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Precise tiller angle control by manipulating TAC1 expression in rice.

Tao Yin1, Yuxin Tai1, Yao Sun1,2

  • 1State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.

Journal of Integrative Plant Biology
|March 7, 2025
PubMed
Summary
This summary is machine-generated.

Researchers precisely manipulated rice tiller angles by fine-tuning TILLER ANGLE CONTROL1 (TAC1) gene expression. This innovation offers a method to optimize plant architecture for breeding, adaptable to various climates and species.

Keywords:
TAC1genome editingplant architecturericetiller angle

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Area of Science:

  • Plant genetics
  • Crop science
  • Agricultural biotechnology

Background:

  • Tiller angle is a key plant architecture trait influencing crop yield and disease susceptibility.
  • Optimizing tiller angle is crucial for high-density planting and managing microclimates in agriculture.
  • Precise genetic control of tiller angle has been a significant challenge in plant breeding.

Purpose of the Study:

  • To develop a method for precisely controlling tiller angle in indica rice.
  • To investigate the role of TILLER ANGLE CONTROL1 (TAC1) in regulating tiller angle.
  • To assess the impact of TAC1 expression manipulation on other agronomic traits and its broader applicability.

Main Methods:

  • Utilized multiplex CRISPR-Cas9 technology to edit regulatory regions of the TAC1 gene in rice.
  • Generated homozygous allelic lines with various deletions/inversions to create gradient changes in TAC1 expression.
  • Analyzed the correlation between TAC1 expression levels and tiller angle variations.
  • Evaluated the effects of TAC1 manipulation on other essential agronomic traits.

Main Results:

  • Successfully created indica rice lines with smooth gradient changes in tiller angle.
  • Demonstrated a direct correlation between TAC1 expression levels and tiller angle.
  • Confirmed that TAC1 expression adjustments did not negatively affect other examined agronomic traits.
  • Identified TAC1 conservation across species, with ortholog mutations causing altered plant architecture.

Conclusions:

  • Fine-tuning TAC1 expression provides a precise tool for manipulating tiller angle and plant architecture in rice.
  • This approach offers a valuable strategy for rice breeding programs to adapt plant types to specific climates.
  • The method is potentially extensible to other plant species for improving architectural traits and crop management.