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OsMT2b Regulates Pollen Development and ROS Homeostasis in a Photoperiod-Dependent Manner.

Ying He1, Can Wang1, Zilong Luo1

  • 1Guangdong Basic Research Center of Excellence for Precise Breeding of Future Crop, College of Life Sciences, South China Agricultural University, Guangzhou, China.

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Summary
This summary is machine-generated.

Reduced metallothionein OsMT2b in rice anthers increases reactive oxygen species (ROS), causing abnormal cell death and sterility. This OsMT2b gene integrates photoperiod signals for proper pollen development.

Keywords:
anthermetallothioneinphotoperiod‐sensitive genic male sterilityreactive oxygen speciestapetum

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Area of Science:

  • Plant Molecular Biology
  • Plant Reproduction Biology
  • Agricultural Science

Background:

  • Reactive oxygen species (ROS) are crucial signaling molecules involved in programmed cell death.
  • The specific role of ROS in rice anther development remains largely unexplored.

Purpose of the Study:

  • To investigate the function of the metallothionein gene OsMT2b in rice (Oryza sativa L.) anther development.
  • To elucidate the involvement of ROS in OsMT2b-mediated anther development and fertility.

Main Methods:

  • RNA interference (RNAi) was used to reduce OsMT2b transcript levels in japonica rice.
  • Anther development was analyzed using semi-thin sectioning and TUNEL assays.
  • ROS levels were quantified using Nitroblue tetrazolium staining and hydrogen peroxide measurements.

Main Results:

  • Downregulation of OsMT2b led to significantly reduced seed setting rates.
  • OsMT2b-RNAi anthers exhibited altered tapetum degradation timing and elevated ROS levels.
  • Abnormal tapetum programmed cell death in OsMT2b-RNAi plants resulted in sterile microspores.
  • OsMT2b-RNAi plants showed photoperiod sensitivity, with sterility under long-day and fertility under short-day conditions.

Conclusions:

  • OsMT2b plays a critical role in rice anther development by regulating ROS levels and programmed cell death.
  • OsMT2b integrates photoperiod information, influencing pollen development and fertility.
  • This OsMT2b-RNAi rice material offers potential as a valuable germplasm resource for two-line hybrid rice breeding.