文献类型： 外文期刊
作者： Wang, Lun 1 ; Huang, Yue 1 ; Liu, ZiAng 1 ; He, Jiaxian 1 ; Jiang, Xiaolin 1 ; He, Fa 1 ; Lu, Zhihao 1 ; Yang, Shuizhi 3 ; C 1 ;
作者机构： 1.Huazhong Agr Univ, Key Lab Hort Plant Biol, Minist Educ, Wuhan, Peoples R China
2.Hubei Hongshan Lab, Wuhan, Peoples R China
3.Hunan Acad Agr Sci, Hort Inst, Changsha, Peoples R China
4.Southwest Univ, Citrus Res Inst, Chongqing, Peoples R China
5.Univ Illinois, Dept Plant Biol, Urbana, IL USA
6.ARS, USDA, Ithaca, NY USA
7.Cornell Univ, Inst Genom Divers, Ithaca, NY USA
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： 2021 年 7 卷 7 期
页码：
收录情况： SCI
摘要： An improved reference genome of sweet orange and newly sequenced genomes of its somatic mutants uncover the global pattern of somatic variations, the diversification and dispersal history of sweet orange and candidate genes controlling fruit taste and flavour. Somatic variations are a major source of genetic diversification in asexual plants, and underpin clonal evolution and the breeding of asexual crops. Sweet orange is a model species for studying somatic variation because it reproduces asexually through apomixis and is propagated asexually through grafting. To dissect the genomic basis of somatic variation, we de novo assembled a reference genome of sweet orange with an average of three gaps per chromosome and a N50 contig of 24.2 Mb, as well as six diploid genomes of somatic mutants of sweet oranges. We then sequenced 114 somatic mutants with an average genome coverage of 41x. Categorization of the somatic variations yielded insights into the single-nucleotide somatic mutations, structural variations and transposable element (TE) transpositions. We detected 877 TE insertions, and found TE insertions in the transporter or its regulatory genes associated with variation in fruit acidity. Comparative genomic analysis of sweet oranges from three diversity centres supported a dispersal from South China to the Mediterranean region and to the Americas. This study provides a global view on the somatic variations, the diversification and dispersal history of sweet orange and a set of candidate genes that will be useful for improving fruit taste and flavour.
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