Mapping of quantitative trait loci conferring resistance to brown spot in flue‐cured tobacco (Nicotiana tabacum L.)

With 2 figures and 1 table ABSTRACT: Brown spot (BS) caused by Alternaria alternata is one of the most destructive foliar diseases affecting tobacco (Nicotiana tabacum L.) production and quality in China. Breeding of BS‐resistant cultivars is difficult because the resistance has proved to be quantit...

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Veröffentlicht in:Plant breeding 2012-04, Vol.131 (2), p.335-339
Hauptverfasser: Tong, Zhijun, Jiao, Tianlei, Wang, Fengqing, Li, Meiyun, Leng, Xiaodong, Gao, Yulong, Li, Yongping, Xiao, Bingguang, Wu, Weiren
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container_end_page 339
container_issue 2
container_start_page 335
container_title Plant breeding
container_volume 131
creator Tong, Zhijun
Jiao, Tianlei
Wang, Fengqing
Li, Meiyun
Leng, Xiaodong
Gao, Yulong
Li, Yongping
Xiao, Bingguang
Wu, Weiren
description With 2 figures and 1 table ABSTRACT: Brown spot (BS) caused by Alternaria alternata is one of the most destructive foliar diseases affecting tobacco (Nicotiana tabacum L.) production and quality in China. Breeding of BS‐resistant cultivars is difficult because the resistance has proved to be quantitatively inherited. To facilitate marker‐assisted selection, we carried out a study of mapping quantitative trait loci (QTLs) for BS resistance. We developed an F2 population consisting of 213 individuals from a cross between a BS‐susceptible cultivar ‘Changbohuang’ (CBH) and a BS‐resistant cultivar ‘Jinyehuang’ (JYH) and constructed a genetic map consisting of 196 simple sequence repeat (SSR) markers based on this population. Using disease index (DI) as the indicator of BS resistance, we detected three QTLs located between SSR markers TM20534 and TM10737, TM10589 and TM10216, and TM10443 and PT60669, respectively. The resistant alleles of the three QTLs were all from the resistant parent JYH. The three QTLs together could explain ∼86% of the DI difference between the two parents in total, with ∼61% explained by their additive effects. Therefore, the three QTLs will be useful for BS‐resistance breeding.
doi_str_mv 10.1111/j.1439-0523.2011.01940.x
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Breeding of BS‐resistant cultivars is difficult because the resistance has proved to be quantitatively inherited. To facilitate marker‐assisted selection, we carried out a study of mapping quantitative trait loci (QTLs) for BS resistance. We developed an F2 population consisting of 213 individuals from a cross between a BS‐susceptible cultivar ‘Changbohuang’ (CBH) and a BS‐resistant cultivar ‘Jinyehuang’ (JYH) and constructed a genetic map consisting of 196 simple sequence repeat (SSR) markers based on this population. Using disease index (DI) as the indicator of BS resistance, we detected three QTLs located between SSR markers TM20534 and TM10737, TM10589 and TM10216, and TM10443 and PT60669, respectively. The resistant alleles of the three QTLs were all from the resistant parent JYH. The three QTLs together could explain ∼86% of the DI difference between the two parents in total, with ∼61% explained by their additive effects. 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Breeding of BS‐resistant cultivars is difficult because the resistance has proved to be quantitatively inherited. To facilitate marker‐assisted selection, we carried out a study of mapping quantitative trait loci (QTLs) for BS resistance. We developed an F2 population consisting of 213 individuals from a cross between a BS‐susceptible cultivar ‘Changbohuang’ (CBH) and a BS‐resistant cultivar ‘Jinyehuang’ (JYH) and constructed a genetic map consisting of 196 simple sequence repeat (SSR) markers based on this population. Using disease index (DI) as the indicator of BS resistance, we detected three QTLs located between SSR markers TM20534 and TM10737, TM10589 and TM10216, and TM10443 and PT60669, respectively. The resistant alleles of the three QTLs were all from the resistant parent JYH. The three QTLs together could explain ∼86% of the DI difference between the two parents in total, with ∼61% explained by their additive effects. Therefore, the three QTLs will be useful for BS‐resistance breeding.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/j.1439-0523.2011.01940.x</doi><tpages>5</tpages></addata></record>
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source Wiley Online Library Journals Frontfile Complete
subjects Agronomy. Soil science and plant productions
alleles
Alternaria alternata
Biological and medical sciences
breeding
Brown spot
Classical and quantitative genetics. Population genetics. Molecular genetics
cultivars
Foliar diseases
Fundamental and applied biological sciences. Psychology
Gene mapping
Generalities. Genetics. Plant material
Genetic markers
Genetics
Genetics and breeding of economic plants
Genomics
Genotype & phenotype
inheritance (genetics)
marker-assisted selection
microsatellite repeats
Molecular genetics
Nicotiana tabacum
parents
Plant breeding
Quantitative trait loci
quantitative trait locus
Simple sequence repeats
tobacco
tobacco (Nicotiana tabacum L.)
Varietal selection. Specialized plant breeding, plant breeding aims
title Mapping of quantitative trait loci conferring resistance to brown spot in flue‐cured tobacco (Nicotiana tabacum L.)
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