文献类型： 外文期刊
作者： Hu, Jianbing 1 ; Liu, Chenchen 1 ; Du, Zezhen 1 ; Guo, Furong 1 ; Song, Dan 1 ; Wang, Nan 1 ; Wei, Zhuangmin 3 ; Jiang, Jingdong 1 ; Cao, Zonghong 1 ; Shi, Chunmei 1 ; Zhang, Siqi 1 ; Zhu, Chenqiao 1 ; Chen, Peng 4 ; Larkin, Robert 1 ; Lin, Zongcheng 1 ; Xu, Qiang 1 ; Ye, Junli 1 ; Deng, Xiuxin 1 ; Bosch, Maurice 5 ; Franklin-Tong, Vernonica 6 ; Chai, Lijun 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Hort & Forestry Sci, Natl Key Lab Germplasm Innovat & Utilizat Hort Cro, Wuhan, Peoples R China
2.Hubei Hongshan Lab, Wuhan, Peoples R China
3.Guangxi Subtrop Crops Res Inst, Nanning, Peoples R China
4.Hunan Acad Agr Sci, Hort Inst, Changsha, Peoples R China
5.Aberystwyth Univ, Inst Biol Environm & Rural Sci IBERS, Aberystwyth, Wales
6.Univ Birmingham, Coll Life & Environm Sci, Sch Biosci, Birmingham, England
关键词： Self-incompatibility; citrus; S-RNase; S-locus; MITE; evolution
期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.8； 五年影响因子：13.2 ）
ISSN： 1467-7644
年卷期： 2023 年
页码：
收录情况： SCI
摘要： Self-incompatibility (SI) is a widespread prezygotic mechanism for flowering plants to avoid inbreeding depression and promote genetic diversity. Citrus has an S-RNase-based SI system, which was frequently lost during evolution. We previously identified a single nucleotide mutation in S-m-RNase, which is responsible for the loss of SI in mandarin and its hybrids. However, little is known about other mechanisms responsible for conversion of SI to self-compatibility (SC) and we identify a completely different mechanism widely utilized by citrus. Here, we found a 786-bp miniature inverted-repeat transposable element (MITE) insertion in the promoter region of the FhiS(2)-RNase in Fortunella hindsii Swingle (a model plant for citrus gene function), which does not contain the S-m-RNase allele but are still SC. We demonstrate that this MITE plays a pivotal role in the loss of SI in citrus, providing evidence that this MITE insertion prevents expression of the S-RNase; moreover, transgenic experiments show that deletion of this 786-bp MITE insertion recovers the expression of FhiS(2)-RNase and restores SI. This study identifies the first evidence for a role for MITEs at the S-locus affecting the SI phenotype. A family-wide survey of the S-locus revealed that MITE insertions occur frequently adjacent to S-RNase alleles in different citrus genera, but only certain MITEs appear to be responsible for the loss of SI. Our study provides evidence that insertion of MITEs into a promoter region can alter a breeding strategy and suggests that this phenomenon may be broadly responsible for SC in species with the S-RNase system.
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