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Leaf morphology in maize is regulated by developmental patterning along three axes: proximodistal,mediolateral,and adaxial-abaxial.Maize contains homologs of many genes identified as regulators of leaf development in other species,but their relation to the natural variation of leaf shape remains unknown.In this study,quantitative trait loci (QTL) for leaf angle,leaf orientation value,leaf length,and leaf width were mapped by a total of 256 F2∶3 families evaluated in three environments.Meta-analysis was used to integrate genetic maps and detect QTL across several independent QTL studies,on the basis of the previously reported experimental results for leaf architecture traits.Candidate gene sequences for leaf architecture were mapped in the integrated consensus genetic map.In total,21 QTL and 17 mQTL were detected.Among these QTL,qLA1-1 and qLA2 were consistently detected in 5 and 3 populations respectively,and six of 7 QTL with contributions (R2)over 10% were integrated in mQTL.Six key mQTL (mQTL1-1,mQTL2-1,mQTL3-3,mQTL5-1,mQTL7-2 and mQTL8-1) with R2 of some initial QTL over 10% included 4-6 initial QTL associated with 2-4 traits.Therefore,the chromosome regions for six mQTL with high QTL co-localization might be hot spots of the important QTL for the associated traits.Fifteen key candidate genes controlling leaf architecture traits coincided with eleven corresponding mQTL,including DWARF4,KAN3,ligulelessl,TAC1,ROT3,AS2/liguleless2,PFL2,yabby91SE/LIC/yabbyl 5,mwpl,CYCD3;2 and CYCB1.Especially,DWARF4,liguleless1,AS2/liguleless2,yabby9/SE/LIC/yabby 15 and CYCD 3;2 were mapped within such important mQTL1-1,mQTL2-1,mQTL3-3,mQTL5-1 and mQTL7-2 interval,respectively.Fine mapping or construction of single chromosome segment lines for genetic regions of such five mQTL is worth further study and could be put into use in marker-assisted breeding.In conclusion,the results provide useful information for further research and help to reveal the molecular mechanisms with regard to leaf architecture traits.