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GrainGenes Reference Report: TAG-100-840

Reference	TAG-100-840
Title	Genomic regions affecting seed shattering and seed dormancy in rice
Journal	Theoretical and Applied Genetics
Year	2000
Volume	100
Pages	840-846
Author	Cai HW Morishima H
Abstract	Summary: Non-shattering of the seeds and reduced seed dormancy were selected consciously and unconsciously during the domestication of rice, as in other cereals. Both traits are quantitative and their genetic bases are not fully elucidated, though several genes with relatively large effects have been identified. In the present study, we attempted to detect genomic regions associated with shattering and dormancy using 125 recombinant inbred lines obtained from a cross between cultivated and wild rice strains. A total of 147 markers were mapped on 12 rice chromosomes, and QTL analysis was performed by simple interval mapping and composite interval mapping. For seed shattering, two methods revealed the same four QTLs. On the other hand, for seed dormancy a number of QTLs were estimated by the two methods. Based on the results obtained with the intact and de-hulled seeds, QTLs affecting hull-imposed dormancy and kernel dormancy, respectively, were estimated. Some QTLs detected by simple interval mapping were not significant by composite interval mapping, which reduces the effects of residual variation due to the genetic background. Several chromosomal regions where shattering QTLs and dormancy QTLs are linked with each other were found. This redundancy of QTL associations was explained by 'multifactorial linkages' followed by natural selection favoring these two co-adapted traits
External Databases	http://link.springer.de/link/service/journals/00122/bibs/0100006/01000840.htm
Keyword	[ Hide all but 1 of 37 ] bases cereal chromosome chromosome maps co-adapted gene block domestication dormancy gene genetic background genetic mapping genetic markers inbred lines interspecific hybridization linkage loci map mapping marker natural selection oryza rufipogon oryza sativa oryza sativa l. phenotypic variation population qtl qtl analysis quantitative traits recombinant inbred lines rflp rice rice chromosomes seed seed dormancy seed shattering selection wild wild rice

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