Journal of Integrative Agriculture ›› 2024, Vol. 23 ›› Issue (8): 2589-2604.DOI: 10.1016/j.jia.2023.11.012

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芝麻SiHEC3基因上游从5’UTR起的1049 bp序列缺失引起种子不落粒的突变

  

  • 收稿日期:2023-08-23 接受日期:2023-10-08 出版日期:2024-08-20 发布日期:2024-07-29

Deletion of a 1,049 bp sequence from the 5´ UTR upstream of the SiHEC3 gene induces a seed non-shattering mutation in sesame  

Ming Ju1, 2, 3, Guiting Li1, 2, 3, Qiuzhen Tian1, 2, 3, Hengchun Cao1, 2, 3, Qin Ma1, 2, 3, Yinghui Duan1, 2, 3, Hui Guo1, 2, 3, Zhanyou Zhang1, 2, 3, Yingying Huang1, 2, 3, Huili Wang1, 2, 3Haiyang Zhang1, 2, 3#, Hongmei Miao1, 2, 3#   

  1. 1 The Shennong Laboratory, Zhengzhou 450002, China
    2 Henan Sesame Research Center, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China
    3 Key Laboratory of Specific Oilseed Crops Genomics of Henan Province, Henan Sesame Research Center, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China
  • Received:2023-08-23 Accepted:2023-10-08 Online:2024-08-20 Published:2024-07-29
  • About author:Ming Ju, Tel/Fax: +86-371-65720774, E-mail: jumingzz@163.com; #Correspondance Hongmei Miao, Tel/Fax: +86-371-65720774, E-mail: miaohongmeichina@163.com; Haiyang Zhang, Tel/Fax: +86-371-65720774, E-mail: zhanghaiyang@zzu.edu.cn
  • Supported by:
    This work was financially supported by the earmarked funding for the China Agriculture Research System of MOF and MARA (CARS-14), the Key Project of Science and Technology of Henan Province, China (201300110600), the Henan Province Specific Professor Position Program, China (SPPP2022), the Zhongyuan Scientist Workshop Construction, China (ZSWC2019 and 214400510026), the Innovation Scientist and Technician Troop Construction Project of Henan Province, China (ISTTCPHP2016), the Shennong Laboratory First Class Program, China (SN01-2022-04), the Key Research and Development Project of Henan Province, China (221111520400), the Innovation Scientists and Technicians Troop Construction Project of Henan Academy of Agricultural Sciences, China (2023TD04), and the Henan Province Science and Technology Research and Development Plan Joint Fund, China (232301420108).

摘要:

芝麻由于落粒性是一种机械化程度较低的劳动密集型作物。本研究以抗落粒芝麻突变体12M07为材料开展了抗落粒性状的遗传解析。落粒型不同,12M07突变体脱落区的薄壁细胞排列松散,但紧贴在种皮上。对12M07 (抗落粒型) ×项城大籽(落粒型) 六世代的遗传分析表明,抗落粒性状为隐性性状,受单基因对控制。上述亲本的F2群体的888,619个变(snpInDels)31,884个结构变异(SV)的关联分析结果显示只有SV12002位点与抗落粒性状显著相关,此结构变异位于SiChr3中的Sindi0765000基因 (命名为SiHEC3)上游5'UTR区域SiHEC3编码HLH转录因子12M07突变体中Sihec3基因从5 ' UTR开始至上游启动子出现1049 bp的缺失。SiHEC3基因主要在发育中的胎座组织中表达,并且在授粉后45 d达到表达高峰。在烟草中进行的双荧光素酶报告基因实验证实,Sihec3的启动子活性由于缺失1049bp的启动子序列而降低。蛋白-蛋白互作网络分析表明,HEC39个关键蛋白共表达,比如参与植物脱落层次生壁生物合成的SHATTERPROOF1 (SHP1)SEEDSTICK (STK)。研究结果显示SiHEC3基因落粒性状相对应的重要功能,为芝麻等作物宜机收新品种选育提供了基因信息。

Abstract:

Sesame is a labor intensive crop with limited mechanized harvesting mainly due to the seed shattering (SS) trait.  In this study, we performed a genetic analysis of the seed-shattering resistance (SR) trait with a SR sesame mutant 12M07.  Unlike the SS type, the parenchyma cells in the abscission zone of the 12M07 mutant are arranged loosely but adhere to the seed coat.  Inheritance analysis of six generations derived from 12M07 (SR)×Xiangcheng Dazibai (SS) showed that the SR trait is recessive and controlled by a single gene pair.  Association mapping of the F2 population with 888,619 variants (single-nucleotide polymorphisms (SNPs) and insertion-deletion (InDels)) and 31,884 structural variations (SVs) determined that only SV12002 in the 5´ upstream region of gene Sindi0765000 (named SiHEC3) in Chr.3 was significantly associated with the SR trait.  SiHEC3 encodes the bHLH transcription factor.  A 1,049 bp deletion occurred in the 5´ UTR of Sihec3 in 12M07.  SiHEC3 is mainly expressed in developing placental tissues, with the expression peaking in capsules at 45 days after pollination.  A dual-luciferase reporter assay in tobacco confirmed that the promoter activity of Sihec3 was reduced because of the deletion of the 1,049 bp promoter sequence.  Protein–protein interaction network analysis showed that HEC3 is co-expressed with nine key proteins, such as SHATTERPROOF1 (SHP1) and SEEDSTICK (STK) which participate in the secondary wall biosynthesis of the abscission layer in plants.  The findings of this study show the important function of Sihec3 corresponding with the SR trait and supply the genetic information for breeding new varieties that are amenable to mechanized harvesting in sesame and other crops.


Key words: sesame (Sesamum indicum L.) , association mapping ,  seed shattering ,  structure variation ,  bHLH transcription factor