Identification of QTLs and possible candidate genes conferring sheath blight resistance in rice (Oryza sativa L.)
Sheath blight, caused by the pathogenic fungus Rhizoctonia solani Kühn, is one of the most devastating diseases in rice. Breeders have always faced challenges in acquiring reliable and absolute resistance to this disease in existing rice germplasm. In this context, 40 rice germplasm including eight...
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Published in | SpringerPlus Vol. 4; no. 1; p. 175 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
11.04.2015
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Sheath blight, caused by the pathogenic fungus
Rhizoctonia solani
Kühn, is one of the most devastating diseases in rice. Breeders have always faced challenges in acquiring reliable and absolute resistance to this disease in existing rice germplasm. In this context, 40 rice germplasm including eight wild, four landraces, twenty- six cultivated and two advanced breeding lines were screened utilizing the colonized bits of typha. Except Tetep and ARC10531 which expressed moderate level of resistance to the disease, none could be found to be authentically resistant. In order to map the quantitative trait loci (QTLs) governing the sheath blight resistance, two mapping populations (F
2
and BC
1
F
2
) were developed from the cross BPT-5204/ARC10531. Utilizing composite interval mapping analysis, 9 QTLs mapped to five different chromosomes were identified with phenotypic variance ranging from 8.40 to 21.76%. Two SSR markers namely RM336 and RM205 were found to be closely associated with the major QTLs
qshb7.3
and
qshb9.2
respectively and were attested as well in BC
1
F
2
population by bulk segregant analysis approach. A hypothetical β 1–3 glucanase with other 31 candidate genes were identified in silico utilizing rice database RAP-DB within the identified QTL region
qshb9.2
. A detailed insight into these candidate genes will facilitate at molecular level the intricate nature of sheath blight, a step forward towards functional genomics. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2193-1801 2193-1801 |
DOI: | 10.1186/s40064-015-0954-2 |