Characterization of root-knot nematode resistance in Medicago truncatula

被引：3

作者：

Dhandaydham, Murali ^{[1
]}

Charles, Lauren ^{[1
]}

Zhu, Hongyan ^{[2
]}

Starr, James L. ^{[3
]}

Huguet, Thierry ^{[4
]}

Cook, Douglas R. ^{[2
]}

Prosperi, Jean-Marie ^{[5
]}

Opperman, Charles ^{[1
]}

机构：

[1] N Carolina State Univ, Ctr Biol Nematode Parasitism, Campus Box 7253, Raleigh, NC 27695 USA

[2] Univ Calif Davis, Dept Plant Pathol, Davis, CA 95616 USA

[3] Texas A&M Univ, Dept Plant Pathol & Microbiol, College Stn, TX 77843 USA

[4] INRA, CNRS, UMR215, F-31326 Castanet Tolosan, France

[5] INRA, SGAP, Domaine Melgueil, F-34060 Montpellier, France

来源：

JOURNAL OF NEMATOLOGY | 2008年 / 40卷 / 01期

关键词：

root-knot nematode; cyst nematode; resistance; Medicago truncatula; host range; genetics;

D O I：

暂无

中图分类号：

Q95 [动物学];

学科分类号：

071002 ;

摘要：

Root knot (Meloidogyne spp.) and cyst (Heterodera and Globodern spp.) nematodes infect all important crop species, and the annual economic loss due these pathogens exceeds $90 billion. We screened the worldwide accession collection with the nematodes Meloidogyne incognita, M. arenaria and M. hapla, soybean cyst nematode (SCN-Heterodera glycines), sugar beet cyst nematode (SBCN-Heterodera schachtii) and clover cyst nematode (CLCN-Heterodera trifolii), revealing resistant and susceptible accessions. In the over 100 accessions evaluated, we observed a range of responses to the root-knot nematode species, and a non-host response was observed for SCN and SBCN infection. However, variation was observed with respect to infection by CLCN. While many cultivars including Jemalong A17 were resistant to H. trifolli, cultivar Paraggio was highly susceptible. Identification of M. truncatula as a host for root-knot nematodes and IT trifolii and the differential host response to both RKN and CLCN provide the opportunity to genetically and molecularly characterize genes involved in plant-nematode interaction. Accession DZA045, obtained from an Algerian population, was resistant. to all three root-knot nematode species and was used for further studies. The mechanism of resistance in DZA045 appears different front Mi-mediated root-knot nematode resistance in tomato. Temporal analysis of nematode infection showed that there is no difference in nematode penetration between the resistant and susceptible accessions, and no hypersensitive response was observed in the resistant accession even several days after infection. However, less than 5% of the nematode population completed the life cycle as females in the resistant. accession. The remainder emigrated from the roots, kdeveloped its males, or died inside the roots as undeveloped larvae. Genetic analyses carried out by crossing DZA045 with a susceptible French accession, F83005, suggest that one gene controls resistance in DZA045.

引用

页码：46 / 54

页数：9

共 52 条

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