Differentiation of Meloidogyne incognita and M-arenaria novel resistance phenotypes in Lycopersicon peruvianum and derived bridge lines

被引:20
作者
Veremis, JC [1 ]
Roberts, PA [1 ]
机构
[1] UNIV CALIF RIVERSIDE, DEPT NEMATOL, RIVERSIDE, CA 92521 USA
关键词
heat-sensitivity; virulence; tomato; root-knot nematodes; bridge-line;
D O I
10.1007/BF00224099
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Lycopersicon peruvianum PI 270435 clone 2R2 and PI 126443 clone 1MH were crossed reciprocally with three L. esculentum-L. peruvianum bridge-lines. The incongruity barrier between the two plant species was overcome; F-1 progeny were obtained from crosses between four parental combinations without embryo-rescue culture. Hybridity was confirmed by leaf and flower morphology and by the production of nematode-resistant F-1 progeny on homozygous susceptible parents. Clones of the five F-1 bridge-line hybrids were highly resistant to Mi-avirulent root-knot nematode (Meloidogyne incognita) at both 25 degrees C and 30 degrees C soil temperatures. However, only clones from PI 270435-3MH and PI 126443-1MH, and hybrids from PI 126443-1MH, were resistant to Mi-virulent M. incognita isolates at high soil temperature. Clones and hybrids from PI 270435-2R2 were not resistant to two Mi-virulent M. incognita isolates at high soil temperature. A source of heat-stable resistance was identified in bridge-line EPP-2, and was found to be derived from L. peruvianum LA 1708. Accessions of the L. peruvianum 'Maranon races', LA 1708 and LA 2172, and bridge-line EPP-2, segregated for heat-stable resistance to Mi-avirulent M. incognita, but were susceptible to Mi-virulent M. incognita isolates. Clone LA 1708-I conferred heal-stable resistance to M. arenaria isolate W, which is virulent to heat-stable resistance genes in L. peruvianum PI 270435-2R2, PI 270435-3MH, and PI 126443-1MH. Clone LA 1708-I has a distinct heat-stable factor for resistance to Mi-avirulent M. arenaria isolate W, for which the gene symbol Mi-4 is proposed. A Mi-virulent M. arenaria isolate Le Grau du Roi was virulent on all Lycopersicon spp. accessions tested, including those with novel resistance genes.
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页码:960 / 967
页数:8
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