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LAX1, functioning with MADS-box genes, determines normal palea development in rice.

Erbao Liu1, Shangshang Zhu2, Mingyu Du1

  • 1College of Agriculture, Anhui Agricultural University, Hefei 230036, China.

Gene
|July 13, 2023
PubMed
Summary

Rice palea development is regulated by the LAX1 gene, a basic helix-loop-helix transcription factor. LAX1 interacts with MADS-box genes to maintain palea identity and influence other floral traits.

Keywords:
Functional analysisLax1-7MADS-box genesOryza sativaPalea length

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Area of Science:

  • Plant Biology
  • Genetics
  • Molecular Biology

Background:

  • Normal floral organ development in rice is crucial for grain formation.
  • MADS-box genes are key regulators of rice flower development, following the ABCDE model.
  • The LAX1 gene, encoding a basic helix-loop-helix (bHLH) transcription factor, is known to regulate axillary meristem formation in rice.

Purpose of the Study:

  • To investigate the molecular mechanisms of the LAX1 gene in rice palea development.
  • To identify and characterize new mutant alleles of LAX1.
  • To explore the interaction between LAX1 and MADS-box genes in regulating floral organ identity.

Main Methods:

  • Map-based cloning was used to identify the lax1-7 mutant allele.
  • Genetic and molecular biological analyses were performed to determine gene function.
  • In vitro and in vivo experiments were conducted to study protein interactions.

Main Results:

  • A new mutant allele, lax1-7, causing short palea in rice, was identified and cloned.
  • The wild-type LAX1 allele is specifically expressed in young rice spikelets and encodes a nucleus-localized protein.
  • LAX1 physically interacts with rice MADS-box proteins OsMADS1, OsMADS6, and OsMADS7.
  • LAX1 plays a pleiotropic role in maintaining rice palea identity and affects other traits like plant height and fertility.

Conclusions:

  • The LAX1 gene is essential for rice palea development and identity.
  • LAX1 functions in cooperation with MADS-box genes to regulate floral organ development.
  • LAX1 has multiple roles in rice plant architecture and reproductive traits.