Maize Inbred PH2RRS Breeding via Male Sterility Systems
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Solution Overview
Problem
The development of new maize varieties and hybrids is a time-consuming process, taking six to twelve years, and existing technologies face challenges in creating stable, high-yielding maize varieties with desirable traits such as disease resistance, drought tolerance, and improved agronomic characteristics.
Innovation Solution
The introduction of the novel maize variety PH2RRS, which involves crossing and genetic manipulation to incorporate traits like male sterility, disease resistance, and improved agronomic characteristics, using backcross conversion and genetic transformation techniques, and the production of hybrid seeds through controlled pollination processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional maize breeding processes are used to develop new varieties with desirable traits, then the varieties achieve stability and high yield, but the development time becomes excessively long (6-12 years)
Solution Approach 1:
The patent applies preliminary action by pre-selecting and characterizing inbred lines with specific desirable traits (disease resistance, drought tolerance, yield potential) before combining them. The inbred lines are pre-screened for agronomic characteristics, and male sterility systems are pre-established to facilitate controlled crossing, thereby reducing the overall breeding timeline while maintaining variety stability.
Solution Approach 2:
The patent uses male sterility systems (cytoplasmic male sterility, nuclear male sterility, or genetic male sterility) as intermediaries to control pollination and hybridization. This intermediary mechanism enables precise control over crossing events, allowing for efficient combination of desirable traits from different inbred lines without manual emasculation, thus accelerating the breeding process while ensuring genetic stability.
2Productivity
If multiple desirable traits are combined in a single maize variety, then the variety achieves maximal yield and agronomic soundness, but the breeding process complexity increases
Solution Approach 1:
The patent segments the breeding process into distinct components: separate inbred line development with specific traits, male sterility system establishment, controlled crossing, and hybrid evaluation. By segmenting the complex task of combining multiple traits into manageable modules, the patent reduces overall process complexity while achieving high-yielding varieties with multiple desirable characteristics.
Solution Approach 2:
The patent employs universal male sterility systems that can be applied across multiple inbred lines and breeding programs. The male sterility mechanism serves multiple functions: controlling pollination, ensuring hybrid purity, and facilitating mechanical or controlled crossing. This multi-functional approach simplifies the breeding process for combining multiple traits across different varieties.
3Productivity
If conventional crossing methods are used to produce hybrid seed, then the hybrid achieves heterosis and high yield, but the production process becomes time-consuming and labor-intensive
Solution Approach 1:
The patent applies self-service by utilizing the plant's own biological mechanisms for controlled pollination. Male sterile plants automatically prevent self-pollination, and when grown alongside pollen-donor plants, they naturally receive cross-pollination without manual intervention. This self-service approach to hybrid seed production eliminates labor-intensive manual emasculation and pollination steps, significantly reducing production time and labor requirements while maintaining hybrid vigor.
Data Source
AI summary
A novel maize variety designated PH2RRS and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH2RRS with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH2RRS through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby are provided. Hybrid maize seed, plants or plant parts are produced by crossing the variety PH2RRS or a locus conversion of PH2RRS with another maize variety.