QTL associated with Gummy Stem Blight (GSB) resistance in watermelon
Abstract Background Gummy stem blight (GSB), caused by Didymella bryoniae (syn. Stagonosporopsis cucurbitacearum ), produces devastating symptoms on whole plants of watermelon ( Citrullus lanatus ) and other cucurbits, significantly reducing yield and quality. Identification of genetic determinants...
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Published in | BMC genomics Vol. 23; no. 1; pp. 1 - 632 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
London
BioMed Central Ltd
03.09.2022
BioMed Central BMC |
Subjects | |
Online Access | Get full text |
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Summary: | Abstract
Background
Gummy stem blight (GSB), caused by
Didymella bryoniae
(syn.
Stagonosporopsis cucurbitacearum
), produces devastating symptoms on whole plants of watermelon (
Citrullus lanatus
) and other cucurbits, significantly reducing yield and quality. Identification of genetic determinants and sources of resistance to this devastating GSB disease in watermelon is essential for developing resistant varieties.
Results
In this study, we aimed at identifying quantitative trait loci (QTLs) linked to GSB resistance in melon. We identified the genome-wide single nucleotide polymorphisms (SNPs) by genotyping by sequencing (GBS) of an F
2
population developed from
C. lanatus
lines, ‘PI 279461’ (
resistant
) ✕ ‘PI 223764’ (susceptible). Inheritance analysis indicated that resistance to GSB is a multi-genic trait in this population. Three QTLs namely,
ClGSB1.1
,
ClGSB10.1
, and
ClGSB11.1
associated with GSB resistance, explaining approximately 10% of the phenotypic variation, were identified. Among these, the QTL
ClGSB1.1
on chromosome 1 is identified as a major QTL harboring five candidate genes associated with GSB resistance including two RLKs (
ClC01G014900
and
ClC01G015010
), two WRKY transcription factors (
ClC01G014910
and
ClC01G014990
), and one AvrRpt-cleavage domain protein (
ClC01G015130
).
Conclusion
Two high resolution melting (HRM) markers,
WmGSB1.1–2
and
WmGSB1.1–7
having a high positive correlation with the phenotypic variations, were developed. Five potential candidate genes were predicted to be associated with GSB resistance. These findings will help breeders to develop watermelon cultivars resistant to GSB. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1471-2164 1471-2164 |
DOI: | 10.1186/s12864-022-08849-2 |