Inheritance of Virulence in Helminthosporium turcicum to Monogenic Resistant Corn

Lim, Sung-Bin

doi:10.1094/phyto-64-1150

Cited by 21 publications

(9 citation statements)

References 2 publications

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“…Since the pathosystem studied fits the gene-to-gene model proposed by Flor (Lim et al, 1974), the genetic resistance basis of L30R and L40 could be evaluated from the reaction of the maize lines Pa91, Pa91Ht 1 Ht 1 , Pa91Ht 2 Ht 2 , Pa91Ht 3 Ht 3 , Pa91HtNHtN, by the maize set L30 [L30R, L30S, and (L30R x L30S)], by the L40 line, as well as by the F 1 (L30R x L40) and F 1 (L30S x L40) maize hybrids when inoculated with E. turcicum isolates 18, 47 or 49 (Table 1; Figure 1). The disease reactions of L30R, L30S, (L30R x L30S), L40, F 1 (L30R x L40), and F 1 (L30S x L40) differed from the ones presented by the set of near-isogenic lines Pa91 when inoculated with isolates 18, 47 and 49.…”

Section: Resultsmentioning

confidence: 99%

New resistance genes in the Zea mays: exserohilum turcicum pathosystem

et al. 2005

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The use of monogenic race-specific resistance is widespread for the control of maize (Zea mays L.) helminthosporiosis caused by Exserohilum turcicum. Inoculation of 18 Brazilian isolates of E. turcicum onto elite maize lines containing previously identified resistance genes and onto differential near-isogenic lines allowed the identification of new qualitative resistance genes. The inoculation of one selected isolate on differential near-isogenic lines, F 1 generations and a BC 1 F 1 population from the referred elite lines enabled the characterization of the resistance spectrum of three new genes, one dominant (HtP), one recessive (rt) and a third with non-identified genetic action. Three physiological races of the pathogen were also identified including two with new virulence factors capable of overcoming the resistance of one of the resistance genes identified here (rt).

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Section: Resultsmentioning

confidence: 99%

New resistance genes in the Zea mays: exserohilum turcicum pathosystem

et al. 2005

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“…A number of authors have suggested that E. turcicum exhibits a hemibiotrophic interaction with maize (Lim et al, 1974;Leonard et al, 1989;Chung et al, 2010;Ohm et al, 2012;Wu & Turgeon, 2013). This is based on observations of only limited damage in the host tissue during the early phase of infection and an extended incubation period with no visible symptoms before the development of necrotic lesions on the leaves in the later phases of infection.…”

Section: Discussionmentioning

confidence: 99%

A histological assessment of the infection strategy of Exserohilum turcicum in maize

et al. 2018

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Northern leaf blight is a lethal foliar disease of maize caused by the fungus Exserohilum turcicum. The aim of this study was to elucidate the infection strategy of the fungus in maize leaves using modern microscopy techniques and to understand better the hemibiotrophic lifestyle of E. turcicum. Leaf samples were collected from inoculated B73 maize plants at 1, 4, 9, 11, 14 and 18 days post‐inoculation (dpi). Samples were prepared according to standard microscopy procedures and analysed using light microscopy as well as scanning (SEM) and transmission electron microscopy (TEM). Microscopic observations were preceded by macroscopic observations for each time point. The fungus penetrated the leaf epidermal cells at 1 dpi and the disease was characterized by chlorotic leaf flecks. At 4 dpi the chlorotic flecks enlarged to form spots, and at 9 dpi hyphae were seen in the epidermal cells surrounding the infection site. At 11 dpi lesions started to form on the leaves and SEM revealed the presence of hyphae in the vascular bundles. At 14 dpi the xylem was almost completely blocked by hyphal growth. Hyphae spread into the adjacent bundle sheath cells causing cellular damage, characterized by plasmolysis, at 18 dpi and conidiophores formed through the stomata. Morphologically, lesions started to enlarge and coalesce leading to wilting of leaves. This study provides an updated, detailed view of the infection strategy of E. turcicum in maize and supports previous findings that E. turcicum follows a hemibiotrophic lifestyle.

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“…Plants homozygous for Ht gene have the highest level of resistance however it confer comparatively less protection to the host than in the case of polygenic resistance under conditions of heavy epiplytotics. Lim et al (1974) reported that the progeny from a cross between the isolates of E. turcicum avirulent and virulent to monogenic Ht 1 resistant line in maize suggested in a 3:1 ratio indicate that the virulence in the pathogen is monogenic in nature. Maize Ht 2 conditioned resistance to both the parental isolates.…”

Section: Genetics Of Resistancementioning

confidence: 99%

Sources of resistance toExserohilum turcicum(Pass.) andPuccinia polysora(Underw.) incitant of Turcicum leaf blight and polysora rust of maize

Kumar

Gowda²,

Pant

et al. 2011

Archives Of Phytopathology And Plant Protection

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A study was carried out to identify the sources of resistance to Turcicum leaf blight (TLB) and polysora rust in maize. Sixty indigenous and exotic inbred lines were evaluated under artificial epiphytotic conditions at two identified hot spot locations, Almora and Nagenahalli. After two years continuous screening, a total of 20 inbred lines were identified as a sources of resistance at both the locations for TLB, whereas 10 inbred lines were identified resistant against Polysora rust at Nagenahalli. A clear cut variation in virulence pattern in case of E. turcicum was observed. Some of the inbred inbred lines, i.e CM 138, CM 212, IML 235, NAI 135, showed resistant reaction in both the locations in the year 2005, whereas they acted as susceptible in 2006 at both locations. It was also observed that the Nagenahalli isolate of E. turcicum was more virulent than the Almora isolate.

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Inheritance of Virulence in Helminthosporium turcicum to Monogenic Resistant Corn

Cited by 21 publications

References 2 publications

New resistance genes in the Zea mays: exserohilum turcicum pathosystem

New resistance genes in the Zea mays: exserohilum turcicum pathosystem

A histological assessment of the infection strategy of Exserohilum turcicum in maize

Sources of resistance toExserohilum turcicum(Pass.) andPuccinia polysora(Underw.) incitant of Turcicum leaf blight and polysora rust of maize

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