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Identification of loci contributing to quantitative field resistance to blackleg disease, causal agent Leptosphaeria maculans (Desm.) Ces. et de Not., in Winter rapeseed (Brassica napus L.)

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Theoretical and Applied Genetics : Volume 95

Theoretical and Applied Genetics : Volume 94

Identification of loci contributing to quantitative field resistance to blackleg disease, causal agent Leptosphaeria maculans (Desm.) Ces. et de Not., in Winter rapeseed (Brassica napus L.)

Content Provider	Springer Nature Link
Author	Pilet, M. L. Delourme, R. Foisset, N. Renard, M.
Copyright Year	1998
Abstract	Blackleg, caused by Leptosphaeria maculans, is one of the most important diseases of Brassica napus. Genomic regions controlling blackleg resistance at the adult plant stage were detected using 152 doubled-haploid (DH) lines derived from the F1‘Darmor-bzh’×‘Yudal’. The rapeseed genetic map used includes 288 DNA markers on 19 linkage groups. Blackleg resistance of each DH line was evaluated in field tests in 1995 and 1996 by measuring the mean disease index (I) and the percentage of lost plants (P). From notations recovered in 1995, ten quantitative trait loci (QTL) were detected: seven QTL for I and six QTL for P, explaining 57% and 41% of the genotypic variation, respectively. Three of them were common to I and P. From data recovered in 1996, seven QTL were identified: five QTL for I and two different QTL for P, accounting for 50% and 23% of the genotypic variation, respectively. One I QTL, located close to a dwarf gene (bzh), was detected with a very strong effect, masking more QTL detection. It was not revealed at the same position and with the same effect in 1995. Four major genomic regions were revealed from 1995 and from 1996 with the same parental contribution. One of them, located on the DY2 group, has a resistance allele from the susceptible parent. Five- and two-year-specific QTL were detected in 1995 and 1996, respectively.
Starting Page	23
Ending Page	30
Page Count	8
File Format	PDF
ISSN	00405752
Journal	Theoretical and Applied Genetics
Volume Number	96
Issue Number	1
e-ISSN	14322242
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-01-23
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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Identification of loci contributing to quantitative field resistance to blackleg disease, causal agent Leptosphaeria maculans (Desm.) Ces. et de Not., in Winter rapeseed (Brassica napus L.)

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