Base-Editing-Mediated Artificial Evolution of OsALS1 In Planta to Develop Novel Herbicide-Tolerant Rice Germplasms  

作　　者：Yongjie Kuang Shaofang Li Bin Ren Fang Yan Carl Spetz Xiangju Li Xueping Zhou Huanbin Zhou 

机构地区：[1]State Key Laboratory for Biology of Plant Diseases and Insect Pests,Institute of Plant Protection,Chinese Academy of Agricultural Sciences,Beijing 100193,China [2]College of Biological Sciences,China Agricultural University,Beijing 100193,China [3]Scientific Observing and Experimental Station of Crop Pests in Guilin,Ministry of Agriculture and Rural Affairs,Guilin 541399,China [4]Norwegian Institute of Bioeconomy Research,1432 Aas,Norway [5]State Key Laboratory of Rice Biology,Institute of Biotechnology,Zhejiang University,Hangzhou 310058,China

出　　处：《Molecular Plant》2020年第4期565-572,共8页分子植物（英文版）

基　　金：This work was supported by grants from the National Natural Science Foundation of China(31871948);the Fundamental Research Funds,and the Agricultural Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences to H.Z.;a grant from the Fundamental Research Funds for the Central Universities to S.L.

摘　　要：Recently developed CRISPR-mediated base editors,which enable the generation of num erous nucleotide changes in target genomic regions,have been widely adopted for gene correction and generation of crop germ plasms containing im portant gain-of-function genetic variations.How ever,to engineer target genes with unknown functional SNPs remains challenging.To address this issue,we present here abase-e diting-mediated gene evolution(BEMGE)m ethod,employing both Cas9n-based cytosine and adenine base editors as well as a single-guide RNA(sgRNA)library tiling the full-length coding region,for developing novel rice germ plasm swith mutations in any endogenous gene.To this end,OsALS1 was artificially evolved in rice cells using BEMGE through both Agrobacterium-mediated and particle-bom bardment-mediated transform ation.Four different types of amino acid substitutions in the evolved OsALS1,derived from two sites that have never been targeted by natural or human selection during rice dom estication,were identified,conferring varying levels of tolerance to the herbicide bispyribac-sodium.Furtherm ore,the P171F substitution identified in a strong OsALS1 allele was quickly introduced into the commercial rice cultivar Nangeng 46 through precise base editing w ith the corresponding base editor and sgRNA.Collectively,these data indicate great potential of BEMGE in creating important genetic variants of target genes for crop improvement.

关 键 词：CRISPR base editor gene evolution OsALS1 herbicide resistance Otyza sativa L 

分 类 号：S511[农业科学—作物学]