Biotechnology Bulletin ›› 2025, Vol. 41 ›› Issue (3): 83-89.doi: 10.13560/j.cnki.biotech.bull.1985.2024-0813

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Reducing the Expression of GBSSI Gene in Barley via the Editing in the 5′UTR Region

XUE Rui-ying1,2(), LIU Yong-ju1,2, JIANG Yan-yan2,3, PENG Xin-ya1,2, CAO Dong1,3, LI Yun2(), LIU Bao-long1,2,3(), BAO Xue-mei1()   

  1. 1.School of Life Sciences, Qinghai Normal University, Xining 810008
    2.Qinghai Provincial Key Laboratory of Crop Molecular Breeding, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008
    3.Academy of Agriculture and Forestry Sciences, Qinghai University, Xining 810008
  • Received:2024-08-23 Online:2025-03-26 Published:2025-03-20
  • Contact: LI Yun, LIU Bao-long, BAO Xue-mei E-mail:xry198@foxmail.com;liyun@nwipb.cas.cn;baoxuemei1991@163.com

Abstract:

Objective Barley is the fourth largest grain crop. The total starch content and the ratio of amylose and amylopectin in the grain are the key factors to determine the quality and characteristics of barley. The fine control of amylose content is of great significance for the improvement of barley flour quality. Method In this study, barley Cas9 overexpression lines were used as receptors, and the 5′non-coding region (5′ UTR) of GBSSI gene was targeted by BSMV-SG-mediated gene editing system to achieve the fine regulation of GBSSI gene expression. Result Our results indicated that somatic editing occurred in the leaves of the fifth tiller from 14 M0 generation 5′UTR plants, with an editing efficiency ranging from 1.22% to 84.49%. Seeds from the fifth tiller exhibiting peak editing efficiency were harvested, leading to identification of six edited lines among twenty-three M1 generation plants, resulting in an edited plant proportion of 26.08%. RT-qPCR analysis revealed a reduction in GBSSI gene expression by 40%–82% compared to controls. Conclusion These findings demonstrate that GBSSI gene expression can be effectively regulated through modification of its 5′UTR region, providing novel insights into precise regulation mechanisms for amylose synthesis.

Key words: gene editing, BSMV-sg system, 5′UTR, GBSSI gene, expression regulation, barley