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The transcription factor CAMTA2 interacts with the histone acetyltransferase GCN5 and regulates grain weight in wheat.

Author information

Affiliations

  • 1. Frontiers Science Center for Molecular Design Breeding, Key Laboratory of Crop Heterosis and Utilization (MOE), and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
      Authors
    • Zhang R 1
    • An K 1
    • Zhang Z 1
    • Zhang X 1
    • Zhang X 1
    • Xin M 1
    • Du J 1
    • Hu Z 1
    • Liu J 1
    • Peng H 1
    • Ni Z 1
    • Sun Q 1
    • Yao Y 1
    (13 authors)
  • 2. Agricultural College of Yangzhou University, Yangzhou 225009, China.
      Authors
    • Gao Y 2
    (1 author)
  • 3. Council for Agricultural Research and Economics, Research Centre for Cereal and Industrial Crops, I-24126, Bergamo, Italy.
      Authors
    • Rossi V 3
    (1 author)
  • 4. Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
      Authors
    • Cao Y 4
    • Xiao J 4
    (2 authors)

ORCIDs linked to this article

Show all (17)

The Plant Cell, 25 Sep 2024, :koae261
https://doi.org/10.1093/plcell/koae261 PMID: 39321218 

Abstract 

Grain weight and size are major traits targeted in breeding to improve wheat (Triticum aestivum L.) yield. Here, we find that the histone acetyltransferase GENERAL CONTROL NONDEREPRESSIBLE 5 (GCN5) physically interacts with the calmodulin-binding transcription factor CAMTA2 and regulates wheat grain size and weight. gcn5 mutant grains were smaller and contained less starch. GCN5 promoted the expression of the starch biosynthesis genes SUCROSE SYNTHASE 2 (Sus2) and STARCH-BRANCHING ENZYME Ic (SBEIc) by regulating H3K9ac and H3K14ac levels in their promoters. Moreover, immunoprecipitation followed by mass spectrometry (IP-MS) revealed that CAMTA2 physically interacts with GCN5. The CAMTA2-GCN5 complex activated Sus2 and SBEIc by directly binding to their promoters and depositing H3K9ac and H3K14ac marks during wheat endosperm development. camta2 knockout mutants exhibited similar phenotypes to gcn5 mutants, including smaller grains that contained less starch. In gcn5 mutants, transcripts of high molecular weight (HMW) Glutenin (Glu) genes were downregulated, leading to reduced HMW glutenin protein levels, gluten content, and sodium dodecyl sulfate (SDS) sedimentation volume. However, the association of GCN5 with Glu genes was independent of CAMTA2, since GCN5 enrichment on Glu promoters was unchanged in camta2 knockouts. Finally, we identified a CAMTA2-AH3 elite allele that corresponded with enhanced grain size and weight, serving as a candidate gene for breeding wheat varieties with improved grain weight.

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Read article at publisher's site: https://doi.org/10.1093/plcell/koae261

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Funding 

Funders who supported this work.

Biological Breeding-National Science and Technology Major Project (1)

Major Program of National Agricultural Science and Technology of China (1)

National Key Research and Development Program of China (1)

National Natural Science Foundation of China (2)

Pinduoduo-China Agricultural University Research Fund (1)

Science and Technology Planning Project of Sichuan Province (1)