Cell dedifferentiation and organogenesis in vitro require more snRNA than does seedling development in Arabidopsis thaliana

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• 作者：Misato Ohtani ; Arika Takebayashi ; Ryoko Hiroyama ; Bo Xu…
• 关键词：Cell dedifferentiation ; Organogenesis in vitro ; snRNA ; SRD2
• 刊名：Journal of Plant Research
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：128
• 期：3
• 页码：371-380
• 全文大小：2,096 KB
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• 作者单位：Misato Ohtani (1) (2)
  Arika Takebayashi (2)
  Ryoko Hiroyama (2)
  Bo Xu (1)
  Toru Kudo (3)
  Hitoshi Sakakibara (3)
  Munetaka Sugiyama (4)
  Taku Demura (1) (2)
  
  1. Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara, 630-0192, Japan
  2. Biomass Engineering Program Cooperation Division, RIKEN Center for Sustainable Resource Science, Yokohama, 230-0045, Japan
  3. RIKEN Plant Science Center, Yokohama, 230-0045, Japan
  4. Botanical Gardens, Graduate School of Science, University of Tokyo, Tokyo, 112-001, Japan
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Plant Ecology
  Plant Physiology
  Plant Biochemistry
  
• 出版者：Springer Japan
• ISSN：1618-0860

文摘

Small nuclear RNA (snRNA) is a class of non-coding RNAs that processes pre-mRNA and rRNA. Transcription of abundant snRNA species is regulated by the snRNA activating protein complex (SNAPc), which is conserved among multicellular organisms including plants. SRD2, a putative subunit of SNAPc in Arabidopsis thaliana, is essential for development, and the point mutation srd2-1 causes severe defects in hypocotyl dedifferentiation and de novo meristem formation. Based on phenotypic analysis of srd2-1 mutant plants, we previously proposed that snRNA content is a limiting factor in dedifferentiation in plant cells. Here, we performed functional complementation analysis of srd2-1 using transgenic srd2-1 Arabidopsis plants harboring SRD2 homologs from Populus trichocarpa (poplar), Nicotiana tabacum (tobacco), Oryza sativa (rice), the moss Physcomitrella patens, and Homo sapiens (human) under the control of the Arabidopsis SRD2 promoter. Only rice SRD2 suppressed the faulty tissue culture responses of srd2-1, and restore the snRNA levels; however, interestingly, all SRD2 homologs except poplar SRD2 rescued the srd2-1 defects in seedling development. These findings demonstrated that cell dedifferentiation and organogenesis induced during tissue culture require higher snRNA levels than does seedling development.