante de gestion intégrée de la peste (IPM). Dans cet article, l'approche de croisement assiste des marqueurs conventionels et moléculaires sont présentés et les stratégies d'amélioration de la résistance de la plante hote sont présentées. Les facteurs de résistances pyramidiques et quantitatives utilisant la technique de croisement moléculaires seront facilités à travers les efforts de recherches coopératives et l'adoption d'une approache expérimentale appropriée.

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Genes for resistance to northern corn leaf blight in diverse maize populations

Cited by 136 publications

References 87 publications

Using mating designs to uncover QTL and the genetic architecture of complex traits

Using mating designs to uncover QTL and the genetic architecture of complex traits

Assessment of Maize (Z<i>ea mays</i> L.) <i>Exserohium Turcicum</i> (Pass.) Leonard and Sugg. Isolates on Different Culture Media in Tanzania

Use of IPM in the control of multiple diseases in maize: Strategies for selection of host resistance

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