A rare natural variation in TaFT-D2 underlies QTss.cas-3D associated with increased total spikelet number per spike in wheat  

作　　者：Hong Liu Zhipeng Shi Guohao Han Jinpeng Zhang Tiantian Gu Jing Wang Hanwen Yan Lixian Xing Lihui Li Diaoguo An 

机构地区：[1]Center for Agricultural Resources Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Shijiazhuang 050021,Hebei,China [2]Institute of Crop Science,Chinese Academy of Agricultural Sciences,Beijing 100081,China [3]Yazhouwan National Laboratory,Sanya 572024,Hainan,China

出　　处：《The Crop Journal》2024年第6期1727-1734,共8页作物学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (32101686);the Hebei Province Key Research and Development Program (22326306D).

摘　　要：Total spikelet number per spike(TSS)is a crucial yield component in wheat.Dissecting and characterizing major stable quantitative trait loci(QTL)associated with TSS can significantly enhance the genetic improvement of yield potential.In a previous study,we identified a stable major QTL for TSS,named QTss.cas-3D.In the present study,we conducted fine mapping of QTss.cas-3D,interval to approximately 6.35 Mb,ranging from 105.03 to 111.38 Mb,based on the IWGSC RefSeq v2.1.Through genome resequencing and gene function annotation,we identified TraesCS3D03G0308000(TaFT-D2)as the candidate gene.Phenotypic evaluation with paired near-isogenic lines revealed that this locus predominantly increases kernel number per spike by enhancing TSS and fertile spikelet number per spike,without significantly affecting thousand-kernel weight or tiller number.The presence of the TaFT-D2 allele in the parent P3228,which is rare in nature populations,highlights its potential value.This study provides a valuable gene resource and functional marker for wheat molecular breeding aimed at improving TSS and establishes a foundation for gene functional analysis of TaFT-D2.

关 键 词：WHEAT Total spikelet number per spike Fine mapping TaFT-D2 

分 类 号：S512.1[农业科学—作物学]