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Genome of Wild Mandarin and Domestication History of Mandarin

文献类型： 外文期刊

作者： Wang, Lun 1 ; He, Fa 1 ; Huang, Yue 1 ; He, Jiaxian 1 ; Yang, Shuizhi 2 ; Zeng, Jiwu 3 ; Deng, Chongling 4 ; Jiang, Xiaol 1 ;

作者机构： 1.Huazhong Agr Univ, Minist Educ, Key Lab Hort Plant Biol, Wuhan 430070, Hubei, Peoples R China

2.Hunan Acad Agr Sci, Hort Inst, Changsha 410125, Hunan, Peoples R China

3.Guangdong Acad Agr Sci, Fruit Tree Res Inst, Guangzhou 510640, Guangdong, Peoples R China

4.Guangxi Acad Specialty Crops, Guangxi Key Lab Citrus Biol, Guilin 541000, Peoples R China

5.Inst Citrus Sci Res Ganzhou City, Ganzhou 341000, Peoples R China

关键词： Citrus; Citric acid; Domestication; Genome; Wild mandarin

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

ISSN： 1674-2052

年卷期： 2018 年 11 卷 8 期

页码：

收录情况： SCI

摘要： Mandarin (Citrus reticulata) is one of the most important citrus crops worldwide. Its domestication is believed to have occurred in South China, which has been one of the centers of mandarin cultivation for four millennia. We collected natural wild populations of mandarin around the Nanling region and cultivated landraces in the vicinity. We found that the citric acid level was dramatically reduced in cultivated mandarins. To understand genetic basis of mandarin domestication, we de novo assembled a draft genome of wild mandarin and analyzed a set of 104 citrus genomes. We found that the Mangshan mandarin is a primitive type and that two independent domestication events have occurred, resulting in two groups of cultivated mandarins (MD1 and MD2) in the North and South Nanling Mountains, respectively. Two bottlenecks and two expansions of effective population size were identified for the MD1 group of cultivated mandarins. However, in the MD2 group there was a long and continuous decrease in the population size. MD1 and MD2 mandarins showed different patterns of interspecific introgression from cultivated pummelo species. We identified a region of high divergence in an aconitate hydratase (ACO) gene involved in the regulation of citrate content, which was possibly under selection during the domestication of mandarin. This study provides concrete genetic evidence for the geographical origin of extant wild mandarin populations and sheds light on the domestication and evolutionary history of mandarin.

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