Innovations in Hybrid Rice Seed Production: Integrating Agronomy, Mechanization, and Biotechnology.

Area of Science:

• Agricultural Science
• Plant Breeding
• Food Security

Background:

• Current hybrid rice seed production systems (three-line and two-line) are labor-intensive and vulnerable to climate change.
• These limitations pose a significant bottleneck to the sustainability of global food security efforts.

Purpose of the Study:

• To systematically review recent advances in hybrid rice seed production.
• To propose a novel "dual-track" analytical framework to address current industry bottlenecks.
• To guide a strategic shift towards more sustainable and resilient seed production methods.

Main Methods:

• Proximal Track: Integration of agronomy and machinery, including mechanized planting, phenotypic sorting, selective herbicides, and gene editing (thermosensitive female sterility).
• Distal Track: Exploration of molecular breakthroughs, focusing on third-generation seed production technology (SPT) and "one-line" synthetic apomixis for heterosis fixation.
• Framework Development: Proposing tailored parental lines for mechanization and AI-driven models for genotype-by-environment risk prediction.

Main Results:

• Mechanized innovations in split- and mixed-planting models enhance efficiency.
• Third-generation SPT enables unrestricted crossing and large-scale propagation of male sterile lines.
• "One-line" synthetic apomixis shows potential for permanent heterosis fixation.

Conclusions:

• The proposed dual-track framework facilitates a paradigm shift from "Agronomic-mechanistic integration" to "Reproductive pathway rewiring."
• This research lays the foundation for transitioning from current hybrid rice systems to a more advanced "one-line" method.
• The framework aims to enhance the sustainability and climate resilience of global rice production.