articleThe Plant JournalNov 21, 2003BRONZE OA

Expression of cytokinin biosynthetic isopentenyltransferase genes in Arabidopsis : tissue specificity and regulation by auxin, cytokinin, and nitrate

KMKaori MiyawakiMMMiho Matsumoto‐KitanoTKTatsuo Kakimoto

The University of Osaka · Japan Science and Technology Agency

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Abstract

The rate-limiting step of cytokinin biosynthesis in Arabidopsis thaliana Heynh. is catalyzed by ATP/ADP isopentenyltransferases, A. thaliana IsoPentenyl Transferase (AtIPT)1, and AtIPT4, and by their homologs AtIPT3, AtIPT5, AtIPT6, AtIPT7, and AtIPT8. To understand the dynamics of cytokinins in plant development, we comprehensively analyzed the expression of isopentenyltransferase genes of Arabidopsis. Examination of their mRNA levels and the expression patterns of the beta-glucuronidase (GUS) gene fused to the regulatory sequence of each AtIPT gene revealed a specific expression pattern of each gene. The predominant expression patterns were as follows: AtIPT1::GUS, xylem precursor cell files in the root tip,…

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Topics & keywords

Topics
Keywords
  • Biology
  • Arabidopsis thaliana
  • Arabidopsis
  • Cytokinin
  • Primordium
  • Auxin
  • GUS reporter system
  • Meristem
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