NDLI: Genetic basis and mapping of the resistance to Rice yellow mottle virus. III. Analysis of QTL efficiency in introgressed progenies confirmed the hypothesis of complementary epistasis between two resistance QTLs

Content Provider	Springer Nature Link
Author	Ahmadi, N. Albar, L. Pressoir, G. Pinel, A. Fargette, D. Ghesquière, A.
Copyright Year	2001
Abstract	Our previous studies have hypothesised that a complementary epistasis between a QTL located on chromosome 12 and a QTL located on chromosome 7 was one of the major genetic factors controlling partial resistance to Rice yellow mottle virus (RYMV). We report research undertaken to verify this hypothesis and to introgress the resistant allele of these two QTLs from an upland resistant japonica variety, Azucena, into a lowland susceptible indica variety IR64. Three cycles of molecular marker-assisted back cross breeding were performed using RFLP and microsatellite markers. Resistance to RYMV was evaluated in F2 and F3 offspring of the BC1 and BC2 generations. Marker-assisted introgression (MAI) was very efficient: in the selected BC3 progeny the proportion of the recipient genome was close to 95% for the ten non-carrier chromosomes, and the length of the donor chromosome segment surrounding the two QTLs was less than 20 cM. The relevancy of the complementary epistasis genetic model proposed previously was confirmed experimentally: in BC1 and BC2 generations only F3 lines having the allele of the resistant parent on QTL12 and QTL7 show partial resistance to RYMV. Comparison of our experimental process of MAI with the recommendations of analytic and simulation studies pointed out the methodological flexibility of MAI. Our results also confirmed the widely admitted, but rarely verified, assumption that QTL-alleles detected in segregating populations could be treated as units of Mendelian inheritance and that the incorporation of these alleles into elite lines would result in an enhanced performance. The next step will be the design of tools for the routine use of molecular markers in breeding for partial resistance to RYMV and the development of material for the analysis of resistance mechanisms and the structure of a virus resistance gene in rice.
Starting Page	1084
Ending Page	1092
Page Count	9
File Format	PDF
ISSN	00405752
Journal	Theoretical and Applied Genetics
Volume Number	103
Issue Number	6
e-ISSN	14322242
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-11-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Biotechnology Agronomy and Crop Science

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