An efficient TILLING platform for cultivated tobacco

文献类型： 外文期刊

第一作者： Gao, Yu-Long

作者： Gao, Yu-Long;Li, Wen-Zheng;Song, Zhong-Bang;Wang, Bing-Wu;Wu, Yu-Ping;Shi, Jun-Li;Li, Yong-Ping;Yao, Xue-Feng;Liu, Chun-Ming;Yao, Xue-Feng;Liu, Guan-Shan;Liu, Chun-Ming

作者机构：

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

ISSN： 1672-9072

年卷期： 2020 年 62 卷 2 期

页码：

收录情况： SCI

摘要： Targeting-induced local lesions in genomes (TILLING) is a powerful reverse-genetics tool that enables high-throughput screening of genomic variations in plants. Although TILLING has been developed for many diploid plants, the technology has been used in very few polyploid species due to their genomic complexity. Here, we established an efficient capillary electrophoresis-based TILLING platform for allotetraploid cultivated tobacco (Nicotiana tabacum L.) using an ethyl methanesulfonate (EMS)-mutagenized population of 1,536 individuals. We optimized the procedures for endonuclease preparation, leaf tissue sampling, DNA extraction, normalization, pooling, PCR amplification, heteroduplex formation, and capillary electrophoresis. In a test screen using seven target genes with eight PCR fragments, we obtained 118 mutants. The mutation density was estimated to be approximately one mutation per 106kb on average. Phenotypic analyses showed that mutations in two heavy metal transporter genes, HMA2S and HMA4T, led to reduced accumulation of cadmium and zinc, which was confirmed independently using CRISPR/Cas9 to generate knockout mutants. Our results demonstrate that this powerful TILLING platform (available at ) can be used in tobacco to facilitate functional genomics applications.

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