QTL Mapping of Stem Rind Penetrometer Resistance and Related Traits in Maize
QTL mapping for the rind penetrometer resistance,length and diameter of the third internode in 310 recombination inbred lines derived from a cross between PB80(weak penetration resistance)and PHJ65(strong pene-tration resistance)under three environments were carried out by employed the next-generation sequencing technolo-gy for population genotyping.The results indicated that a total of 12 putative QTLs for rind penetrometer resistance were found,each explaining 0.09％-10.67％of the phenotypic variation.Among them,QTLqSRPR2-4 with the larg-est effect among the 12 QTLs was repeated detected in two environments,and was identified as main effect QTL.A total of 13 putative QTLs for stem length were detected,each accounting for 2.39％-8.17％of the phenotypic varia-tion.Seven QTLs for stem diameter were identified,explaining 2.61％-8.21％of the phenotypic variation.Mean-while,three candidate genes(AC194970.5_FG005,GRMZM2G028905,GRMZM5G823629)were screened from the genomic region of the main effect QTL qSRPR2-4.The three genes affect the cellulose content of stem cell wall.
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