中国农业科学 ›› 2017, Vol. 50 ›› Issue (18): 3450-3460.doi: 10.3864/j.issn.0578-1752.2017.18.002

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

不同氮磷钾处理大豆苗期主根长和侧根数的QTL定位分析

梁慧珍1,董薇1,许兰杰1,余永亮1,杨红旗1,谭政伟1,许阳2,陈鑫伟3

 
  

  1. 1河南省农业科学院芝麻研究中心,郑州 450002;2南阳市农业科学院,河南南阳 473083;3商丘市农林科学院,河南商丘 476000
  • 收稿日期:2017-03-06 出版日期:2017-09-16 发布日期:2017-09-16
  • 作者简介:梁慧珍,Tel:0371-65751589;E-mail:lhzh66666@163.com
  • 基金资助:
    河南省农业科技攻关计划(152102110140,172102110088)、农业科研杰出人才及其创新团队项目、河南省农业科学院科研发展专项(201513110)

QTL Mapping for Main Root Length and Lateral Root Number in Soybean at the Seedling Stage in Different N, P and K Environments

LIANG HuiZhen1, DONG Wei1, XU LanJie1, YU YongLiang1, YANG HongQi1, TAN ZhengWei1, XU Yang2, CHEN XinWei3   

  1. 1Sesame Research Center, Henan Academy of Agricultural Sciences, Zhengzhou 450002; 2 3Shangqiu Academy of Agriculture and Forestry Sciences, Shangqiu 476000, HenanNanyang Academy of Agricultural Sciences, Nanyang 473083, Henan;
  • Received:2017-03-06 Online:2017-09-16 Published:2017-09-16

摘要: 【目的】主根长和侧根数是重要的根系性状。通过不同氮磷钾处理,发掘大豆苗期主根长和侧根数的基因资源、了解其遗传机制,定位其主效QTL,分析QTL间的上位性和环境互作效应,对生产提供理论指导。【方法】以栽培大豆晋豆23为母本、山西农家品种灰布支黑豆(ZDD02315)为父本所衍生的447个RIL作为供试群体,取亲本及447个家系各30粒种子,用灭菌纸包裹后,2015年和2016年分别放置于CK(模拟种植不施肥)、NPK(模拟大田正常配施氮磷钾肥)和1.5NPK(模拟高肥田块)3种生长环境下进行水培试验,每组试验设置3次重复,环境温度20—28℃,幼苗长到V2期,对幼苗期相关根部性状数据进行测量。分别采用WinQTLCart 2.5和QTLNETwork 2.1 2种遗传模型检测QTL,分析QTL间的上位性和环境互作效应。【结果】基于复合区间作图(CIM)共检测到24个影响主根长和侧根数的QTL,分布于第2、3、5、6、7、8、9、10、11、12、13、14、16、17共14条染色体中,单个QTL的贡献率介于8.52%—43.62%,QTL主要表现为加性效应。基于混合线性模型(MCIM)检测到影响主根长和侧根数的QTL各1个,2个QTL均表现出加性效应和环境互作效应。另有2对主根长和2对侧根数均检测出加性×加性上位性互作QTL,主根长和侧根数各有1对表现出主效QTL与非主效QTL加性×加性上位性互作,各有1对表现出非主效QTL与非主效QTL加性×加性上位性互作,2对主根长互作QTL分别解释了1.53%和1.95%的表型变异率,2对侧根数互作QTL分别解释了2.47%和1.13%的表型变异率。2个QTL能在2种分析方法中同时检测到,9个QTL能在3种环境下同时检测到。第6染色体在2015年NPK、1.5NPK和2016年1.5NPK 3个环境下均检测到主根长QTL,第5染色体在2015年NPK和1.5NPK、2016年CK 3个环境下、第17染色体在2015年CK和NPK、2016年NPK 3个环境下均检测到侧根数QTL。【结论】苗期大豆主根长和侧根数对氮磷钾的吸收影响较少,生产中尽可能减少氮磷钾使用量。不同浓度氮磷钾处理苗期主根长和侧根数参数间既有共同的控制基因,也有各自独特的控制基因,多数QTL不能在多个环境下重复检测到,控制其表达的遗传机制较为复杂。加性效应、加性与环境互作和加性×加性上位性互作效应在主根长和侧根数的形成和遗传中发挥着重要作用。主根长和侧根数各有1个QTL能在2种分析方法中同时检测到,Satt442-Satt296和Satt521-GMABABR是共位标记区间。

关键词: 大豆, 氮磷钾, 主根长, 侧根数, QTL, 上位性互作

Abstract: 【Objective】Main root length (MRL) and lateral root number (LRN) are important root traits. It is important to develop the gene resources and reveal the genetic mechanisms of MRL and LRN, and identify quantitative trait loci (QTL) associated with root traits in soybean, including main-effect QTLs, epistatic effects and QTL × environment interactions, meanwhile, map the main-effect QTLs, epistatic effects and QTL × environment interactions in different N, P and K environments. 【Method】A total of 447 RILs derived from a cross between cultivated Jindou23 as the female and native variety HuibuzhiZDD02315 as the male were used as materials. Thirty seeds from each of the RILs and their parents were covered with pasteurized paper, and cultivated in CK (nonfertilized condition), NPK (normal fertilization conditions) and 1.5NPK (high fertilization conditions) at 20-28℃ in 2015 and 2016, and a complete random design with three replications was used in this study. Root traits were measured at V2 stage. Epistatic QTLs and QTL × environment interactions were performed using WinQTLCart 2.5 and QTLNETwork 2.1. 【Result】Twenty-four QTLs for MRL and LRN were detected on chromosomes 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16 and 17 using CIM method in this study. The variation accounted for by each of these twenty- four QTLs ranged from 8.52% to 43.62%. These QTLs showed additive effect. Two QTLs for MRL and LRN were detected by MCIM, which showed an additive effect. Another two pairs of additive × additive epistatic effects QTLs for MRL and LRN were detected, including one pair of major QTLs and non-major QTL additive × additive epistatic effects, and one pair of non-major QTLs and non-major QTL additive × additive epistatic effects. Two pairs of QTL interaction for MRL explained 1.53% and 1.95% of the phenotypic variation, and two pairs of QTL interaction for LRN explained 2.47% and 1.13% of the phenotypic variation. Two QTLs were simultaneously detected on the same chromosome using two WinQTLCart 2.5 and QTLNETwork 2.1. Nine QTLs were simultaneously detected in three environments. The QTL for MRL was all mapped on chromosome 6 in 2015 (including NPK and 1.5NPK) and 2016 (including 1.5NPK). The QTL for LRN was all detected on chromosome 5 in 2015 (including NPK and 1.5NPK) and 2016 (including CK), another QTL for LRN was all mapped on chromosome 17 in 2015 (including CK and NPK) and 2016 (including NPK). 【Conclusion】MRL and LRN absorb less NPK at seedling stage in soybean, so farmers should minimize the use of NPK in agricultural production. MRL and LRN were controlled by the same controlled gene and specific gene in NPK treatments. Some QTLs were not simultaneously identified in different NPK environments as the related genetic mechanism is comparatively complex. Additive effects, additive × environment interactions and additive × additive epistatic effects are important genetic factors in MRL and LRN formation and inheritance. One each QTL for MRL and LRN was all detected by CIM and MCIM; one stable gene for MRL and LRN existed in interval markers between Satt442-Satt296 and Satt521-GMABABR.

Key words: soybean, nitrogen, phosphorus and potassium, main root length, lateral root number, quantitative trait loci, epistatic effects