Academician Deng Xiuxin’s team reveals the conservation strategies of citrus wild relatives based on population genetics

Recently, the team of Academician Deng Xiuxin of the National Key Laboratory of Germplasm Innovation and Utilization of Horticultural Crops and the team of Zhou Yongfeng of Shenzhen Institute of Agricultural Genomics, Chinese Academy of Agricultural Sciences published an article entitled “Genomic conservation of crop wild relatives: a case study of
citrus” research paper. Taking wild capers as an example, the study uses population genetics and other research methods to study the genetic resources of wild citrus, and puts forward new insights on the protection of citrus genetic resources. new ideas.

Conservation of crop wild relatives needs to focus on genetic traits that are influenced by environmental factors, such as low genetic diversity, inbreeding, and small effective populations. Agricultural production highly destroys the habitats of wild relatives of crops, and the habitats of cultivated varieties and wild species overlap, resulting in the flow of genes from cultivated species to wild species, causing “pollution” to the “gene pool” of wild species, making crops wild and close to each other. Relative species have higher genetic load. In addition, since crop wild relatives have different reproductive model systems, different measures should be adopted for the protection of genetic resources.

Based on the above background, the team used the whole genome sequencing data of cultivated species and wild relatives of Kumquat, combined with geographical ecological data and reproductive phenotype data to conduct forward simulation analysis, and found obvious population fragmentation in wild populations, and Genetic traits of rapidly decreasing effective population size and high inbreeding. Further research revealed that wild species and cultivated species have highly overlapping ecological niches, which led to a continuous flow of gene flow from cultivated species to wild species. Based on the genome load research at the population level, the team found that there are many harmful mutation sites in cultivated populations, and gene introgression increases the genome load of wild populations, further increasing the risk of extinction in wild populations; in populations with different reproductive modes, apomixis Traits such as self-incompatibility and self-incompatibility have an impact on effective population, gene flow and genetic load. Finally, based on the research of population genetics and the long-term conservation practice of wild germplasm resources, the team put forward specific suggestions and methods for the conservation of wild citrus populations.

Citrus subfamilies phylogeny, different reproductive types and geographical distribution predictions of cultivated kumquats and related wild kumquats

It is reported that Wang Nan, Ph.D. of Huazhong Agricultural University and postdoctoral fellow of Shenzhen Institute of Agricultural Genomics, Chinese Academy of Agricultural Sciences, is the first author of the paper. Deng Xiuxin, academician of Huazhong Agricultural University, and Zhou Yongfeng, researcher of Shenzhen Institute of Agricultural Genomics, Chinese Academy of Agricultural Sciences, are the co-corresponding authors of the paper. University of Minnesota Peter L.
Professor Morrell, postdoctoral fellows Liu Zhongjie, Xiao Hua, Xu Xiaodong, Ma Zhiyao, and master student Cao Shuo of the research group of Professor Zhou Yongfeng participated in the research. Professor Guo Wenwu, Professor Xu Qiang, Professor Chai Lijun and Associate Researcher Ye Junli of the citrus team of our school provided important guidance for the development of this research. Dr. Hu Jianbing from the research group of Academician Deng Xiuxin of Huazhong Agricultural University, and Mr. Chen Peng from the Horticulture Institute of Hunan Academy of Agricultural Sciences provided important help for the materials and analysis of the study. The research was funded by the National Key R&D Program, Overseas Excellent Youth and other projects.

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