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The WEEP gene mutation causes weeping peach trees by altering auxin transport, affecting cell elongation and tension wood. This gene

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Area of Science:

  • Plant biology
  • Genetics
  • Biochemistry

Background:

  • The weeping phenotype in peach (Prunus persica) is linked to a mutation in the WEEP gene, but its function remained unclear.
  • Understanding plant posture control and gravitropism is crucial for plant science.

Approach:

  • Conducted anatomical, biochemical, biomechanical, physiological, and molecular experiments on weeping and standard peach trees.
  • Analyzed transcriptomes from shoot tips to identify gene expression differences.
  • Utilized size-exclusion chromatography to investigate WEEP protein behavior.

Key Points:

  • WEEP protein influences polar auxin transport towards the lower side of shoots during gravitropism.
  • This leads to differential cell elongation and tension wood formation, causing downward arching branches.
  • Weeping peach trees show altered root gravitropism, similar to wheat and barley with WEEP homolog mutations.
  • WEEP proteins self-oligomerize, suggesting a role in protein complex formation for auxin transport.

Conclusions:

  • WEEP is essential for regulating shoot and root orientation during gravitropism.
  • The findings provide new insights into auxin transport mechanisms and plant posture control.
  • The conserved role of WEEP highlights its importance across different plant species.