The <i>Aegilops ventricosa</i> segment on chromosome 2AS of the wheat cultivar ‘VPM1’ carries the cereal cyst nematode resistance gene <i>Cre5</i>

Jahier,; Abelard,; Tanguy,; Dedryver,; Rivoal,; Khatkar,; Bariana,

doi:10.1046/j.1439-0523.2001.00585.x

Cited by 98 publications

(49 citation statements)

References 11 publications

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“…Cre3 and Cre6 provide better resistance than Cre1 against pathotype Ha13, but they are susceptible to Ha11 and Ha12 (Ogbonnaya et al 2001). Cre5 confers partial resistance to Ha12, Ha41, and Ha13 pathotypes of H. avenae (Rivoal et al 1993;Jahier et al 2001;Ogbonnaya et al 2001 Resistance Nursery, containing seven of the known Cre genes, has been distributed to collaborators around the world in order to establish the value of these genes in different regions. Pathotypes are differentiated by testing unknown populations against a matrix of cereals in the International Cereal Test Assortment for defining CCN pathotypes, developed by Andersen and Andersen (1982).…”

Section: Ccn Pathotypesmentioning

confidence: 99%

The importance and management strategies of cereal cyst nematodes, Heterodera spp., in Turkey

Dababat¹,

İmren

Erginbaş-Orakci³

et al. 2014

Euphytica

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Cereal cyst nematodes (CCNs) can cause significant economic yield losses alone or in combination with other biotic and abiotic factors. The damage caused by these nematodes can be enormous when they occur in a disease complex, particularly in areas subject to water stress. Of the 12 valid CCN species, Heterodera avenae, H. filipjevi, and H. latipons are considered the most economically important in different parts of the world. This paper reviews current approaches to managing CCNs via genetic resistance, biological agents, cultural practices, and chemical strategies. Recent research within the soil borne pathogen program of the International Maize and Wheat Improvement Center has focused on germplasm screening, the potential of this germplasm as sources of resistance, and how to incorporate new sources of resistance into breeding programs. Breeding for resistance is particularly complicated and difficult when different species and pathotypes coexist in nature. A lack of expertise and recognition of CCNs as a factor limiting wheat production potential, combined with inappropriate breeding strategies and slow screening processes limit genetic gains for resistance to CCNs.

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Section: Ccn Pathotypesmentioning

confidence: 99%

The importance and management strategies of cereal cyst nematodes, Heterodera spp., in Turkey

Dababat¹,

İmren

Erginbaş-Orakci³

et al. 2014

Euphytica

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“…Helguera et al (2003) developed PCR primers based on existing RFLP markers for the Lr37 Yr17 Sr38 gene cluster. Jahier et al (2001) established the exact location of the Cre5 gene for resistance to cereal cyst nematode. The most widely known molecular markers linked to Aegilops-derived leaf rust resistance genes are listed in Table 5.…”

Section: Cytogenetic and Molecular Characterization Of Aegilops Specimentioning

confidence: 99%

Utilisation of Aegilops (goatgrass) species to widen the genetic diversity of cultivated wheat

2007

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Wild Aegilops species related to cultivated wheat (Triticum spp.) possess numerous genes of agronomic interest and can be valuable sources of resistance to diseases, pests and extreme environmental factors. These genes can be incorporated into the wheat genome via intergeneric crossing, following, where necessary, the development of chromosome addition and substitution lines from the resulting hybrids. The transfer of a single segment from an alien chromosome can be achieved by translocations. The Aegilops (goatgrass) species, which are the most closely related to wheat, exhibit great genetic diversity, the exploitation of which has been the subject of experimentation for more than a century. The present paper gives a survey of the results achieved to date in the field of wheat-Aegilops hybridisation and gene transfer. The Aegilops genus consists of 11 diploid, 10 tetraploid and 2 hexaploid species. Of these 23 Aegilops species, most of the diploids (Ae. umbellulata Zhuk., Ae. mutica Boiss., Ae. bicornis (Forssk.) Jaub. & Spach, Ae. searsii Feldman & Kislev ex Hammer, Ae. caudata L., Ae. sharonensis Eig, Ae. speltoides Tausch, Ae. longissima Schweinf. & Muschl.) and several polyploids (Ae. ventricosa Tausch, Ae. peregrina (Hack. In J. Fraser) Marie & Weiller, Ae. geniculata Roth, Ae. kotschyi Boiss., Ae.biuncialis L.) have been used to develop wheatAegilops addition lines. Wheat-Aegilops substitution lines were developed using several species, including Ae. umbellulata, Ae. caudata, Ae. tauschii, Ae. speltoides, Ae. sharonensis, Ae. longissima and Ae. geniculata. Translocations carrying genes responsible for useful agronomic traits were developed with Ae. umbellulata, Ae. comosa, Ae. ventricosa, Ae. longissima, Ae. speltoides and Ae. geniculata. A large number of genes were transferred from Aegilops species to cultivated wheat, including those for resistance to leaf rust, stem rust, yellow rust and powdery mildew, and various pests (cereal cyst nematode, root knot nematode, Hessian fly, greenbug). Many molecular markers are linked to these resistance genes. The development of new molecular markers is also underway. There are still many untapped genetic resources in Aegilops species that could be used as resistance sources for plant breeding.

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“…ventricosa 6M v (6D) substitution and 6M v addition lines (Jahier et al 1996. This gene confers partial resistance to French (Ha12 and Ha41) and Australian (Ha13) CCN-pathotypes (Dosba et al 1978;Rivoal et al 1986Rivoal et al , 1993Jahier et al 2001;Ogbonnaya et al 2001). RG analogs associated with Cre5, have also recently been isolated (Seah et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Biochemical and genetic studies of two Heterodera avenae resistance genes transferred from Aegilops ventricosa to wheat

Montes¹,

López-Braña²,

Balseiro-Romero

et al. 2003

Theor Appl Genet

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Two Heterodera avenae resistance genes, Cre2 from Aegilops ventricosa AP-1 and Cre5 from Ae. ventricosa #10, were shown to confer a high level of resistance to the Spanish pathotype Ha71. No susceptible plants were found in the F(2) progeny from the cross between the two accessions of Ae. ventricosa, suggesting that their respective resistance factors were allelic. However, genes Cre2 and Cre5 apparently were transferred to a different chromosomal location in the wheat line H-93-8 and in the 6M(v)(6D) substitution, respectively, as proved by F(2) segregation of their cross progeny. The induction of several defence responses during early infection by the same H. avenae pathotype in resistant lines carrying Cre2 or Cre5 genes was studied. Isoelectrofocusing (IEF) isozyme analysis revealed that peroxidase, esterase and superoxide dismutase activity increased after nematode infection, in roots of resistant lines in comparison with their susceptible parents. Differential induced isoforms were also identified when IEF patterns of resistant lines were compared. A DNA marker, absent in Cre5-carrying genotypes, was found to be linked, thought not very tightly, to the Cre2 gene in the H-93-8 line. The differences observed between the Cre2 and Cre5 genes with respect to their chromosomal location in wheat introgression lines, de-toxificant enzyme induction and behaviour against different pathotypes, suggest they are different H. avenae resistance sources for wheat breeding.

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The Aegilops ventricosa segment on chromosome 2AS of the wheat cultivar ‘VPM1’ carries the cereal cyst nematode resistance gene Cre5

Cited by 98 publications

References 11 publications

The importance and management strategies of cereal cyst nematodes, Heterodera spp., in Turkey

The importance and management strategies of cereal cyst nematodes, Heterodera spp., in Turkey

Utilisation of Aegilops (goatgrass) species to widen the genetic diversity of cultivated wheat

Biochemical and genetic studies of two Heterodera avenae resistance genes transferred from Aegilops ventricosa to wheat

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