Alignment of genetic maps and QTLs between inter- and intra-specific sorghum populations

被引:129
作者
Feltus, FA
Hart, GE
Schertz, KF
Casa, AM
Kresovich, S
Abraham, S
Klein, PE
Brown, PJ
Paterson, AH
机构
[1] Univ Georgia, Plant Genome Mapping Lab, Athens, GA 30602 USA
[2] Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USA
[3] USDA, College Stn, TX 77843 USA
[4] Cornell Univ, Inst Genom Divers, Ithaca, NY 14853 USA
[5] Cornell Univ, Dept Plant Breeding, Ithaca, NY 14853 USA
[6] Rubber Res Inst India, Kottayam 686009, Kerala, India
[7] Texas A&M Univ, Inst Plant Genom & Biotechnol, College Stn, TX 77843 USA
关键词
D O I
10.1007/s00122-006-0232-3
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
To increase the value of associated molecular tools and also to begin to explore the degree to which interspecific and intraspecific genetic variation in Sorghum is attributable to corresponding genetic loci, we have aligned genetic maps derived from two sorghum populations that share one common parent (Sorghum bicolor L. Moench accession BTx623) but differ in morphological and evolutionarily distant alternate parents (S. propinquum or S. bicolor accession IS3620C). A total of 106 well-distributed DNA markers provide for map alignment, revealing only six nominal differences in marker order that are readily explained by sampling variation or mapping of paralogous loci. We also report a total of 61 new QTLs detected from 17 traits in these crosses. Among eight corresponding traits (some new, some previously published) that could be directly compared between the two maps, QTLs for two (tiller height and tiller number) were found to correspond in a non-random manner (P < 0.05). For several other traits, correspondence of subsets of QTLs narrowly missed statistical significance. In particular, several QTLs for leaf senescence were near loci previously mapped for 'stay-green' that have been implicated by others in drought tolerance. These data provide strong validation for the value of molecular tools developed in the interspecific cross for utilization in cultivated sorghum, and begin to separate QTLs that distinguish among Sorghum species from those that are informative within the cultigen (S. bicolor).
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页码:1295 / 1305
页数:11
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