基于小麦55K SNP芯片检测小麦穗长和株高性状QTL  

Detection of QTLs for Spike Length and Plant Height in Wheat Based on 55K SNP Array

作　　者：李聪 马建[1] 刘航 丁浦洋 杨聪聪[1] 张涵[1] 秦娜娜[1] 兰秀锦[1] LI Cong;MA Jian;LIU Hang;DING Puyang;YANG Congcong;ZHANG Han;QIN Nana;LAN Xiujin(Triticeae Research Institute,Sichuan Agricultural University,Chengdu,Sichuan 611130,China)

机构地区：[1]四川农业大学小麦研究所

出　　处：《麦类作物学报》2019年第11期1284-1292,共9页Journal of Triticeae Crops

基　　金：四川省国际合作交流项目基金(2017HH0076)项目资助

摘　　要：为了进一步挖掘小麦穗长和株高的QTL位点,将小麦品系‘20828’和国审小麦品种川农16杂交后得到的重组自交系群体(RIL)于2016-2018年种植在四川崇州、温江和雅安以及孟加拉国库尔纳市,进行穗长和株高的遗传分析。结果表明,在RIL群体内,穗长和株高均呈正态分布,符合数量性状遗传特点。在3年8个环境中共检测出44个控制穗长和株高的QTL,其中稳定的穗长QTL有5个,分布于2D、4B和5B染色体上,贡献率为2.90%~26.26%;控制株高的稳定QTL有3个,分布于2D、4B和4D染色体上,贡献率为1.96%~21.22%。在2D染色体AX-86171316~AX-109422526标记区间和4B染色体AX-109526283~AX-110549715标记区间均同时检测到了控制穗长和株高的QTL,推测为一因多效位点。QSl.sau.2D.1、QSl.sau.2D.2、QSl.sau.4B.1、QSl.sau.4B.2、QSl.sau.5B、QPh.sau.2D和QPh.sau.4B可能为新的稳定QTL。本研究鉴定的这些位点对增加穗长、降低株高以及提高小麦的产量具有重要作用。In order to further excavate QTLs for spike length and plant height of wheat,a recombinant inbred line(RIL)population obtained from the cross between a wheat line‘20828’and a national authorized wheat variety‘Chuannong 16’was planted and evaluated in Wenjiang,Chongzhou,and Ya’an of Sichuan from 2016to 2018and Khulna Bgladesh in 2018.The spike length and plant height showed continuous variation with approximately normal distributions,indicating that they are suitable for QTL analysis.A total of 44QTLs were detected in the eight environments.Five stable QTLs associated with spike length were detected on chromosomes 2D,4Band 5B,explaining 2.90%to 26.26%of phenotypic variations.Three stable QTLs associated with plant height were detected on chromosomes 4B,4Dand 2D,explaining 1.96%to 21.22%of phenotypic variations.The loci located in the interval of AX-86171316-AX-109422526on chromosome 2Dand AX-109526283-AX-110549715on chromosome 4Bcontrolled both spike length and plant height and may be a pleiotropic QTL.Furthermore,QSl.sau.2D.1,QSI.sau.2D.2,QSl.sau.4B.1,QSl.sau.4B.2,QSl.sau.5B,QPh.sau.2D,QPh.sau.4Band may be novel stable QTLs.These detected loci will be useful for increasing spike length,decreasing plant height and boosting grain yield.

关 键 词：普通小麦 穗长 株高 QTL 小麦55KSNP芯片 

分 类 号：S512.1[农业科学—作物学] S330