RECOMBINATION OF SOLANUM-BREVIDENS CHROMOSOMES IN THE 2ND BACKCROSS GENERATION FROM A SOMATIC HYBRID WITH SOLANUM-TUBEROSUM

被引:33
作者
MCGRATH, JM
WIELGUS, SM
UCHYTIL, TF
KIMLEE, H
HABERLACH, GT
WILLIAMS, CE
HELGESON, JP
机构
[1] UNIV WISCONSIN, USDA ARS, DEPT PLANT PATHOL, PLANT DIS RESISTANCE RES UNIT, MADISON, WI 53706 USA
[2] DONGGUK UNIV, DEPT AGROBIOL, SEOUL, SOUTH KOREA
关键词
POTATO; INTROGRESSION; WIDE HYBRIDS; RFLP; RAPD;
D O I
10.1007/BF00220797
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Solanum brevidens synteny groups were examined with 47 widely-distributed RFLP markers in 17 BC2 progeny from six fertile BC1 plants. The BC1 plants were derived from a single S. brevidens + S. tuberosum somatic hybrid backcrossed with S. tuberosum (potato). Probes which were linked in potato and tomato were also found to be syntenic along each of the 12 S. brevidens chromosomes. More than half of the S. brevidens synteny groups had lost one or more S. brevidens-specific RFLPs in the BC2, suggesting that recombination had occurred. For 8 of the 12 S. brevidens RFLP synteny groups, the frequency of recombinant chromosomes exceeded that of intact parental chromosomes. Using the RFLP data, 161 RAPD markers were tentatively located throughout the S. brevidens genome. Further analyses with 39 of these 161 RAPD markers generally showed that RAPD and RFLP results were comparable, but some inconsistencies were noted with 14 of the 39 RAPD markers. The extent of marker loss and the high frequency of synteny groups which were marked by a single S. brevidens-specific RFLP marker suggest that the S. brevidens chromosomes have some pairing affinity with potato chromosomes. This interaction should facilitate the transfer of novel disease-resistance traits into potato breeding lines. One plant was recovered with the chromosome number of S. tuberosum (2n=48) that carried a single S. brevidens RFLP marker, suggesting transfer of this S. brevidens marker into the genome of S. tuberosum.
引用
收藏
页码:917 / 924
页数:8
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