华北农学报 ›› 2021, Vol. 36 ›› Issue (5): 50-58. doi: 10.7668/hbnxb.20192281

所属专题: 玉米

• 作物遗传育种·种质资源·生物技术 • 上一篇    下一篇

高低种植密度下玉米茎粗的QTL鉴定

易强1, 杨泽兵1, 谭家颖1, 侯宪斌2, 刘应红3, 柏光晓1, 黄玉碧4   

  1. 1. 贵州大学 农学院 玉米研究所, 贵州 贵阳 550025;
    2. 百色学院 农业与食品工程学院, 广西 百色 533000;
    3. 四川农业大学 玉米研究所, 四川 成都 611130;
    4. 四川农业大学 农学院, 四川 成都 611130
  • 收稿日期:2021-04-13 出版日期:2021-10-28
  • 通讯作者: 柏光晓(1962-),女,贵州贵阳人,教授,硕士生导师,主要从事玉米遗传育种研究;黄玉碧(1963-),男,四川南充人,教授,博士,博士生导师,主要从事玉米遗传育种研究。
  • 作者简介:易强(1990-),男,湖南浏阳人,讲师,博士,主要从事玉米遗传育种研究。
  • 基金资助:
    贵州大学引进人才科研基金项目(贵大人基合字(2020)1号);国家自然科学基金项目(32072071);贵州大学科研培育基金项目(贵大培育(2020)71号)

QTL Identification for Stem Diameter under Low and High Planting Densities in Maize

YI Qiang1, YANG Zebing1, TAN Jiaying1, HOU Xianbin2, LIU Yinghong3, BAI Guangxiao1, HUANG Yubi4   

  1. 1. Maize Research Institute of College of Agriculture, Guizhou University, Guiyang 550025, China;
    2. College of Agriculture and Food Engineering, Baise University, Baise 533000, China;
    3. Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China;
    4. College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2021-04-13 Published:2021-10-28

摘要: 为挖掘不同种植密度下玉米茎粗的位点,改良西南地区玉米耐密性和抗倒伏能力。利用301份来源于玉米骨干亲本掖478和R08的重组自交系(RIL)群体在低种植密度(57 000株/hm2)、高种植密度(114 000株/hm2)条件和2014,2015年云南省景洪鉴定茎粗,并采用完备区间作图法的QTL ICIMapping V4.1和基于混合模型复合区间作图法的QTLNetwork 2.0分别进行数量性状位点(QTL)定位和QTL与环境互作分析。结果表明,双亲茎粗差异比较显示,掖478茎粗对密度变化不敏感,而R08茎粗随着密度增加显著变小。本研究的RIL群体茎粗变异广泛,同时随着密度增加,表型变异范围下降。高密度和低密度下RIL群体的茎粗遗传力分别为48.01%,65.03%。相关分析显示,茎粗在2种密度下与株高、穗位高和单穗穗质量极显著相关(0.29> r ≥0.13,P <0.01),与秃尖长和空秆率则不显著。联合环境作图检测到7个表型变异解释率为3.68%~6.91%的茎粗QTL,其中,4个QTL qSD1-1qSD3-1qSD4qSD6在高密度被观测到,仅qSD6在高低2种密度下被检测到。qSD1-1qSD3-1qSD3-2qSD4均未见前人茎粗定位的报道同时仅在高密度下检测到1对上位性位点。这些结果显示,高低密度下玉米茎粗的遗传调节不同。qSD6在2种密度条件和之前报道的相同来源的F2:3群体中均被检测到。上述QTL区段均在掖478相关系衍生和传递较好,可用于分子标记辅助育种改良玉米茎粗。

关键词: 玉米, 茎粗, 数量性状位点, 耐密性

Abstract: Mining the loci for stem diameter(SD) under different planting densities in maize could improve maize high-density tolerance and lodging resistance. SD was measured from 301 recombinant inbred lines(RIL) derived from the cross between the maize foundation parents Ye 478 and R08 under low(57 000 plants/ha) and high(114 000 plants/ha) planting densities in Jinghong, Yunnan Province, in 2014 and 2015. Quantitative trait loci(QTL) analyses were conducted by using inclusive composite interval mapping in QTL ICIMapping V4.1. QTL and environment interaction was analyzed by using the mixed-model-based composite interval mapping(MCIM) of QTLNetwork 2.0.The results showed that the difference of parental lines indicated Ye 478 did not differ for SD between two densities, but SD in R08 significantly decreased as the plant density increased. Considerable SD variation was observed in the RIL population. The range of phenotypic variation was decreased as the plant density increased. Heritability for SD in the RIL population under high and low planting densities were 48.01%, 65.03%, respectively. Correlation analyses revealed that SD was significantly correlated with plant height, ear height, and ear weight per plant(0.29> r ≥ 0.13, P <0.01), but had no significant correlation relationship with ear tip-barrenness and barrenness rate across both densities. QTL mapping by using joint analyses across both environments detected seven minor QTL for SD, with a range from 3.68% to 6.91%, and four QTL were observed under high density, namely qSD1-1, qSD3-1, qSD4, and qSD6. Only qSD6 was found across both planting densities. None of the four QTL(qSD1-1, qSD3-1, qSD3-2, and qSD4) was presented in the previous studies regarding QTL mapping for SD. Only one pair of loci for additive and additive interaction was found under high planting density. These results suggested different genetic regulations for SD across low and high densities. Among these QTL, qSD6 was simultaneously found across both densities and in the F2:3 population from the same cross reported in the previous study. Moreover, the QTL segments stated above are well descended and transmitted from Ye 478 and its descendants, which could be used for marker-assistance selection(MAS) in maize breeding.

Key words: Maize, Stem diameter, Quantitative trait loci, High-density tolerance

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引用本文

易强, 杨泽兵, 谭家颖, 侯宪斌, 刘应红, 柏光晓, 黄玉碧. 高低种植密度下玉米茎粗的QTL鉴定[J]. 华北农学报, 2021, 36(5): 50-58. doi: 10.7668/hbnxb.20192281.

YI Qiang, YANG Zebing, TAN Jiaying, HOU Xianbin, LIU Yinghong, BAI Guangxiao, HUANG Yubi. QTL Identification for Stem Diameter under Low and High Planting Densities in Maize[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(5): 50-58. doi: 10.7668/hbnxb.20192281.

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