Control of phyllotaxy by the cytokinin-inducible response regulator homologue ABPHYL1

Anna Giulini, Jing Wang and David Jackson ()
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Anna Giulini: Cold Spring Harbor Laboratory
Jing Wang: Cold Spring Harbor Laboratory
David Jackson: Cold Spring Harbor Laboratory

Nature, 2004, vol. 430, issue 7003, 1031-1034

Abstract: Abstract Phyllotaxy describes the geometric pattern of leaves and flowers, and has intrigued botanists and mathematicians for centuries1,2. How these patterns are initiated is poorly understood, and this is partly due to the paucity of mutants3. Signalling by the plant hormone auxin appears to determine the site of leaf initiation; however, this observation does not explain how distinct patterns of phyllotaxy are initiated4. abphyl1 (abph1) mutants of maize initiate leaves in a decussate pattern (that is, paired at 180°), in contrast to the alternating or distichous phyllotaxy observed in wild-type maize and other grasses5. Here we show that ABPH1 is homologous to two-component response regulators and is induced by the plant hormone cytokinin. ABPH1 is expressed in the embryonic shoot apical meristem, and its spatial expression pattern changes rapidly with cytokinin treatment. We propose that ABPH1 controls phyllotactic patterning by negatively regulating the cytokinin-induced expansion of the shoot meristem, thereby limiting the space available for primordium initiation at the apex.

Date: 2004
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DOI: 10.1038/nature02778

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