Generation of ospin9 Mutants in Rice by CRISPR/Cas9 Genome Editing Technology
WU ShiYang,, YANG XiaoYi, ZHANG YanWen, HOU DianYun, XU HuaWei,College of Agriculture, Henan University of Science and Technology, Luoyang 471000, Henan
Abstract 【Objective】Auxin efflux protein family PIN-FORMED (PIN) is a key protein family in controlling polar auxin transport (PAT). OsPIN9 is one of the monocot-specific PIN genes in rice, while its biological function still needs to be further elucidated. In this study, OsPIN9 was edited and ospin9 homozygous mutants were obtained using CRISPR/Cas9 genome editing technology. The resultant ospin9 mutant lines could provide a basis for further research on the function of OsPIN9.【Method】The specific target sequence was designed according to OsPIN9 genome sequence and OsPIN9 genome editing vector was constructed. Nippobare (Oryza sativa japonica) was used as the material and the hygromycin-resistant rice was obtained by Agrobacterium-mediated transformation. The positive transgenic lines were screened by PCR. The mutation sites were confirmed by the combination of PCR and subsequent analysis of sequencing results, the homozygous mutants were obtained and the difference of amino acid sequence and tertiary structure of OsPIN9 protein was analyzed between WT and ospin9 mutants. The expression of OsPINs genes in mutant roots was performed by quantitative real-time PCR (qRT-PCR), and the phenotype of ospin9 mutants was analyzed at the seedling stage. The effects of 1-naphthaleneacetic acid (NAA) treatment on seedling development were also analyzed under 0.05 μmol·L -1 NAA for 7 d.【Result】The target site sequence was designed based on the sequence of exon1 of OsPIN9 and, subsequently, the OsPIN9 genome editing recombinant vector was constructed. A total of 18 independent transgenic lines were obtained by transformation. Sequencing analysis revealed that three different mutation types were present in 7 T0 generation lines, including 3 lines with T insertion, 3 lines with G insertion and 1 line with C insertion, and all the mutation sites happened at the 18 th base of the target sequence. Two homozygous mutation lines were further identified in the T1 generation. BLAST analysis showed that the two types of OsPIN9 mutations caused frame-shift mutation and premature termination of translation, and the mutation protein was shortened from 426 aa in WT to 172 aa, thus leading to the complete disappearance of the transmembrane helices. qPCR analysis indicated that the transcription abundance of OsPIN9 significantly decreased in ospin9 mutants compared with WT, OsPIN1a and OsPIN5b were up-regulated, while OsPIN5a was down-regulated in ospin9 mutants. Both the shoot height and the number of adventitious roots of ospin9 mutants were reduced significantly than that of WT, while its root length was comparable to that of WT. The plant growth was inhibited and the adventitious root number was still less than that of WT under NAA treatment, but no significant difference was found between ospin9 mutants and WT plants. 【Conclusion】 Auxin efflux carrier OsPIN9 was directionally edited by using CRISPR/Cas9 technology, and two transgene-free homozygous ospin9 mutants were obtained. The mutation of OsPIN9 affected the expression level of other OsPINs genes, the shoot and root development were inhibited in ospin9 mutants at the seedling stage and NAA treatment partially rescued the development of adventitious roots in ospin9 mutants. Keywords:rice;OsPIN9;polar auxin transport;CRISPR/Cas9
PDF (2333KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 吴世洋, 杨晓祎, 张艳雯, 侯典云, 胥华伟. 利用CRISPR/Cas9基因编辑技术构建水稻ospin9突变体. 中国农业科学, 2021, 54(18): 3805-3817 doi:10.3864/j.issn.0578-1752.2021.18.002 WU ShiYang, YANG XiaoYi, ZHANG YanWen, HOU DianYun, XU HuaWei. Generation of ospin9 Mutants in Rice by CRISPR/Cas9 Genome Editing Technology. Scientia Acricultura Sinica, 2021, 54(18): 3805-3817 doi:10.3864/j.issn.0578-1752.2021.18.002
以MEGA7进行蛋白序列比对[45],比对结果进一步通过Jalview进行修饰[46]。通过在线网站(TMHMM Server v. 2.0: http://www.cbs.dtu.dk/services/TMHMM/)分析蛋白的跨膜螺旋结构域[47]。通过SWISS MODEL网站(https://swissmodel.expasy.org/)预测蛋白三级结构[48]。
OsPIN9主要在根及根茎结合部表达,此外,水稻根中还检测到OsPIN1a、OsPIN1b、OsPIN1c、OsPIN2、OsPIN5a和OsPIN5b的表达[20],以14 d幼苗根为材料对目的基因及根中OsPINs进行qRT-PCR表达分析。用RNAiso Plus(TaKaRa BIO INC)提取总RNA,运用HiScript III RT SuperMix for qPCR(+gDNA wiper)(南京诺唯赞生物科技股份有限公司)反转录得到cDNA。使用AceQ Universal SYBR qPCR Master Mix(南京诺唯赞生物科技股份有限公司)在Lightcycle® 96 qPCR仪上进行qRT-PCR分析,以水稻OsACTIN1(Os03g0718100)作为内参,以2-ΔΔCT法计算基因的相对表达量。试验进行3次生物学重复,每次3个技术重复。所用引物见表1。
A:幼苗期ospin9突变体照片;B:表型数据统计分析(n≥14)。黑色圆点表示测量值;**表示P<0.01水平差异;***表示P<0.001水平差异。下同 Fig. 7Phenotype of ospin9 mutants at the seedling stage
A: Photograph of ospin9 mutants at the seedling stage; B: Statistical analysis of the phenotypic data (n≥14). Black dot indicates measured data; * indicates difference at the P<0.01 level; *** indicates difference at the P<0.001 level. The same as below
A、B:对照植株株高及不定根数统计(n=12);C:0.05 μmol·L-1 NAA处理7 d株高和不定根数统计(n=12)。*表示P<0.05水平差异 Fig. 8Effects of NAA treatment on seedling shoot height and adventitious root number
A, B: Statistical analysis of shoot height and adventitious root number in untreated plants (n=12); C: Statistical analysis of shoot height and adventitious root number under 0.05 μmol·L-1 NAA treated for 7 d (n=12). * indicates difference at the P<0.05 level
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