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HSP101-encoding NEO-TETRAPLOID RICE FERTILITY GENE 1 regulates tapetum development through interaction with SAPK2 in

Lichong Cao1,2,3, Weicong Huang1,2,3, Hang Yu1,2,3,4

  • 1State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, 510642, China.

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Summary
This summary is machine-generated.

A novel gene, NTRF1, regulates fertility in polyploid rice by maintaining reactive oxygen species (ROS) balance and programmed cell death (PCD) in anthers, crucial for pollen development and seed setting.

Keywords:
NTRF1abscisic acidneo‐tetraploid ricepollen developmentprogrammed cell deathreactive oxygen speciesrice (Oryza sativa L.)

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Area of Science:

  • Plant Biology
  • Genetics
  • Molecular Biology

Background:

  • Heat shock protein 101 variants regulate fertility in neo-tetraploid rice (NTR).
  • The specific regulatory mechanism of NTRF1 in NTR fertility is not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanism by which NTRF1 regulates fertility in neo-tetraploid rice.
  • To identify the genetic and molecular factors involved in NTRF1-mediated fertility control.

Main Methods:

  • Identification and analysis of the ntrf1 mutant in neo-tetraploid rice.
  • RNA-sequencing (RNA-seq) to analyze gene expression in mutant anthers.
  • Multi-omics analysis and protein interaction assays.
  • Abscisic acid (ABA) treatment to assess rescue effects.

Main Results:

  • The ntrf1 mutant exhibits reduced seed-setting rates due to pollen developmental defects.
  • NTRF1 deficiency disrupts anther reactive oxygen species (ROS) homeostasis, delaying tapetal programmed cell death (PCD).
  • Dysregulated expression of ABA signaling components, ROS-related genes, and tapetal developmental regulators were observed in the ntrf1 mutant.
  • NTRF1 interacts with SAPK2, a kinase in ABA signaling, and ABA application partially rescues the fertility defect.

Conclusions:

  • NTRF1 is essential for coordinating ABA signaling and ROS homeostasis to ensure proper tapetal PCD and pollen maturation in polyploid rice.
  • The findings reveal an NTRF1-centered regulatory network critical for fertility.
  • This study offers potential molecular targets for improving polyploid rice genetics and yield.