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DEVELOPMENT AND HORMONE ACTION

tie-dyed1 Regulates Carbohydrate Accumulation in Maize Leaves^{1,[C],[W],[OA]}

Department of Biology, Pennsylvania State University, University Park, Pennsylvania 16802 (D.M.B., Y.M., R.F.B.); Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (N.I.); and Department of Agronomic Traits, Pioneer Hi-Bred International, Inc., Johnston, Iowa 50131 (M.G.M.)

Acquisition of cell identity requires communication among neighboring cells. To dissect the genetic pathways regulating cell signaling in later leaf development, a screen was performed to identify mutants with chloroplast pigmentation sectors that violate cell lineage boundaries in maize (Zea mays) leaves. We have characterized a recessive mutant, tie-dyed1 (tdy1), which develops stable, nonclonal variegated yellow and green leaf sectors. Sector formation requires high light, occurs during a limited developmental time, and is restricted to leaf blade tissue. Yellow tdy1 sectors accumulate excessive soluble sugars and starch, whereas green sectors appear unaffected. Significantly, starch accumulation precedes chlorosis in cells that will become a yellow sector. Retention of carbohydrates in tdy1 leaves is associated with a delay in reproductive maturity, decreased stature, and reduced yield. To explain the tdy1 sectoring pattern, we propose a threshold model that incorporates the light requirement and the hyperaccumulation of photoassimilates. A possible function consistent with this model is that TDY1 acts as a sugar sensor to regulate an inducible sugar export pathway as leaves develop under high light conditions.

² Present address: Nara Institute of Science and Technology, Plant Protein Biology, 8916–5, Takayama, Ikoma Nara 630–0101, Japan.

³ Present address: Syngenta Seeds, Inc., Slater, IA 50244.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: David M. Braun (dbraun{at}psu.edu).

^[C] Some figures in this article are displayed in color online but in black and white in the print edition.

^[W] The online version of this article contains Web-only data.

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www.plantphysiol.org/cgi/doi/10.1104/pp.106.090381

^* Corresponding author; e-mail dbraun{at}psu.edu; fax 814–865–9131.

Received September 26, 2006; accepted October 17, 2006; published October 27, 2006.

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