Biotechnology Bulletin ›› 2023, Vol. 39 ›› Issue (9): 126-135.doi: 10.13560/j.cnki.biotech.bull.1985.2023-0001

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Construction of Yeast One-hybrid Library and Screening of Factors Regulating LAZY1 Expression in Rice

HUANG Xiao-long1,2,3(), SUN Gui-lian1,2,3, MA Dan-dan1,2,3, YAN Hui-qing1()   

  1. 1. School of Life Science, Guizhou Normal University, Guiyang 550025
    2. Key Laboratory of Plant Physiology and Development, Guiyang 550025
    3. Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Karst Mountainous Areas of Southwestern China, Guiyang 550025
  • Received:2023-01-04 Online:2023-09-26 Published:2023-10-24
  • Contact: YAN Hui-qing E-mail:hxl2014gznu@126.com;yanhuiqing@gznu.edu.cn

Abstract:

LAZY1 regulates rice tiller angle by promoting the lateral auxin transport to grow erectly in rice, thereby increasing its production. To explore the molecular regulatory mechanism of LAZY1 expression, a yeast one-hybrid library screening system was used to screen the upstream regulated factors of LAZY1. Firstly, the genome DNA of Nipponbare and amplified the promoter sequences of LAZY1 were extracted. Then, this fragment was ligated into the pHIS2 bait vector and transformed into Saccharomyces cerevisiae AH109 to obtain pHIS2-LAZY1 bait yeast. Meanwhile, a cDNA library of 3 DAG seeding of Nipponbare was constructed by SMART technology. Then, the purified cDNA library was co-transformed into S. cerevisiae Y187 with pGADT7-Rec vector. The candidate transcription factors of LAZY1 were identified by mating bait yeast and library yeast. A total of 21 cDNA sequences were determined. Finally, the dual-luciferase transient assay showed that the transcription factor multiprotein-bridging factor(OsMBF1)activated the transcription of LAZY1 in vivo. In this study, more positive regulators of LAZY1 were identified, which will provide a theoretical basis for uncovering the network of auxin polar transport mediated by LAZY1 and tiller angle determination, and revealing the mystery of plant architecture from prostrate to erect.

Key words: Oryza sativa, LAZY1, yeast one-hybrid(Y1H)screening, transcription factor