The expression domain of PHANTASTICA determines leaflet placement in compound leaves

Minsung Kim, Sheila McCormick, Marja Timmermans and Neelima Sinha ()
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Minsung Kim: University of California at Davis
Sheila McCormick: Plant Gene Expression Center, USDA/ARS and UC-Berkeley
Marja Timmermans: Cold Spring Harbor Laboratory, Plant Genetics
Neelima Sinha: University of California at Davis

Nature, 2003, vol. 424, issue 6947, 438-443

Abstract: Abstract Diverse leaf forms in nature can be categorized as simple or compound. Simple leaves, such as those of petunia, have a single unit of blade, whereas compound leaves, such as those of tomato, have several units of blades called leaflets. Compound leaves can be pinnate, with leaflets arranged in succession on a rachis, or palmate, with leaflets clustered together at the leaf tip. The mechanisms that generate these various leaf forms are largely unknown. The upper (adaxial) surface is usually different from the bottom (abaxial) surface in both simple and compound leaves. In species with simple leaves, the specification of adaxial and abaxial cells is important for formation of the leaf blade1,2, and the MYB transcription factor gene PHANTASTICA (PHAN) is involved in maintaining the leaf adaxial (upper) domain3,4. Here we show that downregulation of PHAN is sufficient to reduce the adaxial domain of leaf primordia and to change pinnate compound leaves into palmate compound leaves. Furthermore, this mechanism seems to be shared among compound leaves that arose independently.

Date: 2003
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DOI: 10.1038/nature01820

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