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Evolution of self-compatibility by a mutant S-m-RNase in citrus

文献类型： 外文期刊

作者： Liang, Mei 1 ; Cao, Zonghong 1 ; Zhu, Andan 3 ; Liu, Yuanlong 4 ; Tao, Mengqin 1 ; Yang, Huayan 1 ; Xu, Qiang, Jr. 1 ; Wa 1 ;

作者机构： 1.Huazhong Agr Univ, Key Lab Hort Plant Biol, Minist Educ, Wuhan, Peoples R China

2.Univ Connecticut, Dept Ecol & Evolutionary Biol, Storrs, CT USA

3.Chinese Acad Sci, Kunming Inst Bot, Germplasm Bank Wild Species, Kunming, Yunnan, Peoples R China

4.South China Agr Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou, Peoples R China

5.Yunnan Acad Agr Sci, Inst Trop & Subtrop Cash Crops, Kunming, Yunnan, Peoples R China

6.Guangxi Acad Specialty Crops, Guangxi Key Lab Citrus Biol, Guilin, Peoples R China

7.Aberystwyth Univ, Inst Biol Environm & Rural Sci IBERS, Aberystwyth, Dyfed, Wales

8.Univ Birmingham, Sch Biosci, Coll Life & Environm Sci, Birmingham, W Midlands, England

期刊名称：NATURE PLANTS （ 影响因子：15.793； 五年影响因子：17.349 ）

ISSN： 2055-026X

年卷期： 2020 年 6 卷 2 期

页码：

收录情况： SCI

摘要： Self-incompatibility (SI) is an important mechanism that prevents self-fertilization and inbreeding in flowering plants. The most widespread SI system utilizes S ribonucleases (S-RNases) and S-locus F-boxes (SLFs) as S determinants. In citrus, SI is ancestral, and Citrus maxima (pummelo) is self-incompatible, while Citrus reticulata (mandarin) and its hybrids are self-compatible (SC). Here, we identify nine highly polymorphic pistil-specific, developmentally expressed S-RNases from pummelo that segregate with S haplotypes in a gametophytic manner and cluster with authentic S-RNases. We provide evidence that these S-RNases function as the female S determinants in citrus. Moreover, we show that each S-RNase is linked to approximately nine SLFs. In an analysis of 117 citrus SLF and SFL-like (SLFL) genes, we reveal that they cluster into 12 types and that the S-RNases and intra-haplotypic SLF and SLFL genes co-evolved. Our data support the notion that citrus have a S locus comprising a S-RNase and several SLFs that fit the non-self-recognition model. We identify a predominant single nucleotide mutation, S-m-RNase, in SC citrus, which provides a 'natural' loss of function. We show that SI-SC transitions due to the S-m-RNase initially arose in mandarin, spreading to its hybrids and became fixed. Identification of an evolutionarily distant new genus utilizing the S-RNase-based SI system, >100 million years separated from the nearest S-RNase family, is a milestone for evolutionary comparative studies.

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