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Related Experiment Video

Updated: Dec 5, 2025

A Simple Method for Isolation of Soybean Protoplasts and Application to Transient Gene Expression Analyses
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A Pd1-Ps-P1 Feedback Loop Controls Pubescence Density in Soybean.

Shulin Liu1, Lei Fan1, Zhi Liu1

  • 1State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100101, China; College of Advanced Agriculture Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.

Molecular Plant
|October 16, 2020
PubMed
Summary

Soybean pubescence density is regulated by a feedback loop involving three genes: Pd1 (dense), Ps (sparse), and P1 (glabrous). These genes interact to control trichome development and plant traits.

Keywords:
P1Pd1Psfeedback looppubescence densitysoybean

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Area of Science:

  • Plant biology
  • Genetics
  • Molecular biology

Background:

  • Trichomes (plant hairs) are crucial for traits like insect resistance and yield.
  • Soybean pubescence density has been linked to agronomic traits, with three alleles (Pd1, Ps, P1) identified historically.
  • The molecular basis and genetic interactions of these soybean pubescence alleles were previously unknown.

Purpose of the Study:

  • To determine the genetic basis of dense (Pd1), sparse (Ps), and glabrous (P1) pubescence in soybean.
  • To elucidate the molecular mechanisms and genetic relationships governing trichome development in soybean.

Main Methods:

  • Genome-wide association study (GWAS)
  • Map-based cloning
  • Genetic and biochemical analyses

Main Results:

  • Sparse pubescence (Ps) is caused by a copy-number variation in a WD40-RING domain gene.
  • Dense pubescence (Pd1) results from a mutation in an HD-Zip transcription factor gene.
  • Glabrousness (P1) is due to a mutation in a lipid transfer protein gene.
  • Pd1 acts as a transcriptional activator for P1 and Ps, and autoregulates its own expression.
  • Ps interacts with Pd1, reducing its transcriptional activity.

Conclusions:

  • Pd1, Ps, and P1 form a complex regulatory feedback loop controlling soybean pubescence.
  • This genetic network provides a molecular framework for understanding trichome development and its impact on agronomic traits.