ArabidopsisCytokinin Receptor Mutants Reveal Functions in Shoot Growth, Leaf Senescence, Seed Size, Germination, Root Development, and Cytokinin Metabolism

The analyses reveal partially redundant functions of the cytokinin receptors and prominent roles for the AHK2/ AHK3 receptor combination in quantitative control of organ growth in plants, with opposite regulatory functions in roots and shoots

Michael Riefler; Ondrej Novak; Miroslav Strnad; Thomas Schmülling


Scholarcy highlights

  • Cytokinin is a plant hormone that plays positive and negative regulatory roles in many aspects of plant growth and development
  • The initial isolation and characterization of cytokinin receptor mutants is illustrated in Supplemental Figures 1 and 2 online
  • The second isolated ahk3 mutant allele is identical to ahk3-3; it has an insertion in the sixth intron
  • We have undertaken a detailed loss-of-function mutant analysis to study the roles of three cytokinin receptors in development and their participation in a variety of cytokinin-dependent processes
  • One example is root branching, which was enhanced in all double mutants but strong in the ahk2 ahk3 combination
  • Comparisons will be made with previous reports on cytokinin receptor mutants, which analyzed some aspects of single mutants and specific combinations of multiple mutants
  • Ahk2 ahk3 receptor mutants phenocopy to a large extent cytokinin-deficient plants, providing substantial support for the concept of a function of cytokinin in positive control of shoot development and negative control of root growth

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