Plant Physiology Preview
Published on October 27, 2006; 10.1104/pp.106.090381
OPEN ACCESS ARTICLE
Received September 26, 2006
Accepted October 17, 2006
Tie-dyed1 Regulates Carbohydrate Accumulation in Maize Leaves
David M. Braun *, Yi Ma , Noriko Inada , Michael G. Muszynski , and R. Frank Baker
Department of Biology, Pennsylvania State University, University Park, PA 16802
Department of Plant & Microbial Biology, University of California-Berkeley
Department of Agronomic Traits, Pioneer Hi-Bred International, Inc., Johnston, IA 50131
* Corresponding author; email: dbraun{at}psu.edu.
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), that 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, while green sectors appear unaffected. Significantly, starch accumulation precedes chlorosis in cells that will become a yellow sector. The 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.
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