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High-resolution genetic mapping of a novel brown planthopper resistance locus, Bph34 in Oryza sativa L. X Oryza nivara (Sharma & Shastry) derived interspecific F2 population
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High-resolution genetic mapping of a novel brown planthopper resistance locus, Bph34 in Oryza sativa L. X Oryza nivara (Sharma & Shastry) derived interspecific F2 population
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High-resolution genetic mapping of a novel brown planthopper resistance locus, Bph34 in Oryza sativa L. X Oryza nivara (Sharma & Shastry) derived interspecific F2 population
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Journal Article
High-resolution genetic mapping of a novel brown planthopper resistance locus, Bph34 in Oryza sativa L. X Oryza nivara (Sharma & Shastry) derived interspecific F2 population
2018
Overview
Key message
A BPH-resistant locus designated as
Bph34
identified in
Oryza nivara
acc. IRGC104646 on long arm of chromosome 4 using high-resolution mapping with 50 K SNP chip. BPH resistance contributed by locus showed dominant inheritance in F
2
and F
3
. The
Bph34
locus is 91 kb in size and contains 11 candidate genes. In addition to SNP markers, SSR markers, RM16994 and RM17007 co-segregated with the BPH resistance. These two SSR markers can facilitate marker-assisted transfer of the
Bph34
locus into elite rice cultivars in all labs.
Brown planthopper (BPH,
Nilaparvata lugen
Stål) is one of the most destructive insects of rice (
Oryza sativa
L.) causing significant yield losses annually. Exploiting host plant resistance to BPH and incorporating resistant genes in susceptible commercial cultivars is economical and environmentally friendly approach to manage this pest. Here, we report high-resolution mapping of a novel genetic locus for resistance to BPH, designated as
Bph34
on long arm of rice chromosome 4. The locus was mapped using an interspecific F
2
population derived from a cross between susceptible
indica
cultivar PR122 and BPH-resistant wild species,
O. nivara
acc. IRGC104646. Inheritance studies performed using F
2
and F
2:3
populations revealed the presence of single dominant gene. Construction of high-density linkage map using 50 K SNP chip (OsSNPnks) followed by QTL mapping identified single major locus at 28.8 LOD score between SNP markers, AX-95952039 and AX-95921548. The major locus contributing resistance to BPH designated as
Bph34
and explained 68.3% of total phenotypic variance. The
Bph34
locus is 91 Kb in size on Nipponbare reference genome-IRGSP-1.0 and contains 11 candidate genes. In addition to associated SNP markers, two SSR markers, RM16994 and RM17007, also co-segregated with the
Bph34
which can be used efficiently for markers assisted transfer into elite rice cultivars across the labs.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
