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Related Experiment Video

Updated: Oct 12, 2025

Determination of Self-Incompatibility and Inter-Incompatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses
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Polyamines Involved in Regulating Self-Incompatibility in Apple.

Jie Yu1, Baoan Wang1, Wenqi Fan1

  • 1College of Horticulture, China Agricultural University, Beijing 100193, China.

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|November 27, 2021
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Summary

Apple pollen tube polyamines help defend against self-S-RNase toxicity, a key factor in self-incompatibility. This study reveals polyamines enhance pollen tube tolerance to S-RNase, offering strategies to overcome apple self-incompatibility.

Keywords:
S-RNaseapplepollen tubepolyaminesself-incompatibility

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Area of Science:

  • Plant reproductive biology
  • Molecular genetics
  • Biochemistry

Background:

  • Apple self-incompatibility involves S-RNase inhibiting pollen tube growth.
  • Limited understanding exists on mechanisms resisting self-S-RNase toxicity.

Purpose of the Study:

  • Investigate the role of pollen tube polyamines in apple self-incompatibility.
  • Determine how polyamines influence pollen tube response to self-S-RNase.

Main Methods:

  • Analysis of polyamine content under self-S-RNase treatment.
  • Gene expression analysis of polyamine metabolic enzymes.
  • Gene silencing of MdPAO6 in pollen tubes.
  • Exogenous polyamine application.
  • Transcriptome sequencing.

Main Results:

  • Polyamines (putrescine, spermidine, spermine) decreased under self-S-RNase.
  • Expression of MdDAO4, MdPAO3, MdPAO4, and MdPAO6 increased, reducing polyamines.
  • Silencing MdPAO6 improved pollen tube tolerance to self-S-RNase.
  • Exogenous polyamines enhanced pollen tube resistance to self-S-RNase.
  • Polyamines may interact with S-RNase via calcium signaling.

Conclusions:

  • Polyamines are crucial in the apple self-incompatibility response.
  • Polyamines enhance pollen tube tolerance to S-RNase.
  • Polyamines represent a potential target for breaking self-incompatibility in apples.