VARIATION OF MOLECULAR MARKERS AMONG GEOGRAPHICALLY DIVERSE ACCESSIONS OF TRITICUM-TAUSCHII

被引:139
作者
LUBBERS, EL
GILL, KS
COX, TS
GILL, BS
机构
[1] KANSAS STATE UNIV AGR & APPL SCI, DEPT AGRON, USDA ARS, PLANT SCI & ENTOMOL RES UNIT, MANHATTAN, KS 66506 USA
[2] KANSAS STATE UNIV AGR & APPL SCI, DEPT PLANT PATHOL, MANHATTAN, KS 66506 USA
关键词
GERM PLASM; AEGILOPS-SQUARROSA; DIVERSITY; RESTRICTION FRAGMENT LENGTH POLYMORPHISM;
D O I
10.1139/g91-057
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Triticum tauschii (Coss.) Schmal. (genome DD), a diploid progenitor of hexaploid wheat (Triticum aestivum L.; AABBDD), grows across large areas of southwest Asia and contains more genetic variability for disease and insect resistance, isozymes, and seed storage proteins than the D genome of T. aestivum. To study patterns of variability at a large number of loci, we determined restriction fragment length polymorphism genotypes at 25 loci in a germ-plasm collection of 102 T. tauschii accessions. All accessions were homozygous at all loci, so "alleles" and "genotypes" were equivalent. Twenty loci were polymorphic, with two to six genotypes per locus and polymorphic indexes ranging from 0.06 to 0.74. Linkage disequilibrium was widespread. On the basis of Hedrick's probability of genotypic identity, botanical varieties T. t. ssp. eusquarrosa var. typica and T. t. ssp. eusquarrosa var. anathera were very similar to each other, as were T. t. ssp. strangulata and T. t. ssp. eusquarrosa var. meyeri, with a large genetic distance between these two pairs of taxonomic groups. Genetic variability for molecular markers was highest near the Caspian Sea, intermediate in Afghanistan, and lowest in Turkey and Pakistan. Genetic and geographical distances were related and generally consistent with the hypothesis that T. tauschii originated near the southern or southwestern coast of the Caspian Sea. Unique genotypes were found in most regions. The results of this study, along with data on economically relevant traits, will provide a basis for selecting breeding parents from the T. tauschii germ-plasm collection.
引用
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页码:354 / 361
页数:8
相关论文
共 49 条
[1]  
Appels R., 1984, STADLER GENET S, V16, P529
[2]   DISTRIBUTION OF GENETIC-VARIABILITY IN A DURUM-WHEAT WORLD COLLECTION [J].
ASINS, MJ ;
CARBONELL, EA .
THEORETICAL AND APPLIED GENETICS, 1989, 77 (02) :287-294
[3]   A FORTRAN PROGRAM FOR THE CALCULATION AND ANALYSIS OF 2-LOCUS LINKAGE DISEQUILIBRIUM COEFFICIENTS [J].
BLACK, WC ;
KRAFSUR, ES .
THEORETICAL AND APPLIED GENETICS, 1985, 70 (05) :491-496
[4]   EXOTIC GERMPLASM FOR IMPROVING GRAIN-YIELD AND GROWTH-RATE IN PEARL-MILLET [J].
BRAMELCOX, PJ ;
ANDREWS, DJ ;
FREY, KJ .
CROP SCIENCE, 1986, 26 (04) :687-690
[5]  
BRAMELCOX PJ, 1989, P ANN CORN SORGHUM R, V43, P13
[6]   ENZYME POLYMORPHISM IN PLANT-POPULATIONS [J].
BROWN, AHD .
THEORETICAL POPULATION BIOLOGY, 1979, 15 (01) :1-42
[7]   GENETIC-VARIABILITY FOR DESIRABLE AGRONOMIC TRAITS IN POPULATIONS CONTAINING GLYCINE-SOJA GERMPLASM [J].
CARPENTER, JA ;
FEHR, WR .
CROP SCIENCE, 1986, 26 (04) :681-686
[8]   COMBINING ABILITY AND THE SELECTION OF PARENTS FOR INTERSPECIFIC OAT MATINGS [J].
COX, DJ ;
FREY, KJ .
CROP SCIENCE, 1984, 24 (05) :963-967
[9]   AGRONOMIC PERFORMANCE OF HEXAPLOID WHEAT LINES DERIVED FROM DIRECT CROSSES BETWEEN WHEAT AND AEGILOPS-SQUARROSA [J].
COX, TS ;
HATCHETT, JH ;
GILL, BS ;
RAUPP, WJ ;
SEARS, RG .
PLANT BREEDING, 1990, 105 (04) :271-277
[10]   POTENTIAL OF WILD GERMPLASM FOR INCREASING YIELD OF GRAIN-SORGHUM [J].
COX, TS ;
HOUSE, LR ;
FREY, KJ .
EUPHYTICA, 1984, 33 (03) :673-684