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The bZIP transcription factor ZmbZIP39 coordinates maize grain filling by regulating photosynthesis, sucrose transport, and nutrient storage. This key regulator synchronizes source, flow, and sink processes for efficient crop yield.

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Area of Science:

  • Plant Biology
  • Molecular Genetics
  • Agricultural Science

Background:

  • Efficient grain filling in maize relies on coordinated source, flow, and sink processes.
  • The regulatory network governing these processes is not fully understood.
  • Sucrose transporter ZmSUT1 is crucial for phloem loading and unloading.

Purpose of the Study:

  • To identify key regulators of maize grain filling.
  • To elucidate the role of ZmbZIP39 in coordinating source-flow-sink relationships.

Main Methods:

  • Utilized ZmSUT1 as a molecular target to identify regulators.
  • Investigated the transcriptional regulation of photosynthesis, sucrose transport, and metabolism genes.
  • Analyzed the interaction of ZmbZIP39 with other regulatory factors.

Main Results:

  • Identified ZmbZIP39 as a central coordinator of grain filling.
  • ZmbZIP39 directly activates ZmSUT1 and ZmSUT7 for sucrose transport.
  • ZmbZIP39 upregulates sucrose synthase genes and zein-encoding genes for nutrient storage.
  • ZmbZIP39 forms a regulatory complex and exhibits autoactivation, creating a positive feedback loop.

Conclusions:

  • ZmbZIP39 is a pivotal transcription factor regulating source-flow-sink dynamics in maize.
  • Understanding ZmbZIP39's role provides insights into improving crop yield and nutrient content.