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QTL mapping and candidate gene analysis for yield and grain weight/size in Tartary buckwheat
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QTL mapping and candidate gene analysis for yield and grain weight/size in Tartary buckwheat
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Journal Article
QTL mapping and candidate gene analysis for yield and grain weight/size in Tartary buckwheat
2023
Overview
Background
Grain weight/size influences not only grain yield (GY) but also nutritional and appearance quality and consumer preference in Tartary buckwheat. The identification of quantitative trait loci (QTLs)/genes for grain weight/size is an important objective of Tartary buckwheat genetic research and breeding programs.
Results
Herein, we mapped the QTLs for GY, 1000-grain weight (TGW), grain length (GL), grain width (GW) and grain length–width ratio (L/W) in four environments using 221 recombinant inbred lines (XJ-RILs) derived from a cross of 'Xiaomiqiao × Jinqiaomai 2'. In total, 32 QTLs, including 7 for GY, 5 for TGW, 6 for GL, 11 for GW and 3 for L/W, were detected and distributed in 24 genomic regions. Two QTL clusters,
qClu-1-3
and
qClu-1-5
, located on chromosome Ft1, were revealed to harbour 7 stable major QTLs for GY (
qGY1.2
), TGW (
qTGW1.2
), GL (
qGL1.1
and
qGL1.4
), GW (
qGW1.7
and
qGW1.10
) and L/W (
qL/W1.2
) repeatedly detected in three and above environments. A total of 59 homologues of 27 known plant grain weight/size genes were found within the physical intervals of
qClu-1-3
and
qClu-1-5
. Six homologues,
FtBRI1
,
FtAGB1
,
FtTGW6
,
FtMADS1
,
FtMKK4
and
FtANT
, were identified with both non-synonymous SNP/InDel variations and significantly differential expression levels between the two parents, which may play important roles in Tatary buckwheat grain weight/size control and were chosen as core candidate genes for further investigation.
Conclusions
Two stable major QTL clusters related to grain weight/size and six potential key candidate genes were identified by homology comparison, SNP/InDel variations and qRT‒qPCR analysis between the two parents. Our research provides valuable information for improving grain weight/size and yield in Tartary buckwheat breeding.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
